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

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00032.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
f470378c7562a2818b45ed11c98973f2b89eedd3 affected < 3d429cb1278e995e22995ef117fa96d223a67e93
f470378c7562a2818b45ed11c98973f2b89eedd3 affected < 6233715b4b714068d6c831d214a4e8792109875a
f470378c7562a2818b45ed11c98973f2b89eedd3 affected < e4414b01c1cd9887bbde92f946c1ba94e40d6d64
Linux Linux affected
Version Status Constraints
5.8 affected —
0 unaffected < 5.8
6.12.50 unaffected ≤ 6.12.*
6.16.10 unaffected ≤ 6.16.*
6.17 unaffected ≤ *

No data.

No data.

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/3d429cb1278e995e22995ef117fa96d223a67e93 cve-icon cve-icon
https://git.kernel.org/stable/c/6233715b4b714068d6c831d214a4e8792109875a cve-icon cve-icon
https://git.kernel.org/stable/c/e4414b01c1cd9887bbde92f946c1ba94e40d6d64 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025101502-CVE-2025-39990-25bc@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-39990 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-39990 cve-icon
History

Fri, 02 Jan 2026 15:45:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Mon, 20 Oct 2025 13:30:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Vendors & Products Linux
Linux linux Kernel

Thu, 16 Oct 2025 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Low

Wed, 15 Oct 2025 08:00:00 +0000

Type Values Removed Values Added
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/202507160818.68358831-lkp@intel.com
Title bpf: Check the helper function is valid in get_helper_proto
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-01-02T15:32:47.228Z

Reserved: 2025-04-16T07:20:57.150Z

Link: CVE-2025-39990

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-10-15T08:15:37.060

Modified: 2025-10-16T15:28:59.610

Link: CVE-2025-39990

cve-icon Redhat

Severity : Low

Publid Date: 2025-10-15T00:00:00Z

Links: CVE-2025-39990 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2025-10-20T13:27:01Z

Weaknesses

No weakness.