CVE-2026-74264 (GCVE-0-2026-74264)
Vulnerability from cvelistv5
Published
2026-08-15 05:57
Modified
2026-10-21 12:45
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: watchdog: fix refcount tracking races Blamed commit converted the untracked dev_hold()/dev_put() calls in the watchdog code to use the tracked dev_hold_track()/dev_put_track() (which were later renamed/interfaced to netdev_hold() and netdev_put()). By introducing dev->watchdog_dev_tracker to store the reference tracking information without adding synchronization between netdev_watchdog_up() and dev_watchdog(), it enabled the race condition where this pointer could be overwritten or freed concurrently, leading to the list corruption crash syzbot reported: list_del corruption, ffff888114a18c00->next is NULL kernel BUG at lib/list_debug.c:52 ! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 1 UID: 0 PID: 91 Comm: kworker/u8:5 Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Workqueue: events_unbound linkwatch_event RIP: 0010:__list_del_entry_valid_or_report.cold+0x22/0x2a lib/list_debug.c:52 Call Trace: <TASK> __list_del_entry_valid include/linux/list.h:132 [inline] __list_del_entry include/linux/list.h:246 [inline] list_move_tail include/linux/list.h:341 [inline] ref_tracker_free+0x1a7/0x6c0 lib/ref_tracker.c:329 netdev_tracker_free include/linux/netdevice.h:4491 [inline] netdev_put include/linux/netdevice.h:4508 [inline] netdev_put include/linux/netdevice.h:4504 [inline] netdev_watchdog_down net/sched/sch_generic.c:600 [inline] dev_deactivate_many+0x28c/0xfe0 net/sched/sch_generic.c:1363 dev_deactivate+0x109/0x1d0 net/sched/sch_generic.c:1397 linkwatch_do_dev net/core/link_watch.c:184 [inline] linkwatch_do_dev+0xd3/0x120 net/core/link_watch.c:166 __linkwatch_run_queue+0x3a5/0x810 net/core/link_watch.c:240 linkwatch_event+0x8f/0xc0 net/core/link_watch.c:314 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3314 process_scheduled_works kernel/workqueue.c:3397 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x69a/0xc80 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 This patch has three coordinated parts: 1) Add dev->watchdog_lock and dev->watchdog_ref_held to serialize watchdog operations. 2) Remove netdev_watchdog_up() call from netif_carrier_on(): This ensures netdev_watchdog_up() is only called from process/BH context (via linkwatch workqueue dev_activate()), allowing us to use spin_lock_bh() for synchronization. 3) Synchronize watchdog up and watchdog timer: Protect netdev_watchdog_up() with tx_global_lock and watchdog_lock. Only allocate a new tracker in netdev_watchdog_up() if one is not already present. In dev_watchdog(), ensure we don't release the tracker if the timer was rescheduled either by dev_watchdog() itself or concurrently by netdev_watchdog_up().
References
Impacted products
Vendor Product Version
Linux Linux Version: f12bf6f3f942b37de65eeea8be25903587fec930
Version: f12bf6f3f942b37de65eeea8be25903587fec930
Version: f12bf6f3f942b37de65eeea8be25903587fec930
Version: f12bf6f3f942b37de65eeea8be25903587fec930
Version: f12bf6f3f942b37de65eeea8be25903587fec930
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1 UID: 0 PID: 91 Comm: kworker/u8:5 Not tainted syzkaller #0 PREEMPT(lazy)\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026\\nWorkqueue: events_unbound linkwatch_event\\n RIP: 0010:__list_del_entry_valid_or_report.cold+0x22/0x2a lib/list_debug.c:52\\nCall Trace:\\n \u003cTASK\u003e\\n  __list_del_entry_valid include/linux/list.h:132 [inline]\\n  __list_del_entry include/linux/list.h:246 [inline]\\n  list_move_tail include/linux/list.h:341 [inline]\\n  ref_tracker_free+0x1a7/0x6c0 lib/ref_tracker.c:329\\n  netdev_tracker_free include/linux/netdevice.h:4491 [inline]\\n  netdev_put include/linux/netdevice.h:4508 [inline]\\n  netdev_put include/linux/netdevice.h:4504 [inline]\\n  netdev_watchdog_down net/sched/sch_generic.c:600 [inline]\\n  dev_deactivate_many+0x28c/0xfe0 net/sched/sch_generic.c:1363\\n  dev_deactivate+0x109/0x1d0 net/sched/sch_generic.c:1397\\n  linkwatch_do_dev net/core/link_watch.c:184 [inline]\\n  linkwatch_do_dev+0xd3/0x120 net/core/link_watch.c:166\\n  __linkwatch_run_queue+0x3a5/0x810 net/core/link_watch.c:240\\n  linkwatch_event+0x8f/0xc0 net/core/link_watch.c:314\\n  process_one_work+0xa0e/0x1980 kernel/workqueue.c:3314\\n  process_scheduled_works kernel/workqueue.c:3397 [inline]\\n  worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478\\n  kthread+0x370/0x450 kernel/kthread.c:436\\n  ret_from_fork+0x69a/0xc80 arch/x86/kernel/process.c:158\\n  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\\n\\nThis patch has three coordinated parts:\\n\\n1) Add dev-\u003ewatchdog_lock and dev-\u003ewatchdog_ref_held to serialize watchdog operations.\\n\\n2) Remove netdev_watchdog_up() call from netif_carrier_on():\\n   This ensures netdev_watchdog_up() is only called from process/BH context\\n   (via linkwatch workqueue dev_activate()), allowing us to use\\n   spin_lock_bh() for synchronization.\\n\\n3) Synchronize watchdog up and watchdog timer:\\n   Protect netdev_watchdog_up() with tx_global_lock and watchdog_lock.\\n   Only allocate a new tracker in netdev_watchdog_up() if one is\\n   not already present.\\n   In dev_watchdog(), ensure we don\u0027t release the tracker if the\\n   timer was rescheduled either by dev_watchdog() itself or concurrently\\n   by netdev_watchdog_up().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.160\", \"versionStartIncluding\": \"5.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.114\", \"versionStartIncluding\": \"5.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.40\", \"versionStartIncluding\": \"5.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.5\", \"versionStartIncluding\": \"5.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"5.17\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-10-21T12:45:11.896Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-74264\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-21T12:45:11.896Z\", \"dateReserved\": \"2026-08-15T05:44:03.877Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-15T05:57:40.314Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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