CVE-2025-39990
In the Linux kernel, the following vulnerability has been resolved: bpf: Check the helper function is valid in get_helper_proto kernel test robot reported verifier bug [1] where the helper func pointer could be NULL due to disabled config option. As Alexei suggested we could check on that in get_helper_proto directly. Marking tail_call helper func with BPF_PTR_POISON, because it is unused by design. [1] https://lore.kernel.org/oe-lkp/[email protected]
Affected versions
Linux kernel versions
5.8
and later are affected. Fixed in
6.12.50,
6.16.10,
6.17
and their respective stable series.
References
The following references provide additional information about CVE-2025-39990 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/3d429cb1278e995e22995ef117fa96d223a67e93
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PatchKernel patch commithttps://git.kernel.org/stable/c/6233715b4b714068d6c831d214a4e8792109875a
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PatchKernel patch commithttps://git.kernel.org/stable/c/e4414b01c1cd9887bbde92f946c1ba94e40d6d64
Frequently asked questions
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What is CVE-2025-39990?
CVE-2025-39990 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.8 onward and has been patched in 6.12.50, 6.16.10 and 6.17. CVE-2025-39990 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-2025-39990?
Yes — CVE-2025-39990 has been patched. Fixed versions include 6.12.50, 6.16.10 and 6.17. If you are running Linux kernel 5.8 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-39990 actively exploited?
No — CVE-2025-39990 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.