SB20260114162 - Improper locking in Linux kernel mptcp
Published: January 14, 2026
Security Bulletin ID
SB20260114162
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) Improper locking (CVE-ID: CVE-2025-71126)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to improper locking within the __mptcp_retrans() function in net/mptcp/protocol.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/0107442e82c0f8d6010e07e6030741c59c520d6e
- https://git.kernel.org/stable/c/0ca9fb4335e726dab4f23b3bfe87271d8f005f41
- https://git.kernel.org/stable/c/252892d5a6a2f163ce18f32716e46fa4da7d4e79
- https://git.kernel.org/stable/c/50f47c02be419bf0a3ae94c118addf67beef359f
- https://git.kernel.org/stable/c/ffb8c27b0539dd90262d1021488e7817fae57c42