CVE-2026-53381
High
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.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Linux Kernel
PublishedJul 19, 2026
First seenJul 19, 2026
Weakness typeCWE-416Use after free
How to fix
Update
- linux linux_kernel5.10.260, 5.15.211, 6.1.177, 6.6.144, 6.12.95, 6.18.37, 7.0.14, 7.1.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 5.10.246 ≤ v < 5.10.260, 5.15.196 ≤ v < 5.15.211, 6.1.158 ≤ v < 6.1.177, 6.6.115 ≤ v < 6.6.144, 6.12.54 ≤ v < 6.12.95, 6.17.4 ≤ v < 6.18.37, 6.19 ≤ v < 7.0.14, 7.1 ≤ v < 7.1.2 | 5.10.260, 5.15.211, 6.1.177, 6.6.144, 6.12.95, 6.18.37, 7.0.14, 7.1.2 |
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