{"id":"CVE-2021-47321","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nwatchdog: Fix possible use-after-free by calling del_timer_sync()\n\nThis driver'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":"2026-03-15T22:43:11.140140Z","published":"2024-05-21T15:15:19.297Z","related":["ALSA-2024:7000","ALSA-2024:7001","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/db222f1477ad5692cd454709b714949807e5d111"},{"type":"FIX","url":"https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a"},{"type":"FIX","url":"https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e"},{"type":"FIX","url":"https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4"},{"type":"FIX","url":"https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270"},{"type":"FIX","url":"https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf"},{"type":"FIX","url":"https://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3"},{"type":"FIX","url":"https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d"},{"type":"FIX","url":"https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47321.json","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":"5.12.9"}]},{"events":[{"introduced":"5.13"},{"fixed":"5.13.4"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}