SB20251001197 - Input validation error in Linux kernel ext4
Published: October 1, 2025 Updated: October 27, 2025
Security Bulletin ID
SB20251001197
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) Input validation error (CVE-ID: CVE-2023-53473)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 6.8 [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]
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper input validation within the dx_show_leaf(), dx_probe(), htree_dirblock_to_tree(), dx_make_map(), ext4_fname_setup_ci_filename() and make_indexed_dir() functions in fs/ext4/namei.c. A local user can perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/4b3cb1d108bfc2aebb0d7c8a52261a53cf7f5786
- https://git.kernel.org/stable/c/70d579aefa652a06af97e013e3fbbabbe5a43553
- https://git.kernel.org/stable/c/b2531936118deb3f479c4fa1bcd787b74b8faa6a
- https://git.kernel.org/stable/c/c1fae027da61fe8e7eb99f7244297e81bc0f1e43
- https://git.kernel.org/stable/c/f68876aeef96ef8b708ab10b9cb47ce0a5adb424
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.29