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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: error out earlier on disconnect\n\nEric reported a division by zero splat in the MPTCP protocol:\n\nOops: divide error: 0000 [#1] PREEMPT SMP KASAN PTI\nCPU: 1 UID: 0 PID: 6094 Comm: syz-executor317 Not tainted\n6.12.0-rc5-syzkaller-00291-g05b92660cdfe #0\nHardware name: Google Google Compute Engine/Google Compute Engine,\nBIOS Google 09/13/2024\nRIP: 0010:__tcp_select_window+0x5b4/0x1310 net/ipv4/tcp_output.c:3163\nCode: f6 44 01 e3 89 df e8 9b 75 09 f8 44 39 f3 0f 8d 11 ff ff ff e8\n0d 74 09 f8 45 89 f4 e9 04 ff ff ff e8 00 74 09 f8 44 89 f0 99 \u003cf7\u003e 7c\n24 14 41 29 d6 45 89 f4 e9 ec fe ff ff e8 e8 73 09 f8 48 89\nRSP: 0018:ffffc900041f7930 EFLAGS: 00010293\nRAX: 0000000000017e67 RBX: 0000000000017e67 RCX: ffffffff8983314b\nRDX: 0000000000000000 RSI: ffffffff898331b0 RDI: 0000000000000004\nRBP: 00000000005d6000 R08: 0000000000000004 R09: 0000000000017e67\nR10: 0000000000003e80 R11: 0000000000000000 R12: 0000000000003e80\nR13: ffff888031d9b440 R14: 0000000000017e67 R15: 00000000002eb000\nFS: 00007feb5d7f16c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007feb5d8adbb8 CR3: 0000000074e4c000 CR4: 00000000003526f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n\u003cTASK\u003e\n__tcp_cleanup_rbuf+0x3e7/0x4b0 net/ipv4/tcp.c:1493\nmptcp_rcv_space_adjust net/mptcp/protocol.c:2085 [inline]\nmptcp_recvmsg+0x2156/0x2600 net/mptcp/protocol.c:2289\ninet_recvmsg+0x469/0x6a0 net/ipv4/af_inet.c:885\nsock_recvmsg_nosec net/socket.c:1051 [inline]\nsock_recvmsg+0x1b2/0x250 net/socket.c:1073\n__sys_recvfrom+0x1a5/0x2e0 net/socket.c:2265\n__do_sys_recvfrom net/socket.c:2283 [inline]\n__se_sys_recvfrom net/socket.c:2279 [inline]\n__x64_sys_recvfrom+0xe0/0x1c0 net/socket.c:2279\ndo_syscall_x64 arch/x86/entry/common.c:52 [inline]\ndo_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83\nentry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7feb5d857559\nCode: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 48 89 f8 48\n89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 \u003c48\u003e 3d\n01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007feb5d7f1208 EFLAGS: 00000246 ORIG_RAX: 000000000000002d\nRAX: ffffffffffffffda RBX: 00007feb5d8e1318 RCX: 00007feb5d857559\nRDX: 000000800000000e RSI: 0000000000000000 RDI: 0000000000000003\nRBP: 00007feb5d8e1310 R08: 0000000000000000 R09: ffffffff81000000\nR10: 0000000000000100 R11: 0000000000000246 R12: 00007feb5d8e131c\nR13: 00007feb5d8ae074 R14: 000000800000000e R15: 00000000fffffdef\n\nand provided a nice reproducer.\n\nThe root cause is the current bad handling of racing disconnect.\nAfter the blamed commit below, sk_wait_data() can return (with\nerror) with the underlying socket disconnected and a zero rcv_mss.\n\nCatch the error and return without performing any additional\noperations on the current socket."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86: ISST: Fix the KASAN report slab-out-of-bounds bug\n\nAttaching SST PCI device to VM causes \"BUG: KASAN: slab-out-of-bounds\".\nkasan report:\n[   19.411889] ==================================================================\n[   19.413702] BUG: KASAN: slab-out-of-bounds in _isst_if_get_pci_dev+0x3d5/0x400 [isst_if_common]\n[   19.415634] Read of size 8 at addr ffff888829e65200 by task cpuhp/16/113\n[   19.417368]\n[   19.418627] CPU: 16 PID: 113 Comm: cpuhp/16 Tainted: G            E      6.9.0 #10\n[   19.420435] Hardware name: VMware, Inc. VMware20,1/440BX Desktop Reference Platform, BIOS VMW201.00V.20192059.B64.2207280713 07/28/2022\n[   19.422687] Call Trace:\n[   19.424091]  \u003cTASK\u003e\n[   19.425448]  dump_stack_lvl+0x5d/0x80\n[   19.426963]  ? _isst_if_get_pci_dev+0x3d5/0x400 [isst_if_common]\n[   19.428694]  print_report+0x19d/0x52e\n[   19.430206]  ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n[   19.431837]  ? _isst_if_get_pci_dev+0x3d5/0x400 [isst_if_common]\n[   19.433539]  kasan_report+0xf0/0x170\n[   19.435019]  ? _isst_if_get_pci_dev+0x3d5/0x400 [isst_if_common]\n[   19.436709]  _isst_if_get_pci_dev+0x3d5/0x400 [isst_if_common]\n[   19.438379]  ? __pfx_sched_clock_cpu+0x10/0x10\n[   19.439910]  isst_if_cpu_online+0x406/0x58f [isst_if_common]\n[   19.441573]  ? __pfx_isst_if_cpu_online+0x10/0x10 [isst_if_common]\n[   19.443263]  ? ttwu_queue_wakelist+0x2c1/0x360\n[   19.444797]  cpuhp_invoke_callback+0x221/0xec0\n[   19.446337]  cpuhp_thread_fun+0x21b/0x610\n[   19.447814]  ? __pfx_cpuhp_thread_fun+0x10/0x10\n[   19.449354]  smpboot_thread_fn+0x2e7/0x6e0\n[   19.450859]  ? __pfx_smpboot_thread_fn+0x10/0x10\n[   19.452405]  kthread+0x29c/0x350\n[   19.453817]  ? __pfx_kthread+0x10/0x10\n[   19.455253]  ret_from_fork+0x31/0x70\n[   19.456685]  ? __pfx_kthread+0x10/0x10\n[   19.458114]  ret_from_fork_asm+0x1a/0x30\n[   19.459573]  \u003c/TASK\u003e\n[   19.460853]\n[   19.462055] Allocated by task 1198:\n[   19.463410]  kasan_save_stack+0x30/0x50\n[   19.464788]  kasan_save_track+0x14/0x30\n[   19.466139]  __kasan_kmalloc+0xaa/0xb0\n[   19.467465]  __kmalloc+0x1cd/0x470\n[   19.468748]  isst_if_cdev_register+0x1da/0x350 [isst_if_common]\n[   19.470233]  isst_if_mbox_init+0x108/0xff0 [isst_if_mbox_msr]\n[   19.471670]  do_one_initcall+0xa4/0x380\n[   19.472903]  do_init_module+0x238/0x760\n[   19.474105]  load_module+0x5239/0x6f00\n[   19.475285]  init_module_from_file+0xd1/0x130\n[   19.476506]  idempotent_init_module+0x23b/0x650\n[   19.477725]  __x64_sys_finit_module+0xbe/0x130\n[   19.476506]  idempotent_init_module+0x23b/0x650\n[   19.477725]  __x64_sys_finit_module+0xbe/0x130\n[   19.478920]  do_syscall_64+0x82/0x160\n[   19.480036]  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[   19.481292]\n[   19.482205] The buggy address belongs to the object at ffff888829e65000\n which belongs to the cache kmalloc-512 of size 512\n[   19.484818] The buggy address is located 0 bytes to the right of\n allocated 512-byte region [ffff888829e65000, ffff888829e65200)\n[   19.487447]\n[   19.488328] The buggy address belongs to the physical page:\n[   19.489569] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888829e60c00 pfn:0x829e60\n[   19.491140] head: order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0\n[   19.492466] anon flags: 0x57ffffc0000840(slab|head|node=1|zone=2|lastcpupid=0x1fffff)\n[   19.493914] page_type: 0xffffffff()\n[   19.494988] raw: 0057ffffc0000840 ffff88810004cc80 0000000000000000 0000000000000001\n[   19.496451] raw: ffff888829e60c00 0000000080200018 00000001ffffffff 0000000000000000\n[   19.497906] head: 0057ffffc0000840 ffff88810004cc80 0000000000000000 0000000000000001\n[   19.499379] head: ffff888829e60c00 0000000080200018 00000001ffffffff 0000000000000000\n[   19.500844] head: 0057ffffc0000003 ffffea0020a79801 ffffea0020a79848 00000000ffffffff\n[   19.502316] head: 0000000800000000 0000000000000000 00000000ffffffff 0000000000000000\n[   19.503784] page dumped because: k\n---truncated---"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: Fix a data race on last_boosted_vcpu in kvm_vcpu_on_spin()\n\nUse {READ,WRITE}_ONCE() to access kvm-\u003elast_boosted_vcpu to ensure the\nloads and stores are atomic.  In the extremely unlikely scenario the\ncompiler tears the stores, it\u0027s theoretically possible for KVM to attempt\nto get a vCPU using an out-of-bounds index, e.g. if the write is split\ninto multiple 8-bit stores, and is paired with a 32-bit load on a VM with\n257 vCPUs:\n\n  CPU0                              CPU1\n  last_boosted_vcpu = 0xff;\n\n                                    (last_boosted_vcpu = 0x100)\n                                    last_boosted_vcpu[15:8] = 0x01;\n  i = (last_boosted_vcpu = 0x1ff)\n                                    last_boosted_vcpu[7:0] = 0x00;\n\n  vcpu = kvm-\u003evcpu_array[0x1ff];\n\nAs detected by KCSAN:\n\n  BUG: KCSAN: data-race in kvm_vcpu_on_spin [kvm] / kvm_vcpu_on_spin [kvm]\n\n  write to 0xffffc90025a92344 of 4 bytes by task 4340 on cpu 16:\n  kvm_vcpu_on_spin (arch/x86/kvm/../../../virt/kvm/kvm_main.c:4112) kvm\n  handle_pause (arch/x86/kvm/vmx/vmx.c:5929) kvm_intel\n  vmx_handle_exit (arch/x86/kvm/vmx/vmx.c:?