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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmac802154: fix use-after-free of sdata via queued RX frames\n\nThe RX softirq producer ieee802154_subif_frame() queues received beacon\nand MAC-command frames onto local-\u003erx_beacon_list / rx_mac_cmd_list and\nschedules a process-context worker, storing a raw mac_pkt-\u003esdata (and\nskb-\u003edev == sdata-\u003edev) with neither a reference nor any locking:\n\n - the lists have no lock: the softirq producer list_add_tail()s while the\n   mac_wq worker list_del()s, so sibling interfaces on the same phy corrupt\n   the list;\n\n - the workers dereference the interface after it may have been freed.\n   mac802154_rx_mac_cmd_worker() touches mac_pkt-\u003esdata directly, and\n   mac802154_rx_beacon_worker() -\u003e mac802154_process_beacon() dereferences\n   skb-\u003edev (== sdata-\u003edev). Removing an interface frees its sdata\n   (netdev_priv) while a queued frame still points at it, so a later worker\n   run is a use-after-free.\n\nReproduced under KASAN by flooding a victim interface with MAC command\nframes and removing it (the beacon path is the same class via skb-\u003edev):\n\n  BUG: KASAN: slab-use-after-free in mac802154_rx_mac_cmd_worker+0x463/0x630 [mac802154]\n  Read of size 4 at addr ffff888002f9ea18 by task kworker/u8:1/31\n  Workqueue: phy0-mac-cmds mac802154_rx_mac_cmd_worker [mac802154]\n  Call Trace:\n   mac802154_rx_mac_cmd_worker+0x463/0x630 [mac802154]\n   process_one_work+0x611/0xe80\n   worker_thread+0x52e/0xdc0\n   kthread+0x30c/0x630\n   ret_from_fork+0x2fd/0x3e0\n\nFix both lists together:\n\n - add local-\u003erx_lock and take it around every list access: the softirq\n   producer (plain spin_lock, softirq context) and the workers and flush\n   (spin_lock_bh, process context);\n\n - pin the interface for the lifetime of a queued frame with\n   netdev_hold()/netdev_put(), so the worker can safely dereference sdata /\n   skb-\u003edev even while the interface is being removed;\n\n - dequeue under the lock at the head and loop-drain the whole list in the\n   workers (they previously processed one frame per run and relied on a\n   later enqueue to drain the rest);\n\n - drop not-yet-started frames of an interface before it is unregistered,\n   from ieee802154_if_remove() (after the RCU grace period) and from the\n   ieee802154_remove_interfaces() loop -- the latter is the whole-phy\n   teardown path, which does not go through ieee802154_if_remove().\n\nAn in-flight worker that already dequeued a frame keeps its own netdev\nreference; unregister_netdevice() then waits it out in netdev_run_todo(),\nwhich runs at rtnl_unlock() (rtnl released) and after the interface has\nbeen closed, so it does not pin rtnl. A worker blocked in an association\nTX only delays that one interface\u0027s unregister (the usual \"waiting for %s\nto become free\"), it does not hold rtnl. netdev_hold() is used for this\nreason instead of a cancel_work_sync() under rtnl, which would block on\nthe worker\u0027s unbounded MLME TX wait via ieee802154_sync_queue().\n\nThe mac-command worker additionally skips processing for a stopped\ninterface (ieee802154_sdata_running()), avoiding a needless association\nresponse during teardown."
