CVE-2025-40109
In the Linux kernel, the following vulnerability has been resolved: crypto: rng - Ensure set_ent is always present Ensure that set_ent is always set since only drbg provides it.
Affected versions
Linux kernel versions
5.10
and later are affected. Fixed in
5.10.246,
5.15.195,
6.1.156,
6.6.111,
6.12.52,
6.16.12,
6.17.2,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40109 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/15d6f42da1bb527629d8e1067b1302d58dec9166
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PatchKernel patch commithttps://git.kernel.org/stable/c/17acbcd44fe8dc17dc1072375e76df2d52da6ac8
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PatchKernel patch commithttps://git.kernel.org/stable/c/915cb75983bc5e8b80f8a2f25a4af463f7b18c14
Frequently asked questions
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What is CVE-2025-40109?
CVE-2025-40109 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.10 onward and has been patched in 5.10.246, 5.15.195, 6.1.156 and others. CVE-2025-40109 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-2025-40109?
Yes — CVE-2025-40109 has been patched. Fixed versions include 5.10.246, 5.15.195, 6.1.156 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-2025-40109 actively exploited?
No — CVE-2025-40109 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.