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CVE-2026-97523

mptcp: close race between scheduler and state change

HIGH
7.5
CVSS Score
Published: September 25, 2026 at 10:21 AM UTC
Updated: October 19, 2026 at 10:17 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH7.5
Exploit prediction
EPSS 0.7%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
90%
5.15.1905.19.46.08caf5c15b5288d52d9c89374d6c10fa32ee84ec5c886d70286bf3ad411eb3d689328a67f7102c6aefb9c73ef2ac2ec816efdc8b9267bc04e1369c20b
Vendor states this is fixed in 0a926b5df8efdfbac07e2fb7fafb21849a2ad9c0 (fixed)
Vendor states this is fixed in 42064de57fb83231fcc89663a94885f228a1ee53 (fixed)
Vendor states this is fixed in 4c856f3c151a2f3fa237caa651c44015916ca584 (fixed)
Vendor states this is fixed in 5883ae880f51edc4b1484e787473b865b6159ead (fixed)
Vendor states this is fixed in 8f11430d51ff8365bc51b670bc3002b65ae4c6b7 (fixed)
Vendor states this is fixed in a09c87abf10a0a7e203137c75b5381aa63d9b31d (fixed)
Vendor states this is fixed in d74b2e26b54a7dae1d87c1f19ae0d6db500e5e03 (fixed)
Vendor states this is fixed in 5.15.222 (unaffected)
Affected range stops below 5.20, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 6.0 (unaffected)
Vendor states this is fixed in 6.1.189 (unaffected)
Vendor states this is fixed in 6.12.111 (unaffected)
Vendor states this is fixed in 6.18.53 (unaffected)
Vendor states this is fixed in 6.6.158 (unaffected)
Vendor states this is fixed in 7.2.7 (unaffected)
Vendor states this is fixed in 7.3 (unaffected)
Vendor states this is fixed in 7.3-rc4 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (7)

Source: cverecord
https://git.kernel.org/stable/c/8f11430d51ff8365bc51b670bc3002b65ae4c6b7
Source: cverecord
https://git.kernel.org/stable/c/a09c87abf10a0a7e203137c75b5381aa63d9b31d
Source: cverecord
https://git.kernel.org/stable/c/4c856f3c151a2f3fa237caa651c44015916ca584
Source: cverecord
https://git.kernel.org/stable/c/42064de57fb83231fcc89663a94885f228a1ee53
Source: cverecord
https://git.kernel.org/stable/c/d74b2e26b54a7dae1d87c1f19ae0d6db500e5e03
Source: cverecord
https://git.kernel.org/stable/c/5883ae880f51edc4b1484e787473b865b6159ead
Source: cverecord
https://git.kernel.org/stable/c/0a926b5df8efdfbac07e2fb7fafb21849a2ad9c0

CVSS

7.5HIGHLinux
Vector?

Quick Info

StatusRECEIVED

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