CVE-2023-53815
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.
Affected versions
Linux kernel versions
5.4
and later are affected. Fixed in
5.10.188,
5.15.121,
6.1.39,
6.3.13,
6.4.4,
6.5
and their respective stable series.
References
The following references provide additional information about CVE-2023-53815 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/0670c4c567b27bd8f999a943028f4fe60d1a1106
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PatchKernel patch commithttps://git.kernel.org/stable/c/9d9e522010eb5685d8b53e8a24320653d9d4cbbf
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PatchKernel patch commithttps://git.kernel.org/stable/c/c1968bb8a28625cc95d2ad3ca872ab98c9c36d59
Frequently asked questions
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What is CVE-2023-53815?
CVE-2023-53815 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.4 onward and has been patched in 5.10.188, 5.15.121, 6.1.39 and others. CVE-2023-53815 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2023-53815?
Yes — CVE-2023-53815 has been patched. Fixed versions include 5.10.188, 5.15.121, 6.1.39 and others. If you are running Linux kernel 5.4 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2023-53815 actively exploited?
No — CVE-2023-53815 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.