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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.14%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.14% probability · 4th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/06b41351779e9289e8785694ade9042ae85e41eaPatch
- https://git.kernel.org/stable/c/0b809199ff87c44487e516a725dd4be2185712cePatch
- https://git.kernel.org/stable/c/1cc0e3a0c6499aaaa2f21a4fcbba388486afb25ePatch
- https://git.kernel.org/stable/c/2181a09ba980f142650fb053666350ead4471cfePatch
- https://git.kernel.org/stable/c/2abfd3ffbd9452f72535d96ff3982b3ab1f8f2f9Patch
- https://git.kernel.org/stable/c/39a2b95e008665c14f84e50ed411d898df7cd11bPatch
- https://git.kernel.org/stable/c/607a1d4c42f649e6197567c0448fd9ebb316cd42Patch
- https://git.kernel.org/stable/c/97c4691653d145dcc699eca5d3aba3219a520f1fPatch
- https://git.kernel.org/stable/c/e09412a714bcd49375198427bb4aa005037a9d6fPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.