CVE-2026-23169
Unknown Unknown - Not Provided
Race Condition in Linux Kernel MPTCP Causes Crash

Publication date: 2026-02-14

Last updated on: 2026-04-03

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: mptcp: fix race in mptcp_pm_nl_flush_addrs_doit() syzbot and Eulgyu Kim reported crashes in mptcp_pm_nl_get_local_id() and/or mptcp_pm_nl_is_backup() Root cause is list_splice_init() in mptcp_pm_nl_flush_addrs_doit() which is not RCU ready. list_splice_init_rcu() can not be called here while holding pernet->lock spinlock. Many thanks to Eulgyu Kim for providing a repro and testing our patches.
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Meta Information
Published
2026-02-14
Last Modified
2026-04-03
Generated
2026-06-16
AI Q&A
2026-02-14
EPSS Evaluated
2026-06-15
NVD
CVE-2026-23169
Affected Vendors & Products
Showing 12 associated CPEs
Vendor Product Version / Range
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel From 5.16 (inc) to 6.1.164 (exc)
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel From 6.13 (inc) to 6.18.9 (exc)
linux linux_kernel From 5.11 (inc) to 5.15.201 (exc)
linux linux_kernel From 6.2 (inc) to 6.6.125 (exc)
linux linux_kernel From 6.7 (inc) to 6.12.72 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-362 The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
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Executive Summary

This vulnerability exists in the Linux kernel's Multipath TCP (mptcp) implementation. It involves a race condition in the function mptcp_pm_nl_flush_addrs_doit(). The root cause is that the function list_splice_init() used in this context is not safe for Read-Copy-Update (RCU) operations, and calling list_splice_init_rcu() is also not possible here because it would require holding a pernet->lock spinlock, which is not allowed. This race condition can lead to crashes in related functions such as mptcp_pm_nl_get_local_id() and mptcp_pm_nl_is_backup().

Impact Analysis

The vulnerability can cause crashes in the Linux kernel's Multipath TCP subsystem. Such crashes may lead to system instability or denial of service conditions, potentially disrupting network connectivity or affecting applications relying on Multipath TCP.

Compliance Impact

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