CVE-2026-97523
Received Received - Intake

Race Condition in Linux Kernel MPTCP Scheduler

Publication date: 2026-09-25

Last updated on: 2026-09-25

Assigner: kernel.org

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.

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Meta Information

Published
2026-09-25
Last Modified
2026-09-25
Generated
2026-09-25
AI Q&A
2026-09-25
EPSS Evaluated
N/A
NVD
CVE-2026-97523
EUVD
EUVD-2026-86831

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves a race condition between the MPTCP scheduler and subflow socket state changes. It can cause data transmission to fail on the selected socket, and later socket release might attempt a divide operation using a reset MSS value of 0.

Impact Analysis

This could lead to network communication failures or crashes in systems using Multipath TCP (MPTCP). Users might experience interrupted connections or system instability during data transmission.

Mitigation Strategies

Update the Linux kernel to the latest patched version to resolve the mptcp scheduler race condition. Monitor kernel logs for mptcp-related errors indicating scheduler or state change conflicts.

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