SB20250226316 - Use-after-free in Linux kernel block
Published: February 26, 2025 Updated: May 11, 2025
Security Bulletin ID
SB20250226316
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Use-after-free (CVE-ID: CVE-2021-47646)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the bfq_setup_merge() and bfq_setup_cooperator() functions in block/bfq-iosched.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/15729ff8143f8135b03988a100a19e66d7cb7ecd
- https://git.kernel.org/stable/c/4083925bd6dc89216d156474a8076feec904e607
- https://git.kernel.org/stable/c/65d8a737452e88f251fe5d925371de6d606df613
- https://git.kernel.org/stable/c/931aff627469a75c77b9fd3823146d0575afffd6
- https://git.kernel.org/stable/c/abc2129e646af7b43025d90a071f83043f1ae76c
- https://git.kernel.org/stable/c/cc051f497eac9d8a0d816cd4bffa3415f2724871
- https://git.kernel.org/stable/c/f990f0985eda59d4f29fc83fcf300c92b1225d39
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.238