SB20260919105 - Out-of-bounds write in Linux kernel ntfs
Published: September 19, 2026
Security Bulletin ID
SB20260919105
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds write (CVE-ID: CVE-2026-90118)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to write beyond a destination page.
The vulnerability exists due to an off-by-one error in the per-token range check in ntfs_decompress() when processing a corrupted compressed $DATA attribute during a file read. A remote attacker can supply a corrupted compressed $DATA attribute to write beyond a destination page.
Remediation
Install update from vendor's website.