CVE-2026-53381
In the Linux kernel, the following vulnerability has been resolved: virtiofs: fix UAF on submount umount iput() called from fuse_release_end() can Oops if the super block has already been destroyed. Normally this is prevented by waiting for num_waiting to go down to zero before commencing with super block shutdown. This only works, however, for the last submount instance, as the wait counter is per connection, not per superblock. Revert to using synchronous release requests for the auto_submounts case, which is virtiofs only at this time.
Affected versions
Linux kernel versions
5.10.246,
5.15.196,
6.1.158,
6.6.115,
6.12.54,
6.17.4,
6.18
and later are affected. Fixed in
5.10.260,
5.15.211,
6.1.177,
6.6.144,
6.12.95,
6.18.37,
7.0.14,
7.1.2,
7.2-rc1
and their respective stable series.
References
9 totalFrequently asked questions
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What is CVE-2026-53381?
CVE-2026-53381 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.10.246 onward and has been patched in 5.10.260, 5.15.211, 6.1.177 and others. CVE-2026-53381 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-2026-53381?
Yes — CVE-2026-53381 has been patched. Fixed versions include 5.10.260, 5.15.211, 6.1.177 and others. If you are running Linux kernel 5.10.246 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-53381 actively exploited?
No — CVE-2026-53381 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.