\n\t\t arch/x86/kvm/vmx/vmx.c:6606) kvm_intel\n  vcpu_run (arch/x86/kvm/x86.c:11107 arch/x86/kvm/x86.c:11211) kvm\n  kvm_arch_vcpu_ioctl_run (arch/x86/kvm/x86.c:?) kvm\n  kvm_vcpu_ioctl (arch/x86/kvm/../../../virt/kvm/kvm_main.c:?) kvm\n  __se_sys_ioctl (fs/ioctl.c:52 fs/ioctl.c:904 fs/ioctl.c:890)\n  __x64_sys_ioctl (fs/ioctl.c:890)\n  x64_sys_call (arch/x86/entry/syscall_64.c:33)\n  do_syscall_64 (arch/x86/entry/common.c:?)\n  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\n  read to 0xffffc90025a92344 of 4 bytes by task 4342 on cpu 4:\n  kvm_vcpu_on_spin (arch/x86/kvm/../../../virt/kvm/kvm_main.c:4069) kvm\n  handle_pause (arch/x86/kvm/vmx/vmx.c:5929) kvm_intel\n  vmx_handle_exit (arch/x86/kvm/vmx/vmx.c:?\n\t\t\tarch/x86/kvm/vmx/vmx.c:6606) kvm_intel\n  vcpu_run (arch/x86/kvm/x86.c:11107 arch/x86/kvm/x86.c:11211) kvm\n  kvm_arch_vcpu_ioctl_run (arch/x86/kvm/x86.c:?) kvm\n  kvm_vcpu_ioctl (arch/x86/kvm/../../../virt/kvm/kvm_main.c:?) kvm\n  __se_sys_ioctl (fs/ioctl.c:52 fs/ioctl.c:904 fs/ioctl.c:890)\n  __x64_sys_ioctl (fs/ioctl.c:890)\n  x64_sys_call (arch/x86/entry/syscall_64.c:33)\n  do_syscall_64 (arch/x86/entry/common.c:?)\n  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\n  value changed: 0x00000012 -\u003e 0x00000000"
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              "value": "AV:L - The vulnerable code is entered only from guest execution of PAUSE/WFE/DIAG-0x44 handled by the host KVM module, or equivalently via the `KVM_RUN` ioctl on `/dev/kvm` as shown in the KCSAN stack trace. There is no network-facing path to `kvm_vcpu_on_spin()`, so the attacker must be running code locally on the host or inside a VM hosted on it.\nAC:L - The attacker controls both sides of the race outright \u2014 a guest simply runs PAUSE spin loops on several vCPUs at once, driving many threads into the unsynchronized read/write of `kvm-\u003elast_boosted_vcpu` with no external precondition. No specific victim state or memory layout the attacker cannot influence is required to hit the racing accesses.\nPR:L - The attacker needs the ability to run code inside a VM on the host (or open `/dev/kvm` locally), which is an unprivileged-user-level capability \u2014 no root or CAP_SYS_ADMIN is required, and PAUSE is executable from guest ring 3. This matches the standard treatment of guest-triggerable KVM host bugs.\nUI:N - Triggering requires only that the attacker\u0027s own guest vCPU threads spin concurrently; no host administrator or other user has to perform any action. The race is hit entirely by the attacker\u0027s own execution.\nS:C - The bug is triggered by unprivileged code inside a guest but the corrupted index and any resulting wild pointer access occur in the host kernel, crossing the VM-to-hypervisor security boundary. A guest compromising host kernel availability/integrity is a scope change.\nC:L - A torn value yields an out-of-bounds vCPU index, causing the host to read a pointer-sized slot past the vCPU array and then dereference it (`vcpu-\u003eready`, `vcpu-\u003epreempted`, `target-\u003epid`), touching host kernel memory outside the intended object. The read value is never returned to the guest and the offset is not attacker-chosen, so this is a limited disclosure rather than an arbitrary read primitive.\nI:L - `kvm_vcpu_eligible_for_directed_yield()` writes `vcpu-\u003espin_loop.dy_eligible` through the same unvalidated pointer, giving a fixed-offset host-kernel write via an out-of-bounds vCPU reference, and the bogus target also perturbs host scheduling through `yield_to()`. The written value and target address are not attacker-controlled, limiting this to bounded corruption rather than a control-flow hijack primitive.\nA:H - Per the upstream changelog, the torn access lets KVM fetch a vCPU with an out-of-bounds index; the resulting NULL or garbage pointer is dereferenced without any validation, oopsing or panicking the host kernel. A guest crashing the hypervisor takes down the host and every other VM on it."