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Back to active CVEs
High · CVSS 7.8CVE-2025-39990

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

Answer in brief

CVE-2025-39990 records a High severity (CVSS 7.8) vulnerability in bpf: Check the helper function is valid in get_helper_proto. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 15, 2025Updated Oct 21, 2026Source checked Nov 5, 2026First seen by HOL Aug 5, 2026Material review Oct 21, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.8
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=f470378c7562a2818b45ed11c98973f2b89eedd3 <3d429cb1278e995e22995ef117fa96d223a67e93 || >=f470378c7562a2818b45ed11c98973f2b89eedd3 <6233715b4b714068d6c831d214a4e8792109875a || >=f470378c7562a2818b45ed11c98973f2b89eedd3 <e4414b01c1cd9887bbde92f946c1ba94e40d6d643d429cb1278e995e22995ef117fa96d223a67e93, 6233715b4b714068d6c831d214a4e8792109875a, e4414b01c1cd9887bbde92f946c1ba94e40d6d64
Linux/Linuxgeneric5.8Not reported
Linux/Linuxgeneric>=f470378c7562a2818b45ed11c98973f2b89eedd3 <dfbff47f120e4b0793ca0e0b8660361ccac25a74 || >=f470378c7562a2818b45ed11c98973f2b89eedd3 <3d429cb1278e995e22995ef117fa96d223a67e93 || >=f470378c7562a2818b45ed11c98973f2b89eedd3 <6233715b4b714068d6c831d214a4e8792109875a || >=f470378c7562a2818b45ed11c98973f2b89eedd3 <e4414b01c1cd9887bbde92f946c1ba94e40d6d64dfbff47f120e4b0793ca0e0b8660361ccac25a74, 3d429cb1278e995e22995ef117fa96d223a67e93, 6233715b4b714068d6c831d214a4e8792109875a, e4414b01c1cd9887bbde92f946c1ba94e40d6d64

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to 3d429cb1278e995e22995ef117fa96d223a67e93; Linux/Linux to dfbff47f120e4b0793ca0e0b8660361ccac25a74 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 15, 2025

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 21, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 5, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source description

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]

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Nov 5, 2026
References
4 linked sources
Open source record