Incorrect calculation in Linux kernel - CVE-2026-89768
Published: September 12, 2026
Vulnerability identifier: #VU149023
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-2026-89768
CWE-ID: CWE-682
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-89768
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3