CVE-2026-89831
In the Linux kernel, the following vulnerability has been resolved: f2fs: protect critical_task_priority updates with s_umount The sysfs store path already takes s_umount for GC thread control entries, and ckpt_thread_ioprio is covered as well. critical_task_priority also updates checkpoint or GC kthread scheduling state, but it is not covered by that serialization. It can race with remount or teardown paths that are stopping those threads. Protect critical_task_priority sysfs writes with s_umount too.
Affected versions
Linux kernel versions
7.0
and later are affected. Fixed in
7.2.5,
7.3-rc1
and their respective stable series.
References
2 totalFrequently asked questions
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What is CVE-2026-89831?
CVE-2026-89831 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 7.0 onward and has been patched in 7.2.5 and 7.3-rc1. CVE-2026-89831 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-2026-89831?
Yes. CVE-2026-89831 has been patched. Fixed versions include 7.2.5 and 7.3-rc1. If you are running Linux kernel 7.0 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-89831 actively exploited?
No. CVE-2026-89831 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.