SB20260720147 - Out-of-bounds write in Linux kernel fs
Published: July 20, 2026
Security Bulletin ID
SB20260720147
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds write (CVE-ID: CVE-2026-64074)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 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]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds write in statmount_mnt_idmap when handling mount ID mapping data in a seq_file buffer. A local user can trigger an integer count state that bypasses overflow detection to cause a denial of service.
The issue results in a 1-byte NULL out-of-bounds write on a dynamically allocated seq buffer.
Remediation
Install update from vendor's website.