CVE-2023-53815 (GCVE-0-2023-53815)

Vulnerability from cvelistv5 – Published: 2025-12-09 00:01 – Updated: 2025-12-09 00:01
VLAI?
Summary
In 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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ec8f954a40da8cd3d159713b608e901f0cd909a9 , < f1be1ed32daa053484222f7f9beb2b16c624dffd (git)
Affected: ec8f954a40da8cd3d159713b608e901f0cd909a9 , < 0670c4c567b27bd8f999a943028f4fe60d1a1106 (git)
Affected: ec8f954a40da8cd3d159713b608e901f0cd909a9 , < e7aff15ba29ba4b3052786b1636fa5c4aa39e179 (git)
Affected: ec8f954a40da8cd3d159713b608e901f0cd909a9 , < f9bd298e3e4d3fd6e19f017789a42d0f332cd555 (git)
Affected: ec8f954a40da8cd3d159713b608e901f0cd909a9 , < c1968bb8a28625cc95d2ad3ca872ab98c9c36d59 (git)
Affected: ec8f954a40da8cd3d159713b608e901f0cd909a9 , < 9d9e522010eb5685d8b53e8a24320653d9d4cbbf (git)
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    Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.10.188 , ≤ 5.10.* (semver)
Unaffected: 5.15.121 , ≤ 5.15.* (semver)
Unaffected: 6.1.39 , ≤ 6.1.* (semver)
Unaffected: 6.3.13 , ≤ 6.3.* (semver)
Unaffected: 6.4.4 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
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{
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          "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."
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        "dateUpdated": "2025-12-09T00:01:12.832Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2025-12-09T00:01:12.832Z",
    "dateReserved": "2025-12-08T23:58:35.277Z",
    "dateUpdated": "2025-12-09T00:01:12.832Z",
    "state": "PUBLISHED"
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  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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