CVE-2025-40117
In the Linux kernel, the following vulnerability has been resolved: misc: pci_endpoint_test: Fix array underflow in pci_endpoint_test_ioctl() Commit eefb83790a0d ("misc: pci_endpoint_test: Add doorbell test case") added NO_BAR (-1) to the pci_barno enum which, in practical terms, changes the enum from an unsigned int to a signed int. If the user passes a negative number in pci_endpoint_test_ioctl() then it results in an array underflow in pci_endpoint_test_bar().
Affected versions
Linux kernel versions
6.17
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-2025-40117 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/1ad82f9db13d85667366044acdfb02009d576c5a
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PatchKernel patch commithttps://git.kernel.org/stable/c/6df3687922570f753574c40b35e83b26b32292d0
Frequently asked questions
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What is CVE-2025-40117?
CVE-2025-40117 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.17 onward and has been patched in 6.17.3 and 6.18. CVE-2025-40117 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-2025-40117?
Yes — CVE-2025-40117 has been patched. Fixed versions include 6.17.3 and 6.18. If you are running Linux kernel 6.17 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40117 actively exploited?
No — CVE-2025-40117 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.