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            "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
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              "value": "AV:A - ieee802154_subif_frame() queues every received IEEE 802.15.4 MAC command frame (and beacons during a scan) onto local-\u003erx_mac_cmd_list/rx_beacon_list from the RX tasklet with no lock, so a sender in radio range supplies the frames that race the mac_wq worker; 802.15.4 is a radio link, so this is adjacent rather than network.\nAC:H - A remote attacker only reaches the bug by making the tasklet\u0027s unlocked list_add_tail() collide with the worker\u0027s list_del() on another CPU. They control the flood but not the worker\u0027s timing, and the window is a few pointer writes. The use-after-free of sdata also needs an interface removal that the remote attacker cannot cause.\nPR:N - __ieee802154_rx_handle_packet() hands every parsed frame to each running non-monitor interface, and ieee802154_subif_frame() queues MAC command frames with no association or scan state required; unsecured frames pass mac802154_llsec_decrypt(), so no credentials are needed.\nUI:N - The victim only needs a running 802.15.4 interface, which is its normal operating state; the attacker sends the frames and the kernel queues and processes them without any user action.\nS:U - The corruption stays within the host kernel (mac802154 RX lists, cfg802154_mac_pkt, netdev_priv sdata) and crosses no VM or IOMMU boundary.\nC:H - A corrupted rx_mac_cmd_list or rx_beacon_list lets the worker dereference freed cfg802154_mac_pkt entries, their skb and sdata. Reclaimed slab contents are then read as kernel pointers, a use-after-free read that can disclose kernel memory.\nI:H - The worker does list_del(), kfree() and kfree_skb() on stale mac_pkt entries, and mac802154_process_association_req/resp() write through the freed sdata, giving write and double-free primitives on reclaimable slab memory.\nA:H - List corruption or the sdata use-after-free in mac802154_rx_mac_cmd_worker() or mac802154_rx_beacon_worker() causes a kernel oops; the commit\u0027s KASAN report shows such a slab-use-after-free."
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              "value": "AV:L - The triggering input is a forged IWPM reply (e.g. RDMA_NL_IWPM_REG_PID) sent over a local NETLINK_RDMA socket to iwcm_nl_cb_table callbacks, which call iwpm_find_nlmsg_request(). No remote protocol carries it, and rdma_nl_rcv_msg() rejects RDMA_NL_IWCM messages from outside init_net.\nAC:H - The forged reply must land in the few-instruction gap between list_add_tail() and kref_init()/sema_init() in iwpm_get_nlmsg_request(). The host also needs an iWARP device so that iw_cm_map() sends port-mapper requests, and the attacker cannot set that up.\nPR:L - No iwcm_nl_cb_table entry sets RDMA_NL_ADMIN_PERM, and the NETLINK_RDMA socket uses NL_CFG_F_NONROOT_RECV, so an unprivileged user in the initial netns can join RDMA_NL_GROUP_IWPM, read the sequence numbers and send replies. A local login is still needed.\nUI:N - The attacker sends the netlink replies and starts iWARP connection setup without any action from another user.\nS:U - The memory corruption stays inside the kernel\u0027s own security authority. No guest/host or IOMMU boundary is crossed.\nC:H - kref_init() erases the reference taken by iwpm_find_nlmsg_request(), so the requester\u0027s kref_put() in iwpm_wait_complete_req() can free the kmalloc\u0027d iwpm_nlmsg_request while iwpm_register_pid_cb() still uses it. That is a use-after-free that can be reclaimed by sprayed data.\nI:H - After the early free, the callback\u0027s up(\u0026nlmsg_request-\u003esem) and the requester\u0027s down_timeout() write a semaphore inside a freed and possibly reclaimed slab object. That is a use-after-free write on heap memory.\nA:H - The race fires a refcount_t \u0027addition on 0\u0027 WARN (a panic under panic_on_warn), and the replies can dereference NULL req_buffer in iwpm_register_pid_cb() or touch freed memory, either of which oopses the kernel."
