{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-53815","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-12-08T23:58:35.277Z","datePublished":"2025-12-09T00:01:12.832Z","dateUpdated":"2026-05-11T19:52:03.416Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T19:52:03.416Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nposix-timers: Prevent RT livelock in itimer_delete()\n\nitimer_delete() has a retry loop when the timer is concurrently expired. On\nnon-RT kernels this just spin-waits until the timer callback has completed,\nexcept for posix CPU timers which have HAVE_POSIX_CPU_TIMERS_TASK_WORK\nenabled.\n\nIn that case and on RT kernels the existing task could live lock when\npreempting the task which does the timer delivery.\n\nReplace spin_unlock() with an invocation of timer_wait_running() to handle\nit the same way as the other retry loops in the posix timer code."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/time/posix-timers.c"],"versions":[{"version":"ec8f954a40da8cd3d159713b608e901f0cd909a9","lessThan":"f1be1ed32daa053484222f7f9beb2b16c624dffd","status":"affected","versionType":"git"},{"version":"ec8f954a40da8cd3d159713b608e901f0cd909a9","lessThan":"0670c4c567b27bd8f999a943028f4fe60d1a1106","status":"affected","versionType":"git"},{"version":"ec8f954a40da8cd3d159713b608e901f0cd909a9","lessThan":"e7aff15ba29ba4b3052786b1636fa5c4aa39e179","status":"affected","versionType":"git"},{"version":"ec8f954a40da8cd3d159713b608e901f0cd909a9","lessThan":"f9bd298e3e4d3fd6e19f017789a42d0f332cd555","status":"affected","versionType":"git"},{"version":"ec8f954a40da8cd3d159713b608e901f0cd909a9","lessThan":"c1968bb8a28625cc95d2ad3ca872ab98c9c36d59","status":"affected","versionType":"git"},{"version":"ec8f954a40da8cd3d159713b608e901f0cd909a9","lessThan":"9d9e522010eb5685d8b53e8a24320653d9d4cbbf","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/time/posix-timers.c"],"versions":[{"version":"5.4","status":"affected"},{"version":"0","lessThan":"5.4","status":"unaffected","versionType":"semver"},{"version":"5.10.188","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.121","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.39","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.3.13","lessThanOrEqual":"6.3.*","status":"unaffected","versionType":"semver"},{"version":"6.4.4","lessThanOrEqual":"6.4.*","status":"unaffected","versionType":"semver"},{"version":"6.5","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.10.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.15.121"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.1.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.3.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.4.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"6.5"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/f1be1ed32daa053484222f7f9beb2b16c624dffd"},{"url":"https://git.kernel.org/stable/c/0670c4c567b27bd8f999a943028f4fe60d1a1106"},{"url":"https://git.kernel.org/stable/c/e7aff15ba29ba4b3052786b1636fa5c4aa39e179"},{"url":"https://git.kernel.org/stable/c/f9bd298e3e4d3fd6e19f017789a42d0f332cd555"},{"url":"https://git.kernel.org/stable/c/c1968bb8a28625cc95d2ad3ca872ab98c9c36d59"},{"url":"https://git.kernel.org/stable/c/9d9e522010eb5685d8b53e8a24320653d9d4cbbf"}],"title":"posix-timers: Prevent RT livelock in itimer_delete()","x_generator":{"engine":"bippy-1.2.0"}}}}