CVE-2026-97523: mptcp: close race between scheduler and state change
In the Linux kernel, the following vulnerability has been resolved:
mptcp: close race between scheduler and state change
The mptcp scheduler may race with subflow sockets state change: data transmission on the selected socket may fail and a later release could try to use mssnow reset to 0 for a divide operation.
Address the issue by explicitly checking for the critical scenario.
Affected Software
Event History
Frequently Asked Questions
What condition triggers the failure?
The issue occurs when the MPTCP scheduler races with a subflow socket state change. Data transmission on the selected socket can fail, and a later release may use an mss_now value reset to 0 in a division operation.
What remediation is available?
The issue has been resolved by explicitly checking for the critical race scenario. The provided stable kernel references identify commits containing the fix.