Improper input validation in Linux kernel - CVE-2026-31596
Published: April 25, 2026
Vulnerability identifier: #VU127801
CSH Severity: Low
CVSS v4.0: 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
CVE-ID: CVE-2026-31596
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-31596
Install security update from vendor's repository.