CVE-2025-71088
kernel: Linux kernel: Denial of Service via MPTCP race condition
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · January 13, 2026
Updated · October 29, 2026
Description
A flaw was found in the Linux kernel's Multipath TCP (MPTCP) subflow. A local attacker with high system privileges could exploit a race condition during simultaneous connection attempts. This issue allows the system's TCP subflow to enter an inconsistent state, bypassing a critical MPTCP security check. The inconsistent state can lead to a system crash, resulting in a Denial of Service (DoS), which means the system becomes unavailable to legitimate users.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 4.1CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
CWE-366 · Race Condition within a Thread