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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_ct: fix skb leak and crash on ooo frags\n\nact_ct adds skb-\u003eusers before defragmentation. If frags arrive in order,\nthe last frag\u0027s reference is reset in:\n\n  inet_frag_reasm_prepare\n    skb_morph\n\nwhich is not straightforward.\n\nHowever when frags arrive out of order, nobody unref the last frag, and\nall frags are leaked. The situation is even worse, as initiating packet\ncapture can lead to a crash[0] when skb has been cloned and shared at the\nsame time.\n\nFix the issue by removing skb_get() before defragmentation. act_ct\nreturns TC_ACT_CONSUMED when defrag failed or in progress.\n\n[0]:\n[  843.804823] ------------[ cut here ]------------\n[  843.809659] kernel BUG at net/core/skbuff.c:2091!\n[  843.814516] invalid opcode: 0000 [#1] PREEMPT SMP\n[  843.819296] CPU: 7 PID: 0 Comm: swapper/7 Kdump: loaded Tainted: G S 6.7.0-rc3 #2\n[  843.824107] Hardware name: XFUSION 1288H V6/BC13MBSBD, BIOS 1.29 11/25/2022\n[  843.828953] RIP: 0010:pskb_expand_head+0x2ac/0x300\n[  843.833805] Code: 8b 70 28 48 85 f6 74 82 48 83 c6 08 bf 01 00 00 00 e8 38 bd ff ff 8b 83 c0 00 00 00 48 03 83 c8 00 00 00 e9 62 ff ff ff 0f 0b \u003c0f\u003e 0b e8 8d d0 ff ff e9 b3 fd ff ff 81 7c 24 14 40 01 00 00 4c 89\n[  843.843698] RSP: 0018:ffffc9000cce07c0 EFLAGS: 00010202\n[  843.848524] RAX: 0000000000000002 RBX: ffff88811a211d00 RCX: 0000000000000820\n[  843.853299] RDX: 0000000000000640 RSI: 0000000000000000 RDI: ffff88811a211d00\n[  843.857974] RBP: ffff888127d39518 R08: 00000000bee97314 R09: 0000000000000000\n[  843.862584] R10: 0000000000000000 R11: ffff8881109f0000 R12: 0000000000000880\n[  843.867147] R13: ffff888127d39580 R14: 0000000000000640 R15: ffff888170f7b900\n[  843.871680] FS:  0000000000000000(0000) GS:ffff889ffffc0000(0000) knlGS:0000000000000000\n[  843.876242] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  843.880778] CR2: 00007fa42affcfb8 CR3: 000000011433a002 CR4: 0000000000770ef0\n[  843.885336] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[  843.889809] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[  843.894229] PKRU: 55555554\n[  843.898539] Call Trace:\n[  843.902772]  \u003cIRQ\u003e\n[  843.906922]  ? __die_body+0x1e/0x60\n[  843.911032]  ? die+0x3c/0x60\n[  843.915037]  ? do_trap+0xe2/0x110\n[  843.918911]  ? pskb_expand_head+0x2ac/0x300\n[  843.922687]  ? do_error_trap+0x65/0x80\n[  843.926342]  ? pskb_expand_head+0x2ac/0x300\n[  843.929905]  ? exc_invalid_op+0x50/0x60\n[  843.933398]  ? pskb_expand_head+0x2ac/0x300\n[  843.936835]  ? asm_exc_invalid_op+0x1a/0x20\n[  843.940226]  ? pskb_expand_head+0x2ac/0x300\n[  843.943580]  inet_frag_reasm_prepare+0xd1/0x240\n[  843.946904]  ip_defrag+0x5d4/0x870\n[  843.950132]  nf_ct_handle_fragments+0xec/0x130 [nf_conntrack]\n[  843.953334]  tcf_ct_act+0x252/0xd90 [act_ct]\n[  843.956473]  ? tcf_mirred_act+0x516/0x5a0 [act_mirred]\n[  843.959657]  tcf_action_exec+0xa1/0x160\n[  843.962823]  fl_classify+0x1db/0x1f0 [cls_flower]\n[  843.966010]  ? skb_clone+0x53/0xc0\n[  843.969173]  tcf_classify+0x24d/0x420\n[  843.972333]  tc_run+0x8f/0xf0\n[  843.975465]  __netif_receive_skb_core+0x67a/0x1080\n[  843.978634]  ? dev_gro_receive+0x249/0x730\n[  843.981759]  __netif_receive_skb_list_core+0x12d/0x260\n[  843.984869]  netif_receive_skb_list_internal+0x1cb/0x2f0\n[  843.987957]  ? mlx5e_handle_rx_cqe_mpwrq_rep+0xfa/0x1a0 [mlx5_core]\n[  843.991170]  napi_complete_done+0x72/0x1a0\n[  843.994305]  mlx5e_napi_poll+0x28c/0x6d0 [mlx5_core]\n[  843.997501]  __napi_poll+0x25/0x1b0\n[  844.000627]  net_rx_action+0x256/0x330\n[  844.003705]  __do_softirq+0xb3/0x29b\n[  