What is CVE-2026-97523?

CVE-2026-97523 is a high-severity vulnerability in Linux. CVSS score: 7.5/10. Published 2026-09-25.

How severe is CVE-2026-97523?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Linux

CVE-2026-97523

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 mss_now reset to 0 for a divide operation. Address the issue by explicitly checking for the critical scenario.

Published 2026-09-25 · last modified 2026-09-25.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Linux — versions 6.0, 8caf5c15b5288d52d9c89374d6c10fa32ee84ec5, fb9c73ef2ac2ec816efdc8b9267bc04e1369c20b

References

Frequently asked questions

What is CVE-2026-97523?: CVE-2026-97523 is a high-severity vulnerability in Linux. CVSS score: 7.5/10. Published 2026-09-25.
How severe is CVE-2026-97523?: High severity. CVSS v3 base score is 7.5 out of 10.