CVE-2026-46137
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Race Condition in Linux Kernel MPTCP PM ADD_ADDR Timer

Publication date: 2026-05-28

Last updated on: 2026-05-30

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: ADD_ADDR rtx: fix potential data-race This mptcp_pm_add_timer() helper is executed as a timer callback in softirq context. To avoid any data races, the socket lock needs to be held with bh_lock_sock(). If the socket is in use, retry again soon after, similar to what is done with the keepalive timer.
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Meta Information
Published
2026-05-28
Last Modified
2026-05-30
Generated
2026-06-17
AI Q&A
2026-05-28
EPSS Evaluated
2026-06-16
NVD
CVE-2026-46137
EUVD
EUVD-2026-32764
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 exists in the Linux kernel's multipath TCP (mptcp) implementation, specifically in the pm (path manager) component's ADD_ADDR retransmission logic. The issue arises because the mptcp_pm_add_timer() function, which is executed as a timer callback in a softirq context, does not properly hold the socket lock using bh_lock_sock(). This can lead to potential data races when accessing the socket.

To fix this, the socket lock must be held during the timer callback to prevent concurrent access issues. If the socket is currently in use, the timer should retry soon after, similar to the behavior of the keepalive timer.

Impact Analysis

The vulnerability could lead to data races in the Linux kernel's multipath TCP implementation, which may cause unpredictable behavior such as data corruption, crashes, or other stability issues in systems using this feature.

Such instability could affect network communication reliability and potentially lead to denial of service or other operational disruptions.

Mitigation Strategies

The vulnerability has been resolved by ensuring that the socket lock is held with bh_lock_sock() during the mptcp_pm_add_timer() helper execution to avoid data races.

To mitigate this vulnerability, you should update your Linux kernel to a version that includes this fix.

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