SB2026091205 - Incorrect calculation in Linux kernel fs
Published: September 12, 2026
Security Bulletin ID
SB2026091205
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-2026-89768)
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 incorrect file path information to be reported.
The vulnerability exists due to incorrect path handling in backing_file_open() when mapping files through nested overlayfs mounts. A local user can map a file through nested overlayfs mounts to cause incorrect file path information to be reported.
Incorrect paths may be shown in procfs memory-map entries and perf or ftrace mmap records.
Remediation
Install update from vendor's website.