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CVE-2026-53381

HIGHCVSS 7.8/10EPSS 0.14%

Last modified

CVE-2026-53381 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 0.14% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.14%

4.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

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

VendorProductVersions
LinuxLinux>= 548e1f2bac1d4df91a6138f26bb4ab00323fd948, < 607a1d4c42f649e6197567c0448fd9ebb316cd42; >= cfd1aa3e2b71f3327cb373c45a897c9028c62b35, < 1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e; >= 83b375c6efef69b1066ad2d79601221e7892745a, < 0b809199ff87c44487e516a725dd4be2185712ce; >= bfd17b6138df0122a95989457d8e18ce0b86165e, < 2181a09ba980f142650fb053666350ead4471cfe; >= b26923512dbe57ae4917bafd31396d22a9d1691a, < 97c4691653d145dcc699eca5d3aba3219a520f1f; >= 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01, < 2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9; >= 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01, < 39a2b95e008665c14f84e50ed411d898df7cd11b; >= 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01, < e09412a714bcd49375198427bb4aa005037a9d6f; >= 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01, < 06b41351779e9289e8785694ade9042ae85e41ea; f19a1390af448d9e193c08e28ea5f727bf3c3049; >= 5.10.246, < 5.10.260; >= 5.15.196, < 5.15.211; >= 6.1.158, < 6.1.177; >= 6.6.115, < 6.6.144; >= 6.12.54, < 6.12.95; >= 6.17.4, < 6.18
LinuxLinux6.18

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is 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.
How severe is CVE-2026-53381?
CVE-2026-53381 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.14% probability of exploitation in the next 30 days.
How do I fix CVE-2026-53381?
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