SB2025120453 - Use-after-free in Linux kernel mptcp
Published: December 4, 2025
Security Bulletin ID
SB2025120453
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-2025-40257)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the mptcp_remove_anno_list_by_saddr(), mptcp_pm_del_add_timer() and mptcp_pm_free_anno_list() functions in net/mptcp/pm.c. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.