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxhci: Handle TD clearing for multiple streams case\n\nWhen multiple streams are in use, multiple TDs might be in flight when\nan endpoint is stopped. We need to issue a Set TR Dequeue Pointer for\neach, to ensure everything is reset properly and the caches cleared.\nChange the logic so that any N\u003e1 TDs found active for different streams\nare deferred until after the first one is processed, calling\nxhci_invalidate_cancelled_tds() again from xhci_handle_cmd_set_deq() to\nqueue another command until we are done with all of them. Also change\nthe error/\"should never happen\" paths to ensure we at least clear any\naffected TDs, even if we can\u0027t issue a command to clear the hardware\ncache, and complain loudly with an xhci_warn() if this ever happens.\n\nThis problem case dates back to commit e9df17eb1408 (\"USB: xhci: Correct\nassumptions about number of rings per endpoint.\") early on in the XHCI\ndriver\u0027s life, when stream support was first added.\nIt was then identified but not fixed nor made into a warning in commit\n674f8438c121 (\"xhci: split handling halted endpoints into two steps\"),\nwhich added a FIXME comment for the problem case (without materially\nchanging the behavior as far as I can tell, though the new logic made\nthe problem more obvious).\n\nThen later, in commit 94f339147fc3 (\"xhci: Fix failure to give back some\ncached cancelled URBs.\"), it was acknowledged again.\n\n[Mathias: commit 94f339147fc3 (\"xhci: Fix failure to give back some cached\ncancelled URBs.\") was a targeted regression fix to the previously mentioned\npatch. Users reported issues with usb stuck after unmounting/disconnecting\nUAS devices. This rolled back the TD clearing of multiple streams to its\noriginal state.]\n\nApparently the commit author was aware of the problem (yet still chose\nto submit it): It was still mentioned as a FIXME, an xhci_dbg() was\nadded to log the problem condition, and the remaining issue was mentioned\nin the commit description. The choice of making the log type xhci_dbg()\nfor what is, at this point, a completely unhandled and known broken\ncondition is puzzling and unfortunate, as it guarantees that no actual\nusers would see the log in production, thereby making it nigh\nundebuggable (indeed, even if you turn on DEBUG, the message doesn\u0027t\nreally hint at there being a problem at all).\n\nIt took me *months* of random xHC crashes to finally find a reliable\nrepro and be able to do a deep dive debug session, which could all have\nbeen avoided had this unhandled, broken condition been actually reported\nwith a warning, as it should have been as a bug intentionally left in\nunfixed (never mind that it shouldn\u0027t have been left in at all).\n\n\u003e Another fix to solve clearing the caches of all stream rings with\n\u003e cancelled TDs is needed, but not as urgent.\n\n3 years after that statement and 14 years after the original bug was\nintroduced, I think it\u0027s finally time to fix it. And maybe next time\nlet\u0027s not leave bugs unfixed (that are actually worse than the original\nbug), and let\u0027s actually get people to review kernel commits please.\n\nFixes xHC crashes and IOMMU faults with UAS devices when handling\nerrors/faults. Easiest repro is to use `hdparm` to mark an early sector\n(e.g. 1024) on a disk as bad, then `cat /dev/sdX \u003e /dev/null` in a loop.\nAt least in the case of JMicron controllers, the read errors end up\nhaving to cancel two TDs (for two queued requests to different streams)\nand the one that didn\u0027t get cleared properly ends up faulting the xHC\nentirely when it tries to access DMA pages that have since been unmapped,\nreferred to by the stale TDs. This normally happens quickly (after two\nor three loops). After this fix, I left the `cat` in a loop running\novernight and experienced no xHC failures, with all read errors\nrecovered properly. Repro\u0027d and tested on an Apple M1 Mac Mini\n(dwc3 host).\n\nOn systems without an IOMMU, this bug would instead silently corrupt\nfreed memory, making this a\n---truncated---"
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      "title": "usb: dwc3: st: fix probed platform device ref count on probe error path",