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          "url": "https://git.kernel.org/stable/c/33fb59da49c4c3f5c2ec9f9d4447a56857a02c02"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: do not trim a device which is not writeable\n\n[BUG]\nThere is a bug report that btrfs/242 can randomly fail with the\nfollowing NULL pointer dereference:\n\n  run fstests btrfs/242 at 2026-06-01 10:25:08\n  BTRFS: device fsid d4d7f234-487c-4787-88e4-47a8b68c9874 devid 1 transid 9 /dev/sdc (8:32) scanned by mount (122609)\n  BTRFS info (device sdc): first mount of filesystem d4d7f234-487c-4787-88e4-47a8b68c9874\n  BTRFS info (device sdc): using crc32c checksum algorithm\n  BTRFS warning (device sdc): devid 2 uuid fbe72d72-3272-482d-80fb-ab88ed398192 is missing\n  BTRFS warning (device sdc): devid 2 uuid fbe72d72-3272-482d-80fb-ab88ed398192 is missing\n  BTRFS info (device sdc): allowing degraded mounts\n  BTRFS info (device sdc): turning on async discard\n  BTRFS info (device sdc): enabling free space tree\n  Unable to handle kernel NULL pointer dereference at virtual address 0000000000000018\n  user pgtable: 4k pages, 48-bit VAs, pgdp=000000013fd6b000\n  CPU: 4 UID: 0 PID: 122625 Comm: fstrim Not tainted 7.0.10-2-default #1 PREEMPT(full) openSUSE Tumbleweed e9a5f6b24978fba3bf015a992f865837fdfff3dd\n  Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20250812-19.fc42 08/12/2025\n  pstate: 01400005 (nzcv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)\n  pc : btrfs_trim_fs+0x34c/0xa00 [btrfs]\n  lr : btrfs_trim_fs+0x1f0/0xa00 [btrfs]\n  Call trace:\n   btrfs_trim_fs+0x34c/0xa00 [btrfs f02c1d570ceea621c69d302ba75dd61868083840] (P)\n   btrfs_ioctl_fitrim+0xe8/0x178 [btrfs f02c1d570ceea621c69d302ba75dd61868083840]\n   btrfs_ioctl+0xdd4/0x2bd8 [btrfs f02c1d570ceea621c69d302ba75dd61868083840]\n   __arm64_sys_ioctl+0xac/0x108\n   invoke_syscall.constprop.0+0x5c/0xd0\n   el0_svc_common.constprop.0+0x40/0xf0\n   do_el0_svc+0x24/0x40\n   el0_svc+0x40/0x1d0\n   el0t_64_sync_handler+0xa0/0xe8\n   el0t_64_sync+0x1b0/0x1b8\n  Code: 17ffff83 f94017e0 f9002be0 f9402ea0 (f9400c00)\n  ---[ end trace 0000000000000000  ]---\n\nAlso the reporter is very kind to test the following ASSERT() added to\nbtrfs_trim_free_extents_throttle():\n\n\tASSERT(device-\u003ebdev,\n\t       \"devid=%llu path=%s dev_state=0x%lx\\n\",\n\t       device-\u003edevid, btrfs_dev_name(device), device-\u003edev_state);\n\nAnd it shows the following output:\n\n  assertion failed: device-\u003ebdev, in extent-tree.c:6630 (devid=2 path=/dev/sdd dev_state=0x82)\n\nWhich means the device-\u003ebdev is NULL, and the dev_state is\nBTRFS_DEV_STATE_IN_FS_METADATA | BTRFS_DEV_STATE_ITEM_FOUND, without\nBTRFS_DEV_STATE_WRITEABLE flag set.\n\n[CAUSE]\nThe pc points to the following call chain:\n\n  btrfs_trim_fs()\n  |- btrfs_trim_free_extents()\n     |- btrfs_trim_free_extents_throttle()\n        |- bdev_max_discard_sectors(device-\u003ebdev)\n\nSo the NULL pointer dereference is caused by device-\u003ebdev being NULL.