CVE-2026-23169
Race Condition in Linux Kernel MPTCP Causes Crash
Publication date: 2026-02-14
Last updated on: 2026-04-03
Assigner: kernel.org
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| 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 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. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
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().
How can this vulnerability impact me? :
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.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
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How can this vulnerability be detected on my network or system? Can you suggest some commands?
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What immediate steps should I take to mitigate this vulnerability?
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