844.006718]  irq_exit_rcu+0x9e/0xc0\n[  844.009672]  common_interrupt+0x86/0xa0\n[  844.012537]  \u003c/IRQ\u003e\n[  844.015285]  \u003cTASK\u003e\n[  844.017937]  asm_common_interrupt+0x26/0x40\n[  844.020591] RIP: 0010:acpi_safe_halt+0x1b/0x20\n[  844.023247] Code: ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 65 48 8b 04 25 00 18 03 00 48 8b 00 a8 08 75 0c 66 90 0f 00 2d 81 d0 44 00 fb\n---truncated---"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/filemap: make MAX_PAGECACHE_ORDER acceptable to xarray\n\nPatch series \"mm/filemap: Limit page cache size to that supported by\nxarray\", v2.\n\nCurrently, xarray can\u0027t support arbitrary page cache size.  More details\ncan be found from the WARN_ON() statement in xas_split_alloc().  In our\ntest whose code is attached below, we hit the WARN_ON() on ARM64 system\nwhere the base page size is 64KB and huge page size is 512MB.  The issue\nwas reported long time ago and some discussions on it can be found here\n[1].\n\n[1] https://www.spinics.net/lists/linux-xfs/msg75404.html\n\nIn order to fix the issue, we need to adjust MAX_PAGECACHE_ORDER to one\nsupported by xarray and avoid PMD-sized page cache if needed.  The code\nchanges are suggested by David Hildenbrand.\n\nPATCH[1] adjusts MAX_PAGECACHE_ORDER to that supported by xarray\nPATCH[2-3] avoids PMD-sized page cache in the synchronous readahead path\nPATCH[4] avoids PMD-sized page cache for shmem files if needed\n\nTest program\n============\n# cat test.c\n#define _GNU_SOURCE\n#include \u003cstdio.h\u003e\n#include \u003cstdlib.h\u003e\n#include \u003cunistd.h\u003e\n#include \u003cstring.h\u003e\n#include \u003cfcntl.h\u003e\n#include \u003cerrno.h\u003e\n#include \u003csys/syscall.h\u003e\n#include \u003csys/mman.h\u003e\n\n#define TEST_XFS_FILENAME\t\"/tmp/data\"\n#define TEST_SHMEM_FILENAME\t\"/dev/shm/data\"\n#define TEST_MEM_SIZE\t\t0x20000000\n\nint main(int argc, char **argv)\n{\n\tconst char *filename;\n\tint fd = 0;\n\tvoid *buf = (void *)-1, *p;\n\tint pgsize = getpagesize();\n\tint ret;\n\n\tif (pgsize != 0x10000) {\n\t\tfprintf(stderr, \"64KB base page size is required\\n\");\n\t\treturn -EPERM;\n\t}\n\n\tsystem(\"echo force \u003e /sys/kernel/mm/transparent_hugepage/shmem_enabled\");\n\tsystem(\"rm -fr /tmp/data\");\n\tsystem(\"rm -fr /dev/shm/data\");\n\tsystem(\"echo 1 \u003e /proc/sys/vm/drop_caches\");\n\n\t/* Open xfs or shmem file */\n\tfilename = TEST_XFS_FILENAME;\n\tif (argc \u003e 1 \u0026\u0026 !strcmp(argv[1], \"shmem\"))\n\t\tfilename = TEST_SHMEM_FILENAME;\n\n\tfd = open(filename, O_CREAT | O_RDWR | O_TRUNC);\n\tif (fd \u003c 0) {\n\t\tfprintf(stderr, \"Unable to open \u003c%s\u003e\\n\", filename);\n\t\treturn -EIO;\n\t}\n\n\t/* Extend file size */\n\tret = ftruncate(fd, TEST_MEM_SIZE);\n\tif (ret) {\n\t\tfprintf(stderr, \"Error %d to ftruncate()\\n\", ret);\n\t\tgoto cleanup;\n\t}\n\n\t/* Create VMA */\n\tbuf = mmap(NULL, TEST_MEM_SIZE,\n\t\t   PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);\n\tif (buf == (void *)-1) {\n\t\tfprintf(stderr, \"Unable to mmap \u003c%s\u003e\\n\", filename);\n\t\tgoto cleanup;\n\t}\n\n\tfprintf(stdout, \"mapped buffer at 0x%p\\n\", buf);\n\tret = madvise(buf, TEST_MEM_SIZE, MADV_HUGEPAGE);\n        if (ret) {\n\t\tfprintf(stderr, \"Unable to madvise(MADV_HUGEPAGE)\\n\");\n\t\tgoto cleanup;\n\t}\n\n\t/* Populate VMA */\n\tret = madvise(buf, TEST_MEM_SIZE, MADV_POPULATE_WRITE);\n\tif (ret) {\n\t\tfprintf(stderr, \"Error %d to madvise(MADV_POPULATE_WRITE)\\n\", ret);\n\t\tgoto cleanup;\n\t}\n\n\t/* Punch the file to enforce xarray split */\n\tret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,\n        \t\tTEST_MEM_SIZE - pgsize, pgsize);\n\tif (ret)\n\t\tfprintf(stderr, \"Error %d to fallocate()\\n\", ret);\n\ncleanup:\n\tif (buf != (void *)-1)\n\t\tmunmap(buf, TEST_MEM_SIZE);\n\tif (fd \u003e 0)\n\t\tclose(fd);\n\n\treturn 0;\n}\n\n# gcc test.c -o test\n# cat /proc/1/smaps | grep KernelPageSize | head -n 1\nKernelPageSize:       64 kB\n# ./test shmem\n   :\n------------[ cut here ]------------\nWARNING: CPU: 17 PID: 5253 at lib/xarray.c:1025 xas_split_alloc+0xf8/0x128\nModules linked in: nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib  \\\nnft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct    \\\nnft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4    \\\nip_set nf_tables rfkill nfnetlink vfat fat virtio_balloon          \\\ndrm fuse xfs libcrc32c crct10dif_ce ghash_ce sha2_ce sha256_arm64  \\\nvirtio_net sha1_ce net_failover failover virtio_console virtio_blk \\\ndimlib virtio_mmio\nCPU: 17 PID: 5253 Comm: test Kdump: loaded Tainted: G W 6.10.0-rc5-gavin+ #12\nHardware name: QEMU KVM Virtual Machine, BIOS edk2-20240524-1.el9 05/24/2024\npstate: 83400005 (Nzcv daif +PAN -UAO +TC\n---truncated---"
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      "title": "ALSA: line6: Fix racy access to midibuf",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: add sanity checks to rx zerocopy\n\nTCP rx zerocopy intent is to map pages initially allocated\nfrom NIC drivers, not pages owned by a fs.\n\nThis patch adds to can_map_frag() these additional checks:\n\n- Page must not be a compound one.\n- page-\u003emapping must be NULL.\n\nThis fixes the panic reported by ZhangPeng.\n\nsyzbot was able to loopback packets built with sendfile(),\nmapping pages owned by an ext4 file to TCP rx zerocopy.\n\nr3 = socket$inet_tcp(0x2, 0x1, 0x0)\nmmap(\u0026(0x7f0000ff9000/0x4000)=nil, 0x4000, 0x0, 0x12, r3, 0x0)\nr4 = socket$inet_tcp(0x2, 0x1, 0x0)\nbind$inet(r4, \u0026(0x7f0000000000)={0x2, 0x4e24, @multicast1}, 0x10)\nconnect$inet(r4, \u0026(0x7f00000006c0)={0x2, 0x4e24, @empty}, 0x10)\nr5 = openat$dir(0xffffffffffffff9c, \u0026(0x7f00000000c0)=\u0027./file0\\x00\u0027,\n    0x181e42, 0x0)\nfallocate(r5, 0x0, 0x0, 0x85b8)\nsendfile(r4, r5, 0x0, 0x8ba0)\ngetsockopt$inet_tcp_TCP_ZEROCOPY_RECEIVE(r4, 0x6, 0x23,\n    \u0026(0x7f00000001c0)={\u0026(0x7f0000ffb000/0x3000)=nil, 0x3000, 0x0, 0x0, 0x0,\n    0x0, 0x0, 0x0, 0x0}, \u0026(0x7f0000000440)=0x40)\nr6 = openat$dir(0xffffffffffffff9c, \u0026(0x7f00000000c0)=\u0027./file0\\x00\u0027,\n    0x181e42, 0x0)"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Acquire kvm-\u003esrcu when handling KVM_SET_VCPU_EVENTS\n\nGrab kvm-\u003esrcu when processing KVM_SET_VCPU_EVENTS, as KVM will forcibly\nleave nested VMX/SVM if SMM mode is being toggled, and leaving nested VMX\nreads guest memory.\n\nNote, kvm_vcpu_ioctl_x86_set_vcpu_events() can also be called from KVM_RUN\nvia sync_regs(), which already holds SRCU.  I.e. trying to precisely use\nkvm_vcpu_srcu_read_lock() around the problematic SMM code would cause\nproblems.  Acquiring SRCU isn\u0027t all that expensive, so for simplicity,\ngrab it unconditionally for KVM_SET_VCPU_EVENTS.\n\n =============================\n WARNING: suspicious RCU usage\n 6.10.0-rc7-332d2c1d713e-next-vm #552 Not tainted\n -----------------------------\n include/linux/kvm_host.h:1027 suspicious rcu_dereference_check() usage!\n\n other info that might help us debug this:\n\n rcu_scheduler_active = 2, debug_locks = 1\n 1 lock held by repro/1071:\n  #0: ffff88811e424430 (\u0026vcpu-\u003emutex){+.+.