\n\nThis looks impossible by a quick glance, as just before calling\nbtrfs_trim_free_extents_throttle(), we have skipped any device that has\nBTRFS_DEV_STATE_MISSING flag set.\n\nHowever in this particular case, there is a window where the missing\ndevice is later re-scanned, causing btrfs to remove the\nBTRFS_DEV_STATE_MISSING flag:\n\n  btrfs_control_ioctl()\n  |- btrfs_scan_one_device()\n     |- device_list_add()\n        |- rcu_assign_pointer(device-\u003ename, name);\n        |  This updates the missing device\u0027s path to the new good path.\n        |\n        |- clear_bit(BTRFS_DEV_STATE_MISSING, \u0026device-\u003edev_state)\n           This removes the BTRFS_DEV_STATE_MISSING flag.\n\nThis allows the missing device to re-appear and clear the\nBTRFS_DEV_STATE_MISSING flag.  However the device still does not have\nthe BTRFS_DEV_STATE_WRITEABLE flag set, nor is its bdev pointer updated.\n\nThe bdev pointer remains NULL, triggering the crash later.\n\n[FIX]\nThis is a big de-synchronization between BTRFS_DEV_STATE_MISSING and\ndevice-\u003ebdev pointer, and shows a gap in btrfs\u0027s re-appearing-device\nhandling.\n\nThe proper handling of re-appearing device will need quite some extra\nwork, which is out of the context of this small\n---truncated---"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: balance: fix potential bg lookup failure in btrfs_may_alloc_data_chunk()\n\n[BUG]\nRunning btrfs balance can trigger a null-ptr-deref before relocating a\ndata chunk when metadata corruption leaves a chunk in the chunk tree\nwithout a corresponding block group in the in-memory cache:\n\n  KASAN: null-ptr-deref in range [0x0000000000000088-0x000000000000008f]\n  RIP: 0010:btrfs_may_alloc_data_chunk+0x40/0x1c0 fs/btrfs/volumes.c:3601\n  Call Trace:\n    __btrfs_balance fs/btrfs/volumes.c:4217 [inline]\n    btrfs_balance+0x2516/0x42b0 fs/btrfs/volumes.c:4604\n    btrfs_ioctl_balance fs/btrfs/ioctl.c:3577 [inline]\n    btrfs_ioctl+0x25cf/0x5b90 fs/btrfs/ioctl.c:5313\n    ...\n\n[CAUSE]\n__btrfs_balance() iterates the on-disk chunk tree and passes the chunk\nlogical bytenr to btrfs_may_alloc_data_chunk() before relocating a data\nchunk. That helper then queries the in-memory block group cache:\n\n  cache = btrfs_lookup_block_group(fs_info, chunk_offset);\n  chunk_type = cache-\u003eflags;   /* cache may be NULL */\n\nA corrupt image can contain a chunk item whose matching block group\nitem is missing, so no block group is ever inserted into the cache. In\nthat case btrfs_lookup_block_group() returns NULL.\n\nThe code only guards this with ASSERT(cache), which becomes a no-op when\nCONFIG_BTRFS_ASSERT is disabled. The subsequent dereference of\ncache-\u003eflags therefore crashes the kernel.\n\n[FIX]\nAdd a NULL check after btrfs_lookup_block_group() in\nbtrfs_may_alloc_data_chunk() and print and error message for clarity."