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  "cveMetadata": {
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    "datePublished": "2024-09-13T05:29:10.381Z",
    "dateReserved": "2024-09-11T15:12:18.247Z",
    "dateUpdated": "2026-08-05T11:37:53.435Z",
    "state": "PUBLISHED"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix race between direct IO write and fsync when using same fd\n\nIf we have 2 threads that are using the same file descriptor and one of\nthem is doing direct IO writes while the other is doing fsync, we have a\nrace where we can end up either:\n\n1) Attempt a fsync without holding the inode\u0027s lock, triggering an\n   assertion failures when assertions are enabled;\n\n2) Do an invalid memory access from the fsync task because the file private\n   points to memory allocated on stack by the direct IO task and it may be\n   used by the fsync task after the stack was destroyed.\n\nThe race happens like this:\n\n1) A user space program opens a file descriptor with O_DIRECT;\n\n2) The program spawns 2 threads using libpthread for example;\n\n3) One of the threads uses the file descriptor to do direct IO writes,\n   while the other calls fsync using the same file descriptor.\n\n4) Call task A the thread doing direct IO writes and task B the thread\n   doing fsyncs;\n\n5) Task A does a direct IO write, and at btrfs_direct_write() sets the\n   file\u0027s private to an on stack allocated private with the member\n   \u0027fsync_skip_inode_lock\u0027 set to true;\n\n6) Task B enters btrfs_sync_file() and sees that there\u0027s a private\n   structure associated to the file which has \u0027fsync_skip_inode_lock\u0027 set\n   to true, so it skips locking the inode\u0027s VFS lock;\n\n7) Task A completes the direct IO write, and resets the file\u0027s private to\n   NULL since it had no prior private and our private was stack allocated.\n   Then it unlocks the inode\u0027s VFS lock;\n\n8) Task B enters btrfs_get_ordered_extents_for_logging(), then the\n   assertion that checks the inode\u0027s VFS lock is held fails, since task B\n   never locked it and task A has already unlocked it.\n\nThe stack trace produced is the following:\n\n   assertion failed: inode_is_locked(\u0026inode-\u003evfs_inode), in fs/btrfs/ordered-data.c:983\n   ------------[ cut here ]------------\n   kernel BUG at fs/btrfs/ordered-data.c:983!\n   Oops: invalid opcode: 0000 [#1] PREEMPT SMP PTI\n   CPU: 9 PID: 5072 Comm: worker Tainted: G     U     OE      6.10.5-1-default #1 openSUSE Tumbleweed 69f48d427608e1c09e60ea24c6c55e2ca1b049e8\n   Hardware name: Acer Predator PH315-52/Covini_CFS, BIOS V1.12 07/28/2020\n   RIP: 0010:btrfs_get_ordered_extents_for_logging.cold+0x1f/0x42 [btrfs]\n   Code: 50 d6 86 c0 e8 (...)\n   RSP: 0018:ffff9e4a03dcfc78 EFLAGS: 00010246\n   RAX: 0000000000000054 RBX: ffff9078a9868e98 RCX: 0000000000000000\n   RDX: 0000000000000000 RSI: ffff907dce4a7800 RDI: ffff907dce4a7800\n   RBP: ffff907805518800 R08: 0000000000000000 R09: ffff9e4a03dcfb38\n   R10: ffff9e4a03dcfb30 R11: 0000000000000003 R12: ffff907684ae7800\n   R13: 0000000000000001 R14: ffff90774646b600 R15: 0000000000000000\n   FS:  00007f04b96006c0(0000) GS:ffff907dce480000(0000) knlGS:0000000000000000\n   CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n   CR2: 00007f32acbfc000 CR3: 00000001fd4fa005 CR4: 00000000003726f0\n   Call Trace:\n    \u003cTASK\u003e\n    ? __die_body.cold+0x14/0x24\n    ? die+0x2e/0x50\n    ? do_trap+0xca/0x110\n    ? do_error_trap+0x6a/0x90\n    ? btrfs_get_ordered_extents_for_logging.cold+0x1f/0x42 [btrfs bb26272d49b4cdc847cf3f7faadd459b62caee9a]\n    ? exc_invalid_op+0x50/0x70\n    ? btrfs_get_ordered_extents_for_logging.cold+0x1f/0x42 [btrfs bb26272d49b4cdc847cf3f7faadd459b62caee9a]\n    ? asm_exc_invalid_op+0x1a/0x20\n    ? btrfs_get_ordered_extents_for_logging.cold+0x1f/0x42 [btrfs bb26272d49b4cdc847cf3f7faadd459b62caee9a]\n    ? btrfs_get_ordered_extents_for_logging.cold+0x1f/0x42 [btrfs bb26272d49b4cdc847cf3f7faadd459b62caee9a]\n    btrfs_sync_file+0x21a/0x4d0 [btrfs bb26272d49b4cdc847cf3f7faadd459b62caee9a]\n    ? __seccomp_filter+0x31d/0x4f0\n    __x64_sys_fdatasync+0x4f/0x90\n    do_syscall_64+0x82/0x160\n    ? do_futex+0xcb/0x190\n    ? __x64_sys_futex+0x10e/0x1d0\n    ? switch_fpu_return+0x4f/0xd0\n    ? syscall_exit_to_user_mode+0x72/0x220\n    ? do_syscall_64+0x8e/0x160\n    ? syscall_exit_to_user_mod\n---truncated---"
