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CVE-2026-97523

Linux: mptcp: close race between scheduler and state change

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
7.5High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.67%Chance of exploitation activity in the next 30 days, higher than 51% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in5883ae880f51edc4b1484e787473b865b6159eadAlso 0a926b5df8efdfbac07e2fb7fafb21849a2ad9c0, 8f11430d51ff8365bc51b670bc3002b65ae4c6b7 and 4 moreCVE List
Published25 Sep 2026Updated 19 Oct 2026CVE List

What fixes it

  • 5883ae880f51edc4b1484e787473b865b6159eadLinuxCVE List
  • 0a926b5df8efdfbac07e2fb7fafb21849a2ad9c0LinuxCVE List
  • 8f11430d51ff8365bc51b670bc3002b65ae4c6b7LinuxCVE List
  • 4c856f3c151a2f3fa237caa651c44015916ca584LinuxCVE List
  • 42064de57fb83231fcc89663a94885f228a1ee53LinuxCVE List
  • 5.15.222LinuxCVE List
Show all 7 fixed versions

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

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.

Text from CVE List

Affected versions 19

  • Linuxaffected: fb9c73ef2ac2ec816efdc8b9267bc04e1369c20b before d74b2e26b54a7dae1d87c1f19ae0d6db500e5e03CVE List
  • Linuxaffected: c886d70286bf3ad411eb3d689328a67f7102c6ae before 5883ae880f51edc4b1484e787473b865b6159eadCVE List
  • Linuxaffected: c886d70286bf3ad411eb3d689328a67f7102c6ae before 0a926b5df8efdfbac07e2fb7fafb21849a2ad9c0CVE List
  • Linuxaffected: c886d70286bf3ad411eb3d689328a67f7102c6ae before 8f11430d51ff8365bc51b670bc3002b65ae4c6b7CVE List
  • Linuxaffected: c886d70286bf3ad411eb3d689328a67f7102c6ae before a09c87abf10a0a7e203137c75b5381aa63d9b31dCVE List
  • Linuxaffected: c886d70286bf3ad411eb3d689328a67f7102c6ae before 4c856f3c151a2f3fa237caa651c44015916ca584CVE List
  • Linuxaffected: c886d70286bf3ad411eb3d689328a67f7102c6ae before 42064de57fb83231fcc89663a94885f228a1ee53CVE List
  • Linuxaffected: 8caf5c15b5288d52d9c89374d6c10fa32ee84ec5CVE List
  • Linuxaffected: 5.15.190 before 5.15.222CVE List
  • Linuxaffected: 5.19.4 before 5.20CVE List
  • Linuxaffected: 6.0CVE List
  • Linuxunaffected: all versions before 6.0CVE List
  • Linuxunaffected: 5.15.222 through 5.15.*CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.111 through 6.12.*CVE List
  • Linuxunaffected: 6.18.53 through 6.18.*CVE List
  • Linuxunaffected: 7.2.7 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 7