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CVE-2023-53815

UnknownEPSS 0.16%

Last modified

CVE-2023-53815 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 0.16% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability
0.16%

5.7th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= ec8f954a40da8cd3d159713b608e901f0cd909a9, < f1be1ed32daa053484222f7f9beb2b16c624dffd; >= ec8f954a40da8cd3d159713b608e901f0cd909a9, < 0670c4c567b27bd8f999a943028f4fe60d1a1106; >= ec8f954a40da8cd3d159713b608e901f0cd909a9, < e7aff15ba29ba4b3052786b1636fa5c4aa39e179; >= ec8f954a40da8cd3d159713b608e901f0cd909a9, < f9bd298e3e4d3fd6e19f017789a42d0f332cd555; >= ec8f954a40da8cd3d159713b608e901f0cd909a9, < c1968bb8a28625cc95d2ad3ca872ab98c9c36d59; >= ec8f954a40da8cd3d159713b608e901f0cd909a9, < 9d9e522010eb5685d8b53e8a24320653d9d4cbbf
LinuxLinux5.4

References

Timeline

Published
Last Modified
Status
Deferred

Frequently Asked Questions

What is 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.
How severe is CVE-2023-53815?
Severity scoring for CVE-2023-53815 is pending analysis. The EPSS model estimates a 0.16% probability of exploitation in the next 30 days.
How do I fix CVE-2023-53815?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST