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Vulnerability record · CVE-2026-53381 · published 19 July 2026

CVE-2026-53381: Linux kernel use after free vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.14% · top 97.3% CWE-416 · Use after free
7.8CVSS 3.1 base score
0.14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
9References
17 Aug 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/06b41351779e9289e8785694ade9042ae85e41ea Patch
https://git.kernel.org/stable/c/0b809199ff87c44487e516a725dd4be2185712ce Patch
https://git.kernel.org/stable/c/1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e Patch
https://git.kernel.org/stable/c/2181a09ba980f142650fb053666350ead4471cfe Patch
https://git.kernel.org/stable/c/2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9 Patch
https://git.kernel.org/stable/c/39a2b95e008665c14f84e50ed411d898df7cd11b Patch
https://git.kernel.org/stable/c/607a1d4c42f649e6197567c0448fd9ebb316cd42 Patch
https://git.kernel.org/stable/c/97c4691653d145dcc699eca5d3aba3219a520f1f Patch
https://git.kernel.org/stable/c/e09412a714bcd49375198427bb4aa005037a9d6f Patch

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Source: NIST National Vulnerability Database (record CVE-2026-53381), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.