}-{3:3}, at: kvm_vcpu_ioctl+0x7d/0x970 [kvm]\n\n stack backtrace:\n CPU: 15 PID: 1071 Comm: repro Not tainted 6.10.0-rc7-332d2c1d713e-next-vm #552\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n Call Trace:\n  \u003cTASK\u003e\n  dump_stack_lvl+0x7f/0x90\n  lockdep_rcu_suspicious+0x13f/0x1a0\n  kvm_vcpu_gfn_to_memslot+0x168/0x190 [kvm]\n  kvm_vcpu_read_guest+0x3e/0x90 [kvm]\n  nested_vmx_load_msr+0x6b/0x1d0 [kvm_intel]\n  load_vmcs12_host_state+0x432/0xb40 [kvm_intel]\n  vmx_leave_nested+0x30/0x40 [kvm_intel]\n  kvm_vcpu_ioctl_x86_set_vcpu_events+0x15d/0x2b0 [kvm]\n  kvm_arch_vcpu_ioctl+0x1107/0x1750 [kvm]\n  ? mark_held_locks+0x49/0x70\n  ? kvm_vcpu_ioctl+0x7d/0x970 [kvm]\n  ? kvm_vcpu_ioctl+0x497/0x970 [kvm]\n  kvm_vcpu_ioctl+0x497/0x970 [kvm]\n  ? lock_acquire+0xba/0x2d0\n  ? find_held_lock+0x2b/0x80\n  ? do_user_addr_fault+0x40c/0x6f0\n  ? lock_release+0xb7/0x270\n  __x64_sys_ioctl+0x82/0xb0\n  do_syscall_64+0x6c/0x170\n  entry_SYSCALL_64_after_hwframe+0x4b/0x53\n RIP: 0033:0x7ff11eb1b539\n  \u003c/TASK\u003e"
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              "value": "AV:L - The vulnerability is reached solely through ioctls on a KVM vCPU file descriptor (`KVM_SET_NESTED_STATE` then `KVM_SET_VCPU_EVENTS`), racing against `KVM_SET_USER_MEMORY_REGION` on the VM fd. This requires local access to /dev/kvm with no network component.\nAC:L - The attacker owns both sides of the race \u2014 one thread toggles SMM via KVM_SET_VCPU_EVENTS while another deletes/moves memslots \u2014 and the two paths take disjoint locks (vcpu-\u003emutex vs kvm-\u003eslots_lock). Because the unprotected read is a __copy_from_user() on the attacker\u0027s own guest mapping, userfaultfd/FUSE backing can stall the reader inside the window indefinitely, making the race deterministically winnable.\nPR:L - Only an open /dev/kvm descriptor is needed, which systemd\u0027s default udev rule grants world read/write (MODE=0666), and nested-virt CI runners, cloud images, and Android AVF routinely expose KVM to unprivileged users. No CAP_SYS_ADMIN or real root is required.\nUI:N - The attacker\u0027s own process performs every step \u2014 creating the VM, stuffing nested state, toggling SMM, and cycling memslots. No action by any other user is involved.\nS:U - The attacker is already host userspace and the impact is on the host kernel, so no security boundary is crossed; this is not a guest-to-host escape since guest-initiated SMM transitions go through KVM_RUN, which already holds SRCU. Vulnerable and impacted components share the same security authority.\nC:H - The missing SRCU read lock yields a use-after-free read of a kfree()\u0027d struct kvm_memory_slot and of rbtree nodes in search_memslots(), and a reallocated slot gives the attacker control of userspace_addr/base_gfn/npages plus arch.rmap pointers. This permits reading memory of deleted regions and, via heap grooming, arbitrary kernel-memory disclosure.\nI:H - A freed slot that is reallocated with attacker-groomed contents is used to compute host addresses and is consumed by KVM\u0027s MMU and nested_vmx_load_msr(), and the concurrently-mutated rbtree traversal writes back into slots-\u003elast_used_slot. This gives the corruption-and-control-flow primitives characteristic of an exploitable heap UAF.\nA:H - Dereferencing freed memslot objects and walking an rbtree whose nodes are being freed under the reader reliably produces wild-pointer dereferences, oopses, and kernel panics. Any local user with /dev/kvm can trigger this in a loop to crash the host."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkcm: Serialise kcm_sendmsg() for the same socket.\n\nsyzkaller reported UAF in kcm_release(). [0]\n\nThe scenario is\n\n  1. Thread A builds a skb with MSG_MORE and sets kcm-\u003eseq_skb.