SB20251230150 - Use-after-free in Linux kernel md bcache driver
Published: December 30, 2025 Updated: December 31, 2025
Security Bulletin ID
SB20251230150
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-2023-54293)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the bch_root_node_dirty_init() function in drivers/md/bcache/writeback.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/25ec4779d0fb3ed9cac1e4d9e0e4261b4a12f6ed
- https://git.kernel.org/stable/c/2882a4c4f0c90e99f37dbd8db369b9982fd613e7
- https://git.kernel.org/stable/c/bcb295778afda4f2feb0d3c0289a53fd43d5a3a6
- https://git.kernel.org/stable/c/cbdd5b3322f7bbe6454c97cac994757f1192c07b
- https://git.kernel.org/stable/c/f0854489fc07d2456f7cc71a63f4faf9c716ffbe
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.188
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.121
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.39
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.4.4
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.5