{"id":"CVE-2021-47356","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmISDN: fix possible use-after-free in HFC_cleanup()\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":"2026-03-15T22:43:11.750305Z","published":"2024-05-21T15:15:21.920Z","related":["ALSA-2024:4211","ALSA-2024:4352","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/7867ddc5f3de7f289aee63233afc0df4b62834c5"},{"type":"FIX","url":"https://git.kernel.org/stable/c/ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda"},{"type":"FIX","url":"https://git.kernel.org/stable/c/009fc857c5f6fda81f2f7dd851b2d54193a8e733"},{"type":"FIX","url":"https://git.kernel.org/stable/c/3ecd228c636ee17c14662729737fa07242a93cb0"},{"type":"FIX","url":"https://git.kernel.org/stable/c/49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe"},{"type":"FIX","url":"https://git.kernel.org/stable/c/54ff3202928952a100c477248e65ac6db01258a7"},{"type":"FIX","url":"https://git.kernel.org/stable/c/5f2818185da0fe82a932f0856633038b66faf124"},{"type":"FIX","url":"https://git.kernel.org/stable/c/b7ee9ae1e0cf55a037c4a99af2acc5d78cb7802d"},{"type":"FIX","url":"https://git.kernel.org/stable/c/61370ff07e0acc657559a8fac02551dfeb9d3020"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47356.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":"5.4.133"}]},{"events":[{"introduced":"5.5"},{"fixed":"5.10.51"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.12.18"}]},{"events":[{"introduced":"5.13"},{"fixed":"5.13.3"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"}]}