SB2025121077 - Use-after-free in Linux kernel smb client
Published: December 10, 2025 Updated: December 12, 2025
Security Bulletin ID
SB2025121077
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-2023-53794)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the smb2_reconnect_server() function in fs/smb/client/smb2pdu.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/759ffc164d95a32c09528766d74d9b4fb054e8f4
- https://git.kernel.org/stable/c/7e4f5c3f01fb0e51ca438e43262d858daf9a0a76
- https://git.kernel.org/stable/c/99f280700b4cc02d5f141b8d15f8e9fad0418f65
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.47
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.4.12
- https://mirrors.edge.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.5