CVE-2025-40047
In the Linux kernel, the following vulnerability has been resolved: io_uring/waitid: always prune wait queue entry in io_waitid_wait() For a successful return, always remove our entry from the wait queue entry list. Previously this was skipped if a cancelation was in progress, but this can race with another invocation of the wait queue entry callback.
Affected versions
Linux kernel versions
6.7
and later are affected. Fixed in
6.12.53,
6.17.3,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40047 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/2f8229d53d984c6a05b71ac9e9583d4354e3b91f
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PatchKernel patch commithttps://git.kernel.org/stable/c/3e2205db2f0608898d535da1964e1b376aacfdaa
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PatchKernel patch commithttps://git.kernel.org/stable/c/696ba6032081e617564a8113a001b8d7943cb928
Frequently asked questions
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What is CVE-2025-40047?
CVE-2025-40047 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.7 onward and has been patched in 6.12.53, 6.17.3 and 6.18. CVE-2025-40047 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-2025-40047?
Yes — CVE-2025-40047 has been patched. Fixed versions include 6.12.53, 6.17.3 and 6.18. If you are running Linux kernel 6.7 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40047 actively exploited?
No — CVE-2025-40047 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.