GHSA-QPPF-XPG3-FXJQ
Vulnerability from github – Published: 2025-12-09 03:31 – Updated: 2025-12-09 03:31In the Linux kernel, the following vulnerability has been resolved:
posix-timers: Prevent RT livelock in itimer_delete()
itimer_delete() has a retry loop when the timer is concurrently expired. On non-RT kernels this just spin-waits until the timer callback has completed, except for posix CPU timers which have HAVE_POSIX_CPU_TIMERS_TASK_WORK enabled.
In that case and on RT kernels the existing task could live lock when preempting the task which does the timer delivery.
Replace spin_unlock() with an invocation of timer_wait_running() to handle it the same way as the other retry loops in the posix timer code.
{
"affected": [],
"aliases": [
"CVE-2023-53815"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-12-09T01:16:53Z",
"severity": null
},
"details": "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.",
"id": "GHSA-qppf-xpg3-fxjq",
"modified": "2025-12-09T03:31:11Z",
"published": "2025-12-09T03:31:11Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53815"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0670c4c567b27bd8f999a943028f4fe60d1a1106"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9d9e522010eb5685d8b53e8a24320653d9d4cbbf"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c1968bb8a28625cc95d2ad3ca872ab98c9c36d59"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e7aff15ba29ba4b3052786b1636fa5c4aa39e179"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f1be1ed32daa053484222f7f9beb2b16c624dffd"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f9bd298e3e4d3fd6e19f017789a42d0f332cd555"
}
],
"schema_version": "1.4.0",
"severity": []
}
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