SB2026050622 - Improper input validation in Linux kernel ext4
Published: May 6, 2026
Security Bulletin ID
SB2026050622
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper input validation (CVE-ID: CVE-2026-43067)
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper input validation in ext4_mb_scan_groups() when searching for blocks for indirect block mapped files. A local user can create or operate on a crafted ext4 file system layout to cause a denial of service.
The issue can occur on file systems where some files or directories are extent-mapped and others are indirect-block mapped.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/12624c5b724a81e14e532972b40d863b0de3b7d1
- https://git.kernel.org/stable/c/2a368ccddfc492a0aa951e2caef2985f20e96503
- https://git.kernel.org/stable/c/4bec4a498ce86314d470ae6144120461f2138c29
- https://git.kernel.org/stable/c/83170a05908b6cf2fb3235d3065bf613ff866f3c
- https://git.kernel.org/stable/c/bb81702370fad22c06ca12b6e1648754dbc37e0f
- https://git.kernel.org/stable/c/f89bba144938921a2249237ad04a0183ff3f8930