        }
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            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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              "value": "AV:L - The race is driven purely through local syscalls (`open(O_DIRECT)`, `pwrite`, `fsync`/`fdatasync`, `lseek`) on a file residing on a mounted btrfs filesystem. No network or physical access is involved.\nAC:L - The attacker controls both sides of the race by spawning its own threads on a shared file descriptor; the upstream reproducer triggers the crash \"usually within less than 1 second\" and it was independently hit by ordinary QEMU workloads and syzbot. No condition outside the attacker\u0027s control is required.\nPR:L - Any unprivileged local user with write access to a single file on a btrfs mount (default root filesystem on Fedora/openSUSE/SLE, common for container and NAS storage) can trigger it \u2014 no capabilities, root, or special mount options are needed.\nUI:N - The attacking process performs all steps itself in a tight two-thread loop; no victim action of any kind is required.\nS:U - The flaw and its impact are both confined to the kernel\u0027s own security authority; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - fsync proceeds through the full inode-logging path without the inode\u0027s i_rwsem, producing log-tree state with file extent items pointing to unwritten extents and no checksums, so post-replay reads return stale on-disk data belonging to other/deleted files; additionally the stale stack pointer allows reading another task\u0027s kernel stack contents.\nI:H - A second concurrent O_DIRECT writer and the lseek path both write through the dangling pointer into a destroyed kernel stack frame (a byte flag, and an `extent_state *` via `\u0026private-\u003ellseek_cached_state`), and `btrfs_release_file()` can kfree/free_extent_state stale pointers \u2014 memory corruption usable for control-flow hijack \u2014 alongside unlocked concurrent modification of the log tree corrupting on-disk metadata.\nA:H - The primary observed effect is a hard kernel BUG()/panic at `fs/btrfs/ordered-data.c:983` (\"kernel BUG ... Oops: invalid opcode\"), reproducible within a second by an unprivileged process, giving a reliable full system denial of service."
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          "programFiles": [
            "kernel/bpf/devmap.c"
          ],
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          "vendor": "Linux",
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              "status": "unaffected",
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                  "vulnerable": true
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: devmap: provide rxq after redirect\n\nrxq contains a pointer to the device from where\nthe redirect happened. Currently, the BPF program\nthat was executed after a redirect via BPF_MAP_TYPE_DEVMAP*\ndoes not have it set.\n\nThis is particularly bad since accessing ingress_ifindex, e.g.\n\nSEC(\"xdp\")\nint prog(struct xdp_md *pkt)\n{\n        return bpf_redirect_map(\u0026dev_redirect_map, 0, 0);\n}\n\nSEC(\"xdp/devmap\")\nint prog_after_redirect(struct xdp_md *pkt)\n{\n        bpf_printk(\"ifindex %i\", pkt-\u003eingress_ifindex);\n        return XDP_PASS;\n}\n\ndepends on access to rxq, so a NULL pointer gets dereferenced:\n\n\u003c1\u003e[  574.475170] BUG: kernel NULL pointer dereference, address: 0000000000000000\n\u003c1\u003e[  574.475188] #PF: supervisor read access in kernel mode\n\u003c1\u003e[  574.475194] #PF: error_code(0x0000) - not-present page\n\u003c6\u003e[  574.475199] PGD 0 P4D 0\n\u003c4\u003e[  574.475207] Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI\n\u003c4\u003e[  574.475217] CPU: 4 UID: 0 PID: 217 Comm: kworker/4:1 