CVE-2026-53381
virtiofs: fix UAF on submount umount
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Jul 19, 2026 |
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Affected Versions
Linux / Linux
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
Linux / Linux
6.18
References
git.kernel.org: https://git.kernel.org/stable/c/607a1d4c42f649e6197567c0448fd9ebb316cd42 git.kernel.org: https://git.kernel.org/stable/c/1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e git.kernel.org: https://git.kernel.org/stable/c/0b809199ff87c44487e516a725dd4be2185712ce git.kernel.org: https://git.kernel.org/stable/c/2181a09ba980f142650fb053666350ead4471cfe git.kernel.org: https://git.kernel.org/stable/c/97c4691653d145dcc699eca5d3aba3219a520f1f git.kernel.org: https://git.kernel.org/stable/c/2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9 git.kernel.org: https://git.kernel.org/stable/c/39a2b95e008665c14f84e50ed411d898df7cd11b git.kernel.org: https://git.kernel.org/stable/c/e09412a714bcd49375198427bb4aa005037a9d6f git.kernel.org: https://git.kernel.org/stable/c/06b41351779e9289e8785694ade9042ae85e41ea