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          "url": "https://git.kernel.org/stable/c/18d32b0013efba19f7ad3e5b08d7aee813d604a6"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath12k: fix memory leak in ath12k_wifi7_dp_rx_h_verify_tkip_mic()\n\nIn ath12k_wifi7_dp_rx_h_verify_tkip_mic(), the call to\nath12k_dp_rx_check_nwifi_hdr_len_valid() may return false when the\nNWIFI header length is invalid, causing the function to abort early with\n-EINVAL.\n\nWhen this happens, the error propagates to\nath12k_wifi7_dp_rx_h_defrag(), which clears first_frag by setting it\nto NULL. As a result, the corresponding MSDU is no longer referenced\nby the defragmentation path and is never freed.\n\nThis leads to a memory leak for the affected MSDU on this error path.\nProper cleanup is required to ensure the MSDU is released when header\nvalidation fails during TKIP MIC verification.\n\nTested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c5-00302-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.115823.3"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: don\u0027t free qgroup space unless specified\n\nBoris noticed in his simple quotas testing that he was getting a leak\nwith Sweet Tea\u0027s change to subvol create that stopped doing a\ntransaction commit.  This was just a side effect of that change.\n\nIn the delayed inode code we have an optimization that will free extra\nreservations if we think we can pack a dir item into an already modified\nleaf.  Previously this wouldn\u0027t be triggered in the subvolume create\ncase because we\u0027d commit the transaction, it was still possible but\nmuch harder to trigger.  It could actually be triggered if we did a\nmkdir \u0026\u0026 subvol create with qgroups enabled.\n\nThis occurs because in btrfs_insert_delayed_dir_index(), which gets\ncalled when we\u0027re adding the dir item, we do the following:\n\n  btrfs_block_rsv_release(fs_info, trans-\u003eblock_rsv, bytes, NULL);\n\nif we\u0027re able to skip reserving space.\n\nThe problem here is that trans-\u003eblock_rsv points at the temporary block\nrsv for the subvolume create, which has qgroup reservations in the block\nrsv.\n\nThis is a problem because btrfs_block_rsv_release() will do the\nfollowing:\n\n  if (block_rsv-\u003eqgroup_rsv_reserved \u003e= block_rsv-\u003eqgroup_rsv_size) {\n\t  qgroup_to_release = block_rsv-\u003eqgroup_rsv_reserved -\n\t\t  block_rsv-\u003eqgroup_rsv_size;\n\t  block_rsv-\u003eqgroup_rsv_reserved = block_rsv-\u003eqgroup_rsv_size;\n  }\n\nThe temporary block rsv just has -\u003eqgroup_rsv_reserved set,\n-\u003eqgroup_rsv_size == 0.  The optimization in\nbtrfs_insert_delayed_dir_index() sets -\u003eqgroup_rsv_reserved = 0.  Then\nlater on when we call btrfs_subvolume_release_metadata() which has\n\n  btrfs_block_rsv_release(fs_info, rsv, (u64)-1, \u0026qgroup_to_release);\n  btrfs_qgroup_convert_reserved_meta(root, qgroup_to_release);\n\nqgroup_to_release is set to 0, and we do not convert the reserved\nmetadata space.\n\nThe problem here is that the block rsv code has been unconditionally\nmessing with -\u003eqgroup_rsv_reserved, because the main place this is used\nis delalloc, and any time we call btrfs_block_rsv_release() we do it\nwith qgroup_to_release set, and thus do the proper accounting.\n\nThe subvolume code is the only other code that uses the qgroup\nreservation stuff, but it\u0027s intermingled with the above optimization,\nand thus was getting its reservation freed out from underneath it and\nthus leaking the reserved space.\n\nThe solution is to simply not mess with the qgroup reservations if we\ndon\u0027t have qgroup_to_release set.  This works with the existing code as\nanything that messes with the delalloc reservations always have\nqgroup_to_release set.  This fixes the leak that Boris was observing."
