CVE-2025-38120 Affecting kernel-libbpf package, versions <0:6.12.35-55.103.amzn2023


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.04% (10th percentile)

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  • Snyk IDSNYK-AMZN2023-KERNELLIBBPF-12559590
  • published9 Sept 2025
  • disclosed3 Jul 2025

Introduced: 3 Jul 2025

CVE-2025-38120  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 kernel-libbpf to version 0:6.12.35-55.103.amzn2023 or higher.
This issue was patched in ALAS2023-2025-1080.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-libbpf package and not the kernel-libbpf package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nf_set_pipapo_