SB20260626178 - Improper Check or Handling of Exceptional Conditions in Linux kernel overlayfs

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check or Handling of Exceptional Conditions (CVE-ID: CVE-2026-53174)

CWE-ID: CWE-703 - Improper Check or Handling of Exceptional Conditions

CVSSv4: 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/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper error handling in ovl_iterate_merged() in fs/overlayfs/readdir.c when processing readdir operations on overlay-on-overlay directories. A local user can trigger nested directory iteration to cause a denial of service.

The issue is reachable through overlay-on-overlay readdir via getdents64.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/1711b6ed6953cee5940ca4c3a6e77f1b3798cee2
• https://git.kernel.org/stable/c/e7051909a01bfb883bfa78b27514854068ac4b85