Not tainted 6.11.0-rc5-reduced-00859-g780801200300 #23\n\u003c4\u003e[  574.475226] Hardware name: Intel(R) Client Systems NUC13ANHi7/NUC13ANBi7, BIOS ANRPL357.0026.2023.0314.1458 03/14/2023\n\u003c4\u003e[  574.475231] Workqueue: mld mld_ifc_work\n\u003c4\u003e[  574.475247] RIP: 0010:bpf_prog_5e13354d9cf5018a_prog_after_redirect+0x17/0x3c\n\u003c4\u003e[  574.475257] Code: cc cc cc cc cc cc cc 80 00 00 00 cc cc cc cc cc cc cc cc f3 0f 1e fa 0f 1f 44 00 00 66 90 55 48 89 e5 f3 0f 1e fa 48 8b 57 20 \u003c48\u003e 8b 52 00 8b 92 e0 00 00 00 48 bf f8 a6 d5 c4 5d a0 ff ff be 0b\n\u003c4\u003e[  574.475263] RSP: 0018:ffffa62440280c98 EFLAGS: 00010206\n\u003c4\u003e[  574.475269] RAX: ffffa62440280cd8 RBX: 0000000000000001 RCX: 0000000000000000\n\u003c4\u003e[  574.475274] RDX: 0000000000000000 RSI: ffffa62440549048 RDI: ffffa62440280ce0\n\u003c4\u003e[  574.475278] RBP: ffffa62440280c98 R08: 0000000000000002 R09: 0000000000000001\n\u003c4\u003e[  574.475281] R10: ffffa05dc8b98000 R11: ffffa05f577fca40 R12: ffffa05dcab24000\n\u003c4\u003e[  574.475285] R13: ffffa62440280ce0 R14: ffffa62440549048 R15: ffffa62440549000\n\u003c4\u003e[  574.475289] FS:  0000000000000000(0000) GS:ffffa05f4f700000(0000) knlGS:0000000000000000\n\u003c4\u003e[  574.475294] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n\u003c4\u003e[  574.475298] CR2: 0000000000000000 CR3: 000000025522e000 CR4: 0000000000f50ef0\n\u003c4\u003e[  574.475303] PKRU: 55555554\n\u003c4\u003e[  574.475306] Call Trace:\n\u003c4\u003e[  574.475313]  \u003cIRQ\u003e\n\u003c4\u003e[  574.475318]  ? __die+0x23/0x70\n\u003c4\u003e[  574.475329]  ? page_fault_oops+0x180/0x4c0\n\u003c4\u003e[  574.475339]  ? skb_pp_cow_data+0x34c/0x490\n\u003c4\u003e[  574.475346]  ? kmem_cache_free+0x257/0x280\n\u003c4\u003e[  574.475357]  ? exc_page_fault+0x67/0x150\n\u003c4\u003e[  574.475368]  ? asm_exc_page_fault+0x26/0x30\n\u003c4\u003e[  574.475381]  ? bpf_prog_5e13354d9cf5018a_prog_after_redirect+0x17/0x3c\n\u003c4\u003e[  574.475386]  bq_xmit_all+0x158/0x420\n\u003c4\u003e[  574.475397]  __dev_flush+0x30/0x90\n\u003c4\u003e[  574.475407]  veth_poll+0x216/0x250 [veth]\n\u003c4\u003e[  574.475421]  __napi_poll+0x28/0x1c0\n\u003c4\u003e[  574.475430]  net_rx_action+0x32d/0x3a0\n\u003c4\u003e[  574.475441]  handle_softirqs+0xcb/0x2c0\n\u003c4\u003e[  574.475451]  do_softirq+0x40/0x60\n\u003c4\u003e[  574.475458]  \u003c/IRQ\u003e\n\u003c4\u003e[  574.475461]  \u003cTASK\u003e\n\u003c4\u003e[  574.475464]  __local_bh_enable_ip+0x66/0x70\n\u003c4\u003e[  574.475471]  __dev_queue_xmit+0x268/0xe40\n\u003c4\u003e[  574.475480]  ? selinux_ip_postroute+0x213/0x420\n\u003c4\u003e[  574.475491]  ? alloc_skb_with_frags+0x4a/0x1d0\n\u003c4\u003e[  574.475502]  ip6_finish_output2+0x2be/0x640\n\u003c4\u003e[  574.475512]  ? nf_hook_slow+0x42/0xf0\n\u003c4\u003e[  574.475521]  ip6_finish_output+0x194/0x300\n\u003c4\u003e[  574.475529]  ? __pfx_ip6_finish_output+0x10/0x10\n\u003c4\u003e[  574.475538]  mld_sendpack+0x17c/0x240\n\u003c4\u003e[  574.475548]  mld_ifc_work+0x192/0x410\n\u003c4\u003e[  574.475557]  process_one_work+0x15d/0x380\n\u003c4\u003e[  574.475566]  worker_thread+0x29d/0x3a0\n\u003c4\u003e[  574.475573]  ? __pfx_worker_thread+0x10/0x10\n\u003c4\u003e[  574.475580]  ? __pfx_worker_thread+0x10/0x10\n\u003c4\u003e[  574.475587]  kthread+0xcd/0x100\n\u003c4\u003e[  574.475597]  ? __pfx_kthread+0x10/0x10\n\u003c4\u003e[  574.475606]  ret_from_fork+0x31/0x50\n\u003c4\u003e[  574.475615]  ? __pfx_kthread+0x10/0x10\n\u003c4\u003e[  574.475623]  ret_from_fork_asm+0x1a/0x\n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The uninitialized `xdp.rxq` is consumed in the XDP fast path during packet receive \u2014 `net_rx_action \u2192 __napi_poll \u2192 veth_poll \u2192 __dev_flush \u2192 bq_xmit_all \u2192 dev_map_bpf_prog_run` \u2014 so remote frames arriving at an XDP-enabled router, load balancer or container host drive the faulting code. This matches the repo\u0027s treatment of sibling XDP-redirect data-path bugs (CVE-2025-38246, CVE-2025-68341, CVE-2024-57932), all scored AV:N.