High 7.8Published Oct 15, 2025

CVE-2025-39990bpf: Check the helper function is valid in get_helper_proto

Updated under an hour ago (Oct 28, 2026, 6:20 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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/202507160818.68358831-lkp@intel.com

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Deferred
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from f470378c7562a2818b45ed11c98973f2b89eedd3 before dfbff47f120e4b0793ca0e0b8660361ccac25a74; from f470378c7562a2818b45ed11c98973f2b89eedd3 before 3d429cb1278e995e22995ef117fa96d223a67e93; from f470378c7562a2818b45ed11c98973f2b89eedd3 before 6233715b4b714068d6c831d214a4e8792109875a; from f470378c7562a2818b45ed11c98973f2b89eedd3 before e4414b01c1cd9887bbde92f946c1ba94e40d6d64	CNA record

References

References

https://git.kernel.org/stable/c/dfbff47f120e4b0793ca0e0b8660361ccac25a74
https://git.kernel.org/stable/c/3d429cb1278e995e22995ef117fa96d223a67e93
https://git.kernel.org/stable/c/6233715b4b714068d6c831d214a4e8792109875a
https://git.kernel.org/stable/c/e4414b01c1cd9887bbde92f946c1ba94e40d6d64

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.