CVE-2026-98286

Что произошло

In the Linux kernel, the following vulnerability has been resolved: drop_monitor: use timer_shutdown_sync() to prevent timer rearming during teardown In drop_monitor teardown paths (net_dm_trace_off_set(), net_dm_hw_monitor_stop(), and error unwind paths in net_dm_trace_on_set() and net_dm_hw_monitor_start()), per-CPU timers are stopped using timer_delete_sync() followed by cancel_work_sync(). However, there is a circular dependency between send_timer and dm_alert_work: 1) sched_send_work() (timer callback) schedules dm_alert_work. 2) send_dm_alert() / net_dm_hw_summary_work() calls reset_per_cpu_data() or net_dm_hw_reset_per_cpu_data(). 3) If memory allocation fails under memory pressure in the reset function, it re-arms the timer via mod_timer(&data->send_timer, ...). If dm_alert_work is running concurrently while timer_delete_sync() executes on another CPU, an allocation failure in the worker will re-arm the timer after timer_delete_sync() has already returned. Once cancel_work_sync() completes and module_put() is called, the timer remains active in the timer wheel. If the module is then unloaded, the timer will fire and execute sched_send_work() in freed memory, triggering a kernel panic / use-after-free. Switch from timer_delete_sync() to timer_shutdown_sync(). This guarantees that any in-flight timer handler has finished and prevents subsequent re-arming attempts from running workers from succeeding. When monitoring is restarted later, timer_setup() is invoked, which cleanly re-initializes the timer.

Что делать

dpkg-query -W -f='${Package}	${Version}\n'

rpm -qa --qf '%{NAME}\t%{VERSION}-%{RELEASE}\n'

Get-HotFix | Select-Object HotFixID, InstalledOn

Продукты и затронутые версии

{
  "status": "affected",
  "version": "9398e9c0b1d44eeb700e9e766c02bcc765c82570",
  "lessThan": "9616b0c67fbd8cc0b49de7b26cdf2ab33747c80e",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "9398e9c0b1d44eeb700e9e766c02bcc765c82570",
  "lessThan": "bda4d9525fb91a2388ee09669421b8d505290864",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "9398e9c0b1d44eeb700e9e766c02bcc765c82570",
  "lessThan": "c391a40f71886b28c082b47270f0e856fa3e1150",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "2514c7ad115e762562c7bdd58bb1ab3425a98245",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "439b1164da3612ec7e186e1dc314471e7190bfc7",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "5.10.27",
  "lessThan": "5.11",
  "versionType": "semver"
}

{
  "status": "affected",
  "version": "5.11.11",
  "lessThan": "5.12",
  "versionType": "semver"
}

{
  "status": "affected",
  "version": "5.12"
}

{
  "status": "unaffected",
  "version": "0",
  "lessThan": "5.12",
  "versionType": "semver"
}

{
  "status": "unaffected",
  "version": "6.18.54",
  "versionType": "semver",
  "lessThanOrEqual": "6.18.*"
}

{
  "status": "unaffected",
  "version": "7.2.8",
  "versionType": "semver",
  "lessThanOrEqual": "7.2.*"
}

{
  "status": "unaffected",
  "version": "7.3",
  "versionType": "original_commit_for_fix",
  "lessThanOrEqual": "*"
}

CVSS: оценки и векторы

Оценка CVSS отсутствует.

Источники и ссылки

{
  "cwes": [],
  "epss": {
    "source": "epss",
    "received_at": "2026-11-03T21:16:05.831146+00:00"
  },
  "title": {
    "source": "cve",
    "received_at": "2026-10-28T20:15:08.271804+00:00"
  },
  "scores": [],
  "status": {
    "source": "cve",
    "received_at": "2026-10-28T20:15:08.271804+00:00"
  },
  "affected": [
    "cve"
  ],
  "published": {
    "source": "cve",
    "received_at": "2026-10-28T20:15:08.271804+00:00"
  },
  "solutions": [],
  "percentile": {
    "source": "epss",
    "received_at": "2026-11-03T21:16:05.831146+00:00"
  },
  "references": [
    "cve"
  ],
  "description": {
    "source": "cve",
    "received_at": "2026-10-28T20:15:08.271804+00:00"
  },
  "workarounds": [],
  "configurations": []
}

Хронология записи

1. Данные обновлены04.11.2026, 00:16
2. Данные обновлены03.11.2026, 00:15
3. Данные обновлены02.11.2026, 00:13
4. Данные обновлены31.10.2026, 12:00
5. Данные обновлены29.10.2026, 12:47
6. Опубликована28.10.2026, 23:15

Личная заметка и статус

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