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CVE-2026-53381

7.8 · HIGH

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.

Published Jul 19, 2026CWE-416EPSS 0.14%

Overview

CVE-2026-53381 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/06b41351779e9289e8785694ade9042ae85e41eaRefgit.kernel.org/stable/c/0b809199ff87c44487e516a725dd4be2185712ceRefgit.kernel.org/stable/c/1cc0e3a0c6499aaaa2f21a4fcbba388486afb25eRefgit.kernel.org/stable/c/2181a09ba980f142650fb053666350ead4471cfeRefgit.kernel.org/stable/c/2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9Refgit.kernel.org/stable/c/39a2b95e008665c14f84e50ed411d898df7cd11bRefgit.kernel.org/stable/c/607a1d4c42f649e6197567c0448fd9ebb316cd42Refgit.kernel.org/stable/c/97c4691653d145dcc699eca5d3aba3219a520f1fRefgit.kernel.org/stable/c/e09412a714bcd49375198427bb4aa005037a9d6f

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53381?

CVE-2026-53381 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-53381?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-53381?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-53381?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53381 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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