SB20260919116 - Incorrect calculation in Linux kernel fuse
Published: September 19, 2026
Security Bulletin ID
SB20260919116
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Incorrect calculation (CVE-ID: CVE-2026-90096)
CWE-ID: CWE-682 - Incorrect Calculation
CVSSv4: 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]
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.
Remediation
Install update from vendor's website.