CVE-2025-40158
In the Linux kernel, the following vulnerability has been resolved: ipv6: use RCU in ip6_output() Use RCU in ip6_output() in order to use dst_dev_rcu() to prevent possible UAF. We can remove rcu_read_lock()/rcu_read_unlock() pairs from ip6_finish_output2().
Affected versions
Linux kernel versions
4.13
and later are affected. Fixed in
6.17.3,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40158 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/0393f85c3241c19ba8550f04a812e7d19f6b3082
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PatchKernel patch commithttps://git.kernel.org/stable/c/11709573cc4e48dc34c80fc7ab9ce5b159e29695
Frequently asked questions
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What is CVE-2025-40158?
CVE-2025-40158 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.13 onward and has been patched in 6.17.3 and 6.18. CVE-2025-40158 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-2025-40158?
Yes — CVE-2025-40158 has been patched. Fixed versions include 6.17.3 and 6.18. 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-2025-40158 actively exploited?
No — CVE-2025-40158 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.