SB2025062087 - Improper locking in Linux kernel ext4
Published: June 20, 2025 Updated: June 21, 2025
Security Bulletin ID
SB2025062087
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 security vulnerability.
1) Improper locking (CVE-ID: CVE-2022-50021)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper locking within the ext4_mb_clear_bb(), EXT4_C2B(), put_bh() and ext4_free_blocks() functions in fs/ext4/mballoc.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/1e1c2b86ef86a8477fd9b9a4f48a6bfe235606f6
- https://git.kernel.org/stable/c/560a2744cbbf03cac65a6394f9b0d99aa437c867
- https://git.kernel.org/stable/c/7550aade978371ac582f6d43b14c4cb89ca54463
- https://git.kernel.org/stable/c/a2522041d248a8c969cbbc97e1fc2cd8b4de120d
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19.4