Use-after-free in Linux kernel - CVE-2026-53388
Published: July 21, 2026
Vulnerability identifier: #VU138882
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-53388
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in fuse_try_move_folio() in the FUSE subsystem when moving a page cache folio during FUSE read handling. A local user can trigger a race condition to cause a denial of service.
The issue occurs because the request is not re-locked on the success path, allowing request abortion to free fuse_io_args while subsequent copy logic still accesses it.
Affected software
Linux kernel
How to mitigate CVE-2026-53388
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/0223f452532d9cd8a5e87c45de828fd93c99bd25
- https://git.kernel.org/stable/c/030fe3e9d8abdee303dd7e9e42f45082d382a407
- https://git.kernel.org/stable/c/46473ddccdc5065033e397d6e62c280dbcd3d9c2
- https://git.kernel.org/stable/c/5927b43a4f8d89e86930f524bf63e9c7e66f61b4
- https://git.kernel.org/stable/c/7c18691e0cfda29672f79bafde8abdb7710674f6
- https://git.kernel.org/stable/c/a078484921052d0badd827fcc2770b5cfc1d4120
- https://git.kernel.org/stable/c/af2892249d982a1c036ca456cc135374e68b6677
- https://git.kernel.org/stable/c/e28db6ac4792d065ab32565fd9f0a2361c3d4666