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        {
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: always detect conflicting inodes when logging inode refs\n\nAfter rename exchanging (either with the rename exchange operation or\nregular renames in multiple non-atomic steps) two inodes and at least\none of them is a directory, we can end up with a log tree that contains\nonly of the inodes and after a power failure that can result in an attempt\nto delete the other inode when it should not because it was not deleted\nbefore the power failure. In some case that delete attempt fails when\nthe target inode is a directory that contains a subvolume inside it, since\nthe log replay code is not prepared to deal with directory entries that\npoint to root items (only inode items).\n\n1) We have directories \"dir1\" (inode A) and \"dir2\" (inode B) under the\n   same parent directory;\n\n2) We have a file (inode C) under directory \"dir1\" (inode A);\n\n3) We have a subvolume inside directory \"dir2\" (inode B);\n\n4) All these inodes were persisted in a past transaction and we are\n   currently at transaction N;\n\n5) We rename the file (inode C), so at btrfs_log_new_name() we update\n   inode C\u0027s last_unlink_trans to N;\n\n6) We get a rename exchange for \"dir1\" (inode A) and \"dir2\" (inode B),\n   so after the exchange \"dir1\" is inode B and \"dir2\" is inode A.\n   During the rename exchange we call btrfs_log_new_name() for inodes\n   A and B, but because they are directories, we don\u0027t update their\n   last_unlink_trans to N;\n\n7) An fsync against the file (inode C) is done, and because its inode\n   has a last_unlink_trans with a value of N we log its parent directory\n   (inode A) (through btrfs_log_all_parents(), called from\n   btrfs_log_inode_parent()).\n\n8) So we end up with inode B not logged, which now has the old name\n   of inode A. At copy_inode_items_to_log(), when logging inode A, we\n   did not check if we had any conflicting inode to log because inode\n   A has a generation lower than the current transaction (created in\n   a past transaction);\n\n9) After a power failure, when replaying the log tree, since we find that\n   inode A has a new name that conflicts with the name of inode B in the\n   fs tree, we attempt to delete inode B... this is wrong since that\n   directory was never deleted before the power failure, and because there\n   is a subvolume inside that directory, attempting to delete it will fail\n   since replay_dir_deletes() and btrfs_unlink_inode() are not prepared\n   to deal with dir items that point to roots instead of inodes.\n\n   When that happens the mount fails and we get a stack trace like the\n   following:\n\n   [87.2314] BTRFS info (device dm-0): start tree-log replay\n   [87.2318] BTRFS critical (device dm-0): failed to delete reference to subvol, root 5 inode 256 parent 259\n   [87.2332] ------------[ cut here ]------------\n   [87.2338] BTRFS: Transaction aborted (error -2)\n   [87.2346] WARNING: CPU: 1 PID: 638968 at fs/btrfs/inode.c:4345 __btrfs_unlink_inode+0x416/0x440 [btrfs]\n   [87.2368] Modules linked in: btrfs loop dm_thin_pool (...)\n   [87.2470] CPU: 1 UID: 0 PID: 638968 Comm: mount Tainted: G        W           6.18.0-rc7-btrfs-next-218+ #2 PREEMPT(full)\n   [87.2489] Tainted: [W]=WARN\n   [87.2494] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-0-gea1b7a073390-prebuilt.qemu.org 04/01/2014\n   [87.2514] RIP: 0010:__btrfs_unlink_inode+0x416/0x440 [btrfs]\n   [87.2538] Code: c0 89 04 24 (...)\n   [87.2568] RSP: 0018:ffffc0e741f4b9b8 EFLAGS: 00010286\n   [87.2574] RAX: 0000000000000000 RBX: ffff9d3ec8a6cf60 RCX: 0000000000000000\n   [87.2582] RDX: 0000000000000002 RSI: ffffffff84ab45a1 RDI: 00000000ffffffff\n   [87.2591] RBP: ffff9d3ec8a6ef20 R08: 0000000000000000 R09: ffffc0e741f4b840\n   [87.2599] R10: ffff9d45dc1fffa8 R11: 0000000000000003 R12: ffff9d3ee26d77e0\n   [87.2608] R13: ffffc0e741f4ba98 R14: ffff9d4458040800 R15: ffff9d44b6b7ca10\n   [87.2618] FS:  00007f7b9603a840(0000) GS:ffff9d4658982000(0000) knlGS:0000000000000000\n   [87.\n---truncated---"
