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CVE-2026-53381

virtiofs: fix UAF on submount umount

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.260, 5.15.211, 6.1.177, 6.6.144, 6.12.95, and 4 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 548e1f2bac1d4df91a6138f26bb4ab00323fd948 · fixed in 607a1d4c42f649e6197567c0448fd9ebb316cd42; From cfd1aa3e2b71f3327cb373c45a897c9028c62b35 · fixed in 1cc0e3a0c6499aaaa2f21a4fcbba388486afb25e; From 83b375c6efef69b1066ad2d79601221e7892745a · fixed in 0b809199ff87c44487e516a725dd4be2185712ce; From bfd17b6138df0122a95989457d8e18ce0b86165e · fixed in 2181a09ba980f142650fb053666350ead4471cfe; From b26923512dbe57ae4917bafd31396d22a9d1691a · fixed in 97c4691653d145dcc699eca5d3aba3219a520f1f; From 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01 · fixed in 2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9; From 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01 · fixed in 39a2b95e008665c14f84e50ed411d898df7cd11b; From 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01 · fixed in e09412a714bcd49375198427bb4aa005037a9d6f; From 26e5c67deb2e1f42a951f022fdf5b9f7eb747b01 · fixed in 06b41351779e9289e8785694ade9042ae85e41ea; From 5.10.246 · fixed in 5.10.260; From 5.15.196 · fixed in 5.15.211; From 6.1.158 · fixed in 6.1.177; From 6.6.115 · fixed in 6.6.144; From 6.12.54 · fixed in 6.12.95; From 6.17.4 · fixed in 6.18

  • Linux Linux

    6.18

  • KernelLinux

    fixed in 5.10.260; From 5.11.0 · fixed in 5.15.211; From 5.16.0 · fixed in 6.1.177; From 6.2.0 · fixed in 6.6.144; From 6.7.0 · fixed in 6.12.95; From 6.13.0 · fixed in 6.18.37; From 6.18.0 · fixed in 7.0.14; From 6.19.0 · fixed in 7.1.2

References 9

git.kernel.org