#VU121505 Improper locking in Linux kernel - CVE-2025-71126
Published: January 14, 2026
Vulnerability identifier: #VU121505
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2025-71126
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
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 repository.
External links
- 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