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              "value": "AV:N - A remote attacker can reach the Btrfs rename and fsync paths through a Btrfs-backed writable ksmbd share using SMB2 RENAME and FLUSH requests. Multiple ordinary renames can perform the required exchange without RENAME_EXCHANGE support.\nAC:L - The attacker controls the complete rename and fsync sequence, with no race, heap layout, or probabilistic memory condition to overcome. The state can be recreated repeatedly so it remains pending when an unclean shutdown occurs.\nPR:N - ksmbd supports unauthenticated guest sessions, making the sequence reachable without credentials on a guest-writable share. No Linux capability is checked after the guest has ordinary delete and write access to the shared directory.\nUI:N - No victim action is required while the attacker constructs and persists the inconsistent log. Log replay normally occurs automatically during the next boot or mount after an unclean shutdown.\nS:U - The vulnerable logging and recovery operations affect resources managed by the same host kernel and Btrfs filesystem. No virtualization, IOMMU, or other security-authority boundary is crossed.\nC:N - The flaw neither reads attacker-selected memory nor discloses filesystem or kernel data. The affected paths contain no use-after-free, out-of-bounds access, or other memory-corruption primitive.\nI:H - Replay can incorrectly unlink a legitimate conflicting directory and recursively orphan its ordinary contents, allowing severe filesystem data loss. The attacker controls the conflicting names and inode arrangement used by replay.\nA:H - If the wrongly removed directory contains a subvolume, replay aborts its transaction and the entire Btrfs filesystem fails to mount. This makes all data and services dependent on that filesystem unavailable."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: smbus: reject oversized block transfers in the common path\n\nThe SMBus block transfer length data-\u003eblock[0] is validated in\ni2c_smbus_xfer_emulated() but that check runs too late for tracepoints\nand is skipped entirely when the adapter provides a native smbus_xfer\nimplementation. This allows user-controlled oversized block lengths to\nreach tracepoint memcpy calls and driver callbacks unchecked.\n\nAdd an early validation in __i2c_smbus_xfer() that rejects block\ntransfers whose caller-supplied length is zero or exceeds\nI2C_SMBUS_BLOCK_MAX before any tracepoint fires or driver callback\nruns. data-\u003eblock[0] is filled in by the device on SMBus block reads,\nso the check is scoped to operations where the length is actually\nsupplied by the caller. This is consistent with the existing -EINVAL\nconvention in the emulated path and protects all downstream consumers\nat once: the smbus_write tracepoint, all native smbus_xfer driver\nimplementations, and the emulated path.\n\nTwo distinct bugs are fixed by this change:\n\nBug 1: smbus_write tracepoint OOB (include/trace/events/smbus.h)\n  trace_smbus_write() fires before any validation and copies\n  data-\u003eblock[0]+1 bytes into a 34-byte event buffer. With\n  block[0]=0xfe the tracepoint copies 255 bytes, overflowing by 221.\n\n BUG: KASAN: stack-out-of-bounds in trace_event_raw_event_smbus_write+0x27c/0x530\n Read of size 255 at addr ffff88800d98fcf8 by task poc_smbus/91\n Call Trace:\n  \u003cTASK\u003e\n  __asan_memcpy+0x23/0x80\n  trace_event_raw_event_smbus_write+0x27c/0x530\n  __i2c_smbus_xfer+0x43a/0xa40\n  i2c_smbus_xfer+0x19e/0x340\n  i2cdev_ioctl_smbus+0x38f/0x7f0\n  i2cdev_ioctl+0x35e/0x680\n  __x64_sys_ioctl+0x147/0x1e0\n  do_syscall_64+0xcf/0x15a0\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n  \u003c/TASK\u003e\n\nBug 2: i2c-stub I2C_SMBUS_I2C_BLOCK_DATA OOB (drivers/i2c/i2c-stub.c)\n  stub_xfer() implements .smbus_xfer directly and only clamps\n  block[0] against 256-command, not I2C_SMBUS_BLOCK_MAX. With\n  block[0]=0xff and command=0 the loop accesses block[1+i] for\n  i up to 254, far past the 34-byte union.