CVE-2025-40203
In the Linux kernel, the following vulnerability has been resolved: listmount: don't call path_put() under namespace semaphore Massage listmount() and make sure we don't call path_put() under the namespace semaphore. If we put the last reference we're fscked.
Affected versions
Linux kernel versions
6.8
and later are affected. Fixed in
6.12.54,
6.17.4,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40203 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/659874b7ee4976ad9ce476e07fd36bc67b3537f1
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PatchKernel patch commithttps://git.kernel.org/stable/c/9c80da26fda2fdcaac7f92b5908875b3108830ff
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PatchKernel patch commithttps://git.kernel.org/stable/c/c1f86d0ac322c7e77f6f8dbd216c65d39358ffc0
Frequently asked questions
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What is CVE-2025-40203?
CVE-2025-40203 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.8 onward and has been patched in 6.12.54, 6.17.4 and 6.18. CVE-2025-40203 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-2025-40203?
Yes — CVE-2025-40203 has been patched. Fixed versions include 6.12.54, 6.17.4 and 6.18. If you are running Linux kernel 6.8 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40203 actively exploited?
No — CVE-2025-40203 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.