7.8

CVE-2026-53381

virtiofs: fix UAF on submount umount

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 5.10.246 < 5.10.260
Linux ≫ Linux Kernel Version >= 5.15.196 < 5.15.211
Linux ≫ Linux Kernel Version >= 6.1.158 < 6.1.177
Linux ≫ Linux Kernel Version >= 6.6.115 < 6.6.144
Linux ≫ Linux Kernel Version >= 6.12.54 < 6.12.95
Linux ≫ Linux Kernel Version >= 6.17.4 < 6.18.37
Linux ≫ Linux Kernel Version >= 6.19 < 7.0.14
Linux ≫ Linux Kernel Version >= 7.1 < 7.1.2
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.14% 0.037
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
416baaa9-dc9f-4396-8d5f-8c081fb06d67 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

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