\n\n UBSAN: array-index-out-of-bounds in drivers/i2c/i2c-stub.c:223:44\n index 34 is out of range for type \u0027__u8 [34]\u0027\n Call Trace:\n  \u003cTASK\u003e\n  __ubsan_handle_out_of_bounds+0xd7/0x120\n  stub_xfer+0x1971/0x198f [i2c_stub]\n  __i2c_smbus_xfer+0x306/0xa40\n  i2c_smbus_xfer+0x19e/0x340\n  i2cdev_ioctl_smbus+0x38f/0x7f0\n  i2cdev_ioctl+0x35e/0x680\n  __x64_sys_ioctl+0x147/0x1e0\n  do_syscall_64+0xcf/0x15a0\n  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n  \u003c/TASK\u003e\n\nBoth traces reproduced on v7.0-rc6+i2c/for-current with KASAN+UBSAN."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: iscsi: Reserve a terminator byte for the login payload\n\niscsi_target_check_login_request() rejects a login PDU whose\nDataSegmentLength exceeds MAX_KEY_VALUE_PAIRS, but the test is \u0027\u003e\u0027 and\nlogin-\u003ereq_buf is allocated with exactly MAX_KEY_VALUE_PAIRS\nbytes. Since iscsit_get_login_rx() receives payload_length + padding\nbytes, where\n\n\tpadding = ((-payload_length) \u0026 3);\n\nany payload_length from 8189 to 8192 fills the whole 8192 byte\nbuffer. The write stays in bounds, but no byte is left for a NUL\nterminator.\n\nThe buffer is subsequently consumed as a C string. In the CHAP path\nchap_check_algorithm() calls kstrdup(a_str), and extract_param() calls\nstrstr(in_buf, pattern) followed by strlen_semi(), none of which take a\nlength. convert_null_to_semi() additionally rewrites every embedded NUL\nto \u0027;\u0027, so even a payload made of well formed NUL separated key=value\nrecords is left without a terminator. These walk past the end of the\nobject into adjacent slab memory. It is reachable by an unauthenticated\ninitiator against a portal configured for CHAP; when authentication is\nnot required iscsi_login_zero_tsih_s2() rewrites AuthMethod to None and\nthe CHAP path is never entered.\n\nAllocate one extra byte. kzalloc() zeroes it and nothing ever writes to\nit, as every writer copies to offset 0 for at most MAX_KEY_VALUE_PAIRS\nbytes, so the buffer is always terminated."
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              "value": "AV:N - The LIO in-kernel iSCSI target accepts remote TCP connections on the iSCSI portal (typically port 3260); a crafted Login PDU is received by iscsit_accept_np()/iscsit_get_login_rx() and reaches the CHAP parsers over the network, the same exposure model as nfsd or ksmbd.\nAC:L - The attacker fully controls DataSegmentLength and the login payload. A CHAP_A PDU of 8189-8192 bytes with no NUL, or a second CHAP round where convert_null_to_semi() strips every terminator, makes kstrdup()/strstr() over-read adjacent slab deterministically; no race or victim-side layout is required.\nPR:N - The over-read runs in the CHAP login handshake before the password hash is checked, so no Linux account or capability is needed. Default TPG authentication is CHAP (TA_AUTHENTICATION=1), and chap_server_open() proceeds once target-side CHAP credentials exist, which is the normal CHAP deployment.\nUI:N - The attacker opens a TCP connection to the listening portal and sends the malicious Login PDUs; no victim user action such as mounting a volume or accepting a prompt is required.\nS:U - The unbounded C-string over-read and any resulting kernel oops stay inside the host iSCSI target\u0027s kernel security authority and do not by themselves cross a VM, IOMMU, or sandbox boundary.\nC:H - chap_check_algorithm() kstrdup()s the unterminated 8192-byte req_buf, and extract_param() uses unbounded strstr()/strlen_semi() after convert_null_to_semi() removes embedded NULs, producing an unbounded out-of-bounds read of adjacent kmalloc-8k slab that can disclose neighboring kernel objects.\nI:N - iscsit_get_login_rx() copies at most MAX_KEY_VALUE_PAIRS bytes into req_buf, so the network write stays in bounds; convert_null_to_semi() also writes only within payload_length. There is no out-of-bounds write or control-flow hijack primitive.\nA:H - strlen()/kstrdup()/strstr() walking past the kmalloc-8k login object into unmapped or guard pages causes a kernel oops, and the attacker can repeat the unauthenticated login against an exposed portal, denying service to the host and its iSCSI clients."
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