\nAC:L - On an affected configuration every redirected frame deterministically dereferences the stale stack pointer; no race, timing window, or memory-layout condition must be won. For the multi-buffer variant the attacker simply sends an oversized frame to reach `bpf_xdp_frags_increase_tail()`/`bpf_xdp_shrink_data()`.\nPR:N - The attacker only has to put frames on the wire \u2014 no credentials, account, or authentication on the target are involved, and the fault occurs in softirq before any user context. The CAP_BPF/CAP_NET_ADMIN needed to attach XDP and populate the devmap is the victim\u0027s own legitimate configuration of a documented UAPI field, equivalent to enabling a network service, not a step the attacker performs.\nUI:N - Processing happens entirely in NAPI/softirq on frame arrival with no local user involved; the reported oops occurred against background MLD traffic. No victim action is required at attack time.\nS:U - The wild read, the mis-sized `memset()`, and the type-confused page free all occur in kernel memory on the same host, within a single security authority. No hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - `xdp.rxq` holds stale softirq-stack data that is dereferenced as a `struct xdp_rxq_info *`, so `ingress_ifindex` (`rxq-\u003edev-\u003eifindex`), `rx_queue_index` (`rxq-\u003equeue_index`), `rxq-\u003efrag_size` and `rxq-\u003emem` are read from an arbitrary kernel address and returned into the BPF program, which can export them to userspace via maps or the perf ring. That is an unbounded kernel memory disclosure primitive.\nI:H - `bpf_xdp_frags_increase_tail()` derives `tailroom` from the garbage `rxq-\u003efrag_size`, which can underflow and defeat the `offset \u003e tailroom` bound on the following `memset()`, giving a heap out-of-bounds write past the page fragment. `bpf_xdp_shrink_data()` additionally passes a garbage `xdp_mem_info` into `__xdp_return()`, causing a type-confused free across page_pool / page_frag / put_page / xsk_buff_free \u2014 the standard basis for heap corruption and privilege escalation.\nA:H - The commit documents a reproducible `BUG: kernel NULL pointer dereference` oops in softirq context (`bq_xmit_all+0x158`), and a non-zero stale pointer yields an equally fatal wild-address fault or corrupted-free panic. Either way the machine oopses on ordinary inbound traffic, a full denial of service."
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        },
        {
          "url": "https://git.kernel.org/stable/c/ca9984c5f0ab3690d98b13937b2485a978c8dd73"
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      ],
      "title": "bpf: devmap: provide rxq after redirect",
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    "assignerShortName": "Linux",
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    "datePublished": "2024-11-07T09:31:39.141Z",
    "dateReserved": "2024-10-21T19:36:19.961Z",
    "dateUpdated": "2026-08-05T11:42:11.597Z",
    "state": "PUBLISHED"
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{
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              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
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          {
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              "content": {
                "id": "CVE-2024-50155",
                "options": [
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                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
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                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T20:20:37.524773Z",
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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        "title": "CISA ADP Vulnrichment"
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        "references": [
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            "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
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          "product": "Linux",
          "programFiles": [
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