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CVE-2025-39990

bpf: Check the helper function is valid in get_helper_proto

HIGH
7.8
CVSS Score
Published: October 15, 2025 at 07:56 AM UTC
Updated: October 21, 2026 at 01:18 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH7.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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]

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
90%
5.8f470378c7562a2818b45ed11c98973f2b89eedd3
Vendor states this is fixed in 3d429cb1278e995e22995ef117fa96d223a67e93 (fixed)
Vendor states this is fixed in 6233715b4b714068d6c831d214a4e8792109875a (fixed)
Vendor states this is fixed in e4414b01c1cd9887bbde92f946c1ba94e40d6d64 (fixed)
Vendor states this is fixed in 5.8 (unaffected)
Vendor states this is fixed in 6.12.50 (unaffected)
Vendor states this is fixed in 6.16.10 (unaffected)
Vendor states this is fixed in 6.17 (unaffected)
Vendor states this is fixed in 6.6.160 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHLinux
Vector?

Quick Info

StatusDEFERRED

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