Incorrect calculation in Linux kernel - CVE-2026-90096
Published: September 19, 2026
Vulnerability identifier: #VU151384
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90096
CWE-ID: CWE-682
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause data inconsistency.
The vulnerability exists due to an incorrect calculation of the post-write cache invalidation range in fuse_direct_write_iter() when performing O_APPEND direct writes. A local user can perform an O_APPEND direct write while a concurrent buffered reader accesses the file to cause data inconsistency.
The issue requires a file whose size is not page-aligned.
Affected software
Linux kernel
How to mitigate CVE-2026-90096
Install security update from vendor's repository.