\n\n  2. Thread A resumes building skb from kcm-\u003eseq_skb but is blocked\n     by sk_stream_wait_memory()\n\n  3. Thread B calls sendmsg() concurrently, finishes building kcm-\u003eseq_skb\n     and puts the skb to the write queue\n\n  4. Thread A faces an error and finally frees skb that is already in the\n     write queue\n\n  5. kcm_release() does double-free the skb in the write queue\n\nWhen a thread is building a MSG_MORE skb, another thread must not touch it.\n\nLet\u0027s add a per-sk mutex and serialise kcm_sendmsg().\n\n[0]:\nBUG: KASAN: slab-use-after-free in __skb_unlink include/linux/skbuff.h:2366 [inline]\nBUG: KASAN: slab-use-after-free in __skb_dequeue include/linux/skbuff.h:2385 [inline]\nBUG: KASAN: slab-use-after-free in __skb_queue_purge_reason include/linux/skbuff.h:3175 [inline]\nBUG: KASAN: slab-use-after-free in __skb_queue_purge include/linux/skbuff.h:3181 [inline]\nBUG: KASAN: slab-use-after-free in kcm_release+0x170/0x4c8 net/kcm/kcmsock.c:1691\nRead of size 8 at addr ffff0000ced0fc80 by task syz-executor329/6167\n\nCPU: 1 PID: 6167 Comm: syz-executor329 Tainted: G    B              6.8.0-rc5-syzkaller-g9abbc24128bc #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024\nCall trace:\n dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291\n show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0x178/0x518 mm/kasan/report.c:488\n kasan_report+0xd8/0x138 mm/kasan/report.c:601\n __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381\n __skb_unlink include/linux/skbuff.h:2366 [inline]\n __skb_dequeue include/linux/skbuff.h:2385 [inline]\n __skb_queue_purge_reason include/linux/skbuff.h:3175 [inline]\n __skb_queue_purge include/linux/skbuff.h:3181 [inline]\n kcm_release+0x170/0x4c8 net/kcm/kcmsock.c:1691\n __sock_release net/socket.c:659 [inline]\n sock_close+0xa4/0x1e8 net/socket.c:1421\n __fput+0x30c/0x738 fs/file_table.c:376\n ____fput+0x20/0x30 fs/file_table.c:404\n task_work_run+0x230/0x2e0 kernel/task_work.c:180\n exit_task_work include/linux/task_work.h:38 [inline]\n do_exit+0x618/0x1f64 kernel/exit.c:871\n do_group_exit+0x194/0x22c kernel/exit.c:1020\n get_signal+0x1500/0x15ec kernel/signal.c:2893\n do_signal+0x23c/0x3b44 arch/arm64/kernel/signal.c:1249\n do_notify_resume+0x74/0x1f4 arch/arm64/kernel/entry-common.c:148\n exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline]\n exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline]\n el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:713\n el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730\n el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598\n\nAllocated by task 6166:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x40/0x78 mm/kasan/common.c:68\n kasan_save_alloc_info+0x70/0x84 mm/kasan/generic.c:626\n unpoison_slab_object mm/kasan/common.c:314 [inline]\n __kasan_slab_alloc+0x74/0x8c mm/kasan/common.c:340\n kasan_slab_alloc include/linux/kasan.h:201 [inline]\n slab_post_alloc_hook mm/slub.c:3813 [inline]\n slab_alloc_node mm/slub.c:3860 [inline]\n kmem_cache_alloc_node+0x204/0x4c0 mm/slub.c:3903\n __alloc_skb+0x19c/0x3d8 net/core/skbuff.c:641\n alloc_skb include/linux/skbuff.h:1296 [inline]\n kcm_sendmsg+0x1d3c/0x2124 net/kcm/kcmsock.c:783\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg net/socket.c:745 [inline]\n sock_sendmsg+0x220/0x2c0 net/socket.c:768\n splice_to_socket+0x7cc/0xd58 fs/splice.c:889\n do_splice_from fs/splice.c:941 [inline]\n direct_splice_actor+0xec/0x1d8 fs/splice.c:1164\n splice_direct_to_actor+0x438/0xa0c fs/splice.c:1108\n do_splice_direct_actor \n---truncated---"
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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            {
              "lang": "en",
              "value": "AV:L - The vulnerable code is reached only through local `sendmsg(2)`/`sendfile(2)`/`splice(2)` syscalls on an AF_KCM socket the attacker opened; a remote peer cannot drive `kcm_sendmsg()`. Local code execution on the system is required.\nAC:L - The attacker controls both sides of the race (two threads on one fd it owns) and controls the blocking window itself by shrinking `SO_SNDBUF` so `sk_stream_wait_memory()` reliably blocks with the sock lock dropped; syzbot reproduced it and confirmed the fix.\nPR:L - `kcm_create()` performs no `capable()`/`ns_capable()` check and `__sock_create()` autoloads `net-pf-41` without a capability gate, so any unprivileged local user can open a PF_KCM socket; no psock attach or CAP_NET_ADMIN is needed since the corrupted skb is purged at `kcm_release()`.\nUI:N - The attacker\u0027s own two threads perform every step \u2014 create the socket, race the sendmsg calls, and close the fd. No victim action is involved.\nS:U - The use-after-free and double free are confined to kernel heap within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - A freed `skbuff_head_cache` object stays linked in `sk_write_queue`, so its reclaimed contents are read back and, with an attached psock, `kcm_write_msgs()` can transmit the freed skb\u0027s frags to the peer \u2014 leaking kernel heap; a UAF of this shape is a general arbitrary-read primitive.\nI:H - `__skb_unlink()` on the freed skb writes through attacker-reclaimable `next`/`prev` pointers (`next-\u003eprev = prev; prev-\u003enext = next`), yielding a write-what-where primitive, compounded by a genuine double free of the skb \u2014 both are exploitable for control-flow hijack and privilege escalation.\nA:H - The reported KASAN slab-use-after-free in `kcm_release()` plus the double free corrupt the skb list and slab freelist, causing kernel oops/panic; any unprivileged user can trigger this repeatedly."
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          ]
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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "4.15"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.50",
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            },
            {
              "lessThanOrEqual": "6.10.*",
              "status": "unaffected",
              "version": "6.10.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.11",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.50",
                  "versionStartIncluding": "4.15",
                  "vulnerable": true
                },
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                  "versionEndExcluding": "6.10.9",
                  "versionStartIncluding": "4.15",
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Check index for aux_rd_interval before using\n\naux_rd_interval has size of 7 and should be checked.\n\nThis fixes 3 OVERRUN and 1 INTEGER_OVERFLOW issues reported by Coverity."
        }
      ],
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          "url": "https://git.kernel.org/stable/c/48e0b68e2360b16edf2a0bae05c0051c00fbb48a"
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        {
          "url": "https://git.kernel.org/stable/c/6c588e9350dd7a9fb97a56fe74852c9ecc44450c"
        },
        {
          "url": "https://git.kernel.org/stable/c/9ba2ea6337b4f159aecb177555a6a81da92d302e"
        }
      ],
      "title": "drm/amd/display: Check index for aux_rd_interval before using",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-46728",
    "datePublished": "2024-09-18T06:32:24.274Z",
    "dateReserved": "2024-09-11T15:12:18.256Z",
    "dateUpdated": "2026-05-11T20:35:15.004Z",
    "state": "PUBLISHED"
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}