SB2025100877 - NULL pointer dereference in Linux kernel md bcache driver
Published: October 8, 2025 Updated: October 26, 2025
Security Bulletin ID
SB2025100877
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) NULL pointer dereference (CVE-ID: CVE-2023-53681)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to NULL pointer dereference within the __bch_btree_node_alloc() function in drivers/md/bcache/btree.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/4514847aee18d9391a0cf3aad75d3567c72795a4
- https://git.kernel.org/stable/c/587b4e8bb5dac682f09280ab35db4632b29d5ac4
- https://git.kernel.org/stable/c/7ecea5ce3dc17339c280c75b58ac93d8c8620d9f
- https://git.kernel.org/stable/c/80fca8a10b604afad6c14213fdfd816c4eda3ee4
- https://git.kernel.org/stable/c/a4405f6ee03323410d7b10966fd67b35f71b1944
- https://git.kernel.org/stable/c/b070f29a61436f6f8a2e3abc7ea4f4be81695198
- https://git.kernel.org/stable/c/f67b0e3081f2a24170280a33ac66f6b112083c03
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.121