Low [CVE-2026-89768] Linux kernel: Information disclosure via incorrect path derivation in nested overlayfs
This low-severity Red Hat Linux advisory covers CVE-2026-89768.
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Summary
A flaw was found in the Linux kernel's filesystem (fs) component. When using nested overlay filesystems (overlayfs), a local user could exploit an issue where the backing_file_open() function incorrectly derives the path for mapped files.
This vulnerability leads to information disclosure, as files mapped through a nested overlayfs display an incorrect path in /proc//maps and perf/ftrace mmap records. Red Hat severity: Low — CVSS 2.3 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N).
Weakness: CWE-41.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 55 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 55 minutes ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 55 minutes ago·verify at source
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