{"id":"CVE-2021-47324","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nwatchdog: Fix possible use-after-free in wdt_startup()\n\nThis module's remove path calls del_timer(). However, that function\ndoes not wait until the timer handler finishes. This means that the\ntimer handler may still be running after the driver's remove function\nhas finished, which would result in a use-after-free.\n\nFix by calling del_timer_sync(), which makes sure the timer handler\nhas finished, and unable to re-schedule itself.","modified":"2026-03-15T22:43:11.864694Z","published":"2024-05-21T15:15:19.543Z","related":["SUSE-SU-2024:1978-1","SUSE-SU-2024:1979-1","SUSE-SU-2024:1983-1","SUSE-SU-2024:2010-1","SUSE-SU-2024:2183-1","SUSE-SU-2024:2184-1","SUSE-SU-2024:2185-1"],"references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/862f2b5a7c38762ac9e369daefbf361a91aca685"},{"type":"FIX","url":"https://git.kernel.org/stable/c/8adbbe6c86bb13e14f8a19e036ae5f4f5661fd90"},{"type":"FIX","url":"https://git.kernel.org/stable/c/a397cb4576fc2fc802562418b3a50b8f67d60d31"},{"type":"FIX","url":"https://git.kernel.org/stable/c/b4ebf4a4692e84163a69444c70ad515de06e2259"},{"type":"FIX","url":"https://git.kernel.org/stable/c/c08a6b31e4917034f0ed0cb457c3bb209576f542"},{"type":"FIX","url":"https://git.kernel.org/stable/c/0ac50a76cf3cd63db000648b3b19f3f98b8aaa76"},{"type":"FIX","url":"https://git.kernel.org/stable/c/146cc288fb80c662c9c35e7bc58325d1ac0a7875"},{"type":"FIX","url":"https://git.kernel.org/stable/c/dc9403097be52d57a5c9c35efa9be79d166a78af"},{"type":"FIX","url":"https://git.kernel.org/stable/c/63a3dc24bd053792f84cb4eef0168b1266202a02"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"4.4.276"}]},{"events":[{"introduced":"4.5"},{"fixed":"4.9.276"}]},{"events":[{"introduced":"4.10"},{"fixed":"4.14.240"}]},{"events":[{"introduced":"4.15"},{"fixed":"4.19.198"}]},{"events":[{"introduced":"4.20"},{"fixed":"5.4.134"}]},{"events":[{"introduced":"5.5"},{"fixed":"5.10.52"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.12.19"}]},{"events":[{"introduced":"5.13"},{"fixed":"5.13.4"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47324.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}