{"id":"CVE-2021-20317","details":"A flaw was found in the Linux kernel. A corrupted timer tree caused the task wakeup to be missing in the timerqueue_add function in lib/timerqueue.c. This flaw allows a local attacker with special user privileges to cause a denial of service, slowing and eventually stopping the system while running OSP.","modified":"2026-03-13T00:46:41.570877Z","published":"2021-09-27T11:15:07.357Z","related":["ALSA-2021:4647"],"references":[{"type":"WEB","url":"https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf"},{"type":"ADVISORY","url":"https://www.debian.org/security/2022/dsa-5096"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2005258"},{"type":"FIX","url":"https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=511885d7061eda3eb1faf3f57dcc936ff75863f1"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-20317.json","unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"5.4"}]},{"events":[{"introduced":"0"},{"last_affected":"5.4-NA"}]},{"events":[{"introduced":"0"},{"last_affected":"9.0"}]},{"events":[{"introduced":"0"},{"last_affected":"10.0"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H"}]}