{"schema":"threatline.record/2","record":{"id":"CVE-2026-98286","aliases":[],"summary":"drop_monitor: use timer_shutdown_sync() to prevent timer rearming during teardown","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrop_monitor: use timer_shutdown_sync() to prevent timer rearming during teardown\n\nIn drop_monitor teardown paths (net_dm_trace_off_set(),\nnet_dm_hw_monitor_stop(), and error unwind paths in net_dm_trace_on_set()\nand net_dm_hw_monitor_start()), per-CPU timers are stopped using\ntimer_delete_sync() followed by cancel_work_sync().\n\nHowever, there is a circular dependency between send_timer and\ndm_alert_work:\n1) sched_send_work() (timer callback) schedules dm_alert_work.\n2) send_dm_alert() / net_dm_hw_summary_work() calls reset_per_cpu_data()\n   or net_dm_hw_reset_per_cpu_data().\n3) If memory allocation fails under memory pressure in the reset\n   function, it re-arms the timer via mod_timer(&data->send_timer, ...).\n\nIf dm_alert_work is running concurrently while timer_delete_sync()\nexecutes on another CPU, an allocation failure in the worker will\nre-arm the timer after timer_delete_sync() has already returned.\nOnce cancel_work_sync() completes and module_put() is called, the timer\nremains active in the timer wheel. If the module is then unloaded, the\ntimer will fire and execute sched_send_work() in freed memory,\ntriggering a kernel panic / use-after-free.\n\nSwitch from timer_delete_sync() to timer_shutdown_sync(). This guarantees\nthat any in-flight timer handler has finished and prevents subsequent\nre-arming attempts from running workers from succeeding. When monitoring\nis restarted later, timer_setup() is invoked, which cleanly\nre-initializes the timer.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98286","source_modified_at":"2026-10-19T09:16:57.641Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"9398e9c0b1d44eeb700e9e766c02bcc765c82570","lessThan":"9616b0c67fbd8cc0b49de7b26cdf2ab33747c80e","status":"affected","versionType":"git"},{"version":"9398e9c0b1d44eeb700e9e766c02bcc765c82570","lessThan":"bda4d9525fb91a2388ee09669421b8d505290864","status":"affected","versionType":"git"},{"version":"9398e9c0b1d44eeb700e9e766c02bcc765c82570","lessThan":"c391a40f71886b28c082b47270f0e856fa3e1150","status":"affected","versionType":"git"},{"version":"2514c7ad115e762562c7bdd58bb1ab3425a98245","status":"affected","versionType":"git"},{"version":"439b1164da3612ec7e186e1dc314471e7190bfc7","status":"affected","versionType":"git"},{"version":"5.10.27","lessThan":"5.11","status":"affected","versionType":"semver"},{"version":"5.11.11","lessThan":"5.12","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98286","source_modified_at":"2026-10-19T09:16:57.641Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"5.12","status":"affected"},{"version":"0","lessThan":"5.12","status":"unaffected","versionType":"semver"},{"version":"6.18.54","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.8","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98286","source_modified_at":"2026-10-19T09:16:57.641Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"9616b0c67fbd8cc0b49de7b26cdf2ab33747c80e","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98286","source_modified_at":"2026-10-19T09:16:57.641Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"5.11","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98286","source_modified_at":"2026-10-19T09:16:57.641Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"5.12","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00173,"percentile":0.06448,"score_date":"2026-10-23"},"published_at":"2026-10-06T08:45:47.167Z","modified_at":"2026-10-19T09:16:57.641Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98286","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:16:57.641Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98286","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/9616b0c67fbd8cc0b49de7b26cdf2ab33747c80e"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/bda4d9525fb91a2388ee09669421b8d505290864"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/c391a40f71886b28c082b47270f0e856fa3e1150"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:16:57.641Z","content_hash":"f8776458b017df8cb26abbc5df861e80d3e35a446d728809d7acf3ff301d46cc"}}