CVE-2026-46158
In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: ADD_ADDR rtx: always decrease sk refcount When an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer(). It should then be released in all cases at the end. Some (unlikely) checks were returning directly instead of calling sock_put() to decrease the refcount. Jump to a new 'exit' label to call __sock_put() (which will become sock_put() in the next commit) to fix this potential leak. While at it, drop the '!msk' check which cannot happen because it is never reset, and explicitly mark the remaining one as "unlikely".
Affected versions
Linux kernel versions
5.10
and later are affected. Fixed in
6.6.142,
6.12.92,
6.18.30,
7.0.7,
7.1-rc3
and their respective stable series.
References
The following references provide additional information about CVE-2026-46158 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/25e37407442b8766ec2cf52fb4e31b5c3d3aeeae
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PatchKernel patch commithttps://git.kernel.org/stable/c/9426265e157dd77ec237c795901ed4dea6d69b5c
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PatchKernel patch commithttps://git.kernel.org/stable/c/9634cb35af17019baec21ca648516ce376fa10e6
Frequently asked questions
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What is CVE-2026-46158?
CVE-2026-46158 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.10 onward and has been patched in 6.6.142, 6.12.92, 6.18.30 and others. CVE-2026-46158 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-46158?
Yes — CVE-2026-46158 has been patched. Fixed versions include 6.6.142, 6.12.92, 6.18.30 and others. If you are running Linux kernel 5.10 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-46158 actively exploited?
No — CVE-2026-46158 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.