Use-after-free in Linux kernel - CVE-2026-90140
Published: September 19, 2026
Vulnerability identifier: #VU151348
CSH Severity: Low
CVSS v4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90140
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to cause a denial of service.
The vulnerability exists due to a use-after-free in the cuse module's pending RCU callback handling when unloading the cuse module while a fuse connection release callback remains pending. A local privileged user can close /dev/cuse and unload the cuse module before the callback executes to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-90140
Install security update from vendor's repository.
External References
- https://git.kernel.org/stable/c/389bd349ddbcf90dbd8a4f2a4ab6e552d53df134
- https://git.kernel.org/stable/c/45ae914b2f6ea56fc2f1c017fdee4e995bcb4c0e
- https://git.kernel.org/stable/c/4deb3edead0c0e172cc7349e8855d741d3c5e162
- https://git.kernel.org/stable/c/7fe415e1cd8fa875be263670c0ab47109818abb6
- https://git.kernel.org/stable/c/a1b46aee33d83f14ed62d7fdef1a91d3e0b732a9
- https://git.kernel.org/stable/c/ac5c499413385cea3e0220d6050408d50842891d
- https://git.kernel.org/stable/c/c40f3f24839f8404325a2099e26c2a04786ae309