What’s Vulnerable › Vulnerabilities

CVE-2026-23169: mptcp: fix race in mptcp_pm_nl_flush_addrs_doit()

• Severity: medium (CVSS 4.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-14 · updated 2026-06-17
• Weakness: CWE-362

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.

Affected products

• Linux kernel: from 5.11 before 5.15.201; from 5.16 before 6.1.164; from 6.2 before 6.6.125; from 6.7 before 6.12.72; from 6.13 before 6.18.9; 6.19-rc1, 6.19-rc2, 6.19-rc3, 6.19-rc4, 6.19-rc5, 6.19-rc6 (+1) — fixed in 5.15.201, 6.1.164, 6.12.72, 6.18.9, 6.6.125

How to fix

Upgrade to a fixed version: Linux kernel 5.15.201, 6.1.164, 6.12.72, 6.18.9. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1f1b9523527df02685dde603f20ff6e603d8e4a1
• https://git.kernel.org/stable/c/338d40bab283da2639780ee3e458fb61f1567d8c
• https://git.kernel.org/stable/c/455e882192c9833f176f3fbbbb2f036b6c5bf555
• https://git.kernel.org/stable/c/51223bdd0f60b06cfc7f25885c4d4be917adba94
• https://git.kernel.org/stable/c/7896dbe990d56d5bb8097863b2645355633665eb
• https://git.kernel.org/stable/c/e2a9eeb69f7d4ca4cf4c70463af77664fdb6ab1d

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