CVE-2025-40135
In the Linux kernel, the following vulnerability has been resolved: ipv6: use RCU in ip6_xmit() Use RCU in ip6_xmit() in order to use dst_dev_rcu() to prevent possible UAF.
Affected versions
Linux kernel versions
4.13
and later are affected. Fixed in
6.1.167,
6.6.130,
6.12.78,
6.17.3,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40135 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/9085e56501d93af9f2d7bd16f7fcfacdde47b99c
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PatchKernel patch commithttps://git.kernel.org/stable/c/bd0905e2122e3680968cd0741966983490bf2ed3
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PatchKernel patch commithttps://git.kernel.org/stable/c/f0a54d00d2f36de40266f47c27989853e8588656
Frequently asked questions
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What is CVE-2025-40135?
CVE-2025-40135 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.13 onward and has been patched in 6.1.167, 6.6.130, 6.12.78 and others. CVE-2025-40135 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-2025-40135?
Yes — CVE-2025-40135 has been patched. Fixed versions include 6.1.167, 6.6.130, 6.12.78 and others. If you are running Linux kernel 4.13 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40135 actively exploited?
No — CVE-2025-40135 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.