{
  "cveId": "CVE-2026-98286",
  "url": "https://patchblox.com/security/cve/CVE-2026-98286",
  "summary": "CVE-2026-98286 is fixed in linux on 1 platform by DEBIAN-CVE-2026-98286 (version 7.2.8-1), released October 6, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "drop_monitor: use timer_shutdown_sync() to prevent timer rearming during teardown",
  "description": "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(\u0026data-\u003Esend_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.",
  "published": "2026-10-06T09:18:18Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "epss": 0.00166,
  "epssPercentile": 0.05863,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98286",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.8-1",
      "fix": "DEBIAN-CVE-2026-98286",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98286",
      "released": "2026-10-06T21:56:27Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}