SB20260425119 - Improper input validation in Linux kernel ocfs2

Description

This security bulletin contains information about 1 vulnerability.

1) Improper input validation (CVE-ID: CVE-2026-31596)

CWE-ID: CWE-20 - Improper input validation

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 input validation in ocfs2_group_extend when handling a crafted filesystem through the resize ioctl. A local user can trigger the resize operation on a crafted filesystem image to cause a denial of service.

The issue occurs because an invalid global bitmap inode can reach the JBD2-managed buffer path and lead to a kernel BUG instead of a clean failure.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/10fb72c47aac446f12a4ccd962c7daa60cc890a1
• https://git.kernel.org/stable/c/41c6e9bc3a09539deab43957a3211d902a4818f0
• https://git.kernel.org/stable/c/911b557dd7817460881fd51a03069b539c674d0e
• https://git.kernel.org/stable/c/e384a850a3370d89a7a446cdeccd964bfba2a302