SB20260928368 - Race condition in Linux kernel mptcp

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-97567)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause inconsistent connection status.

The vulnerability exists due to a race condition in the MPTCP disconnect handling in net/mptcp/protocol.c when disconnecting an MPTCP socket while its retransmission timer is running. A local user can trigger the concurrent disconnect and retransmission timer operations to cause inconsistent connection status.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/374da2b9be1280695ce41f108334a8f16e3e54be
• https://git.kernel.org/stable/c/69a7b2a912672159dda7dcf325d27752d448dfdf
• https://git.kernel.org/stable/c/85c580b0d8590520ae00a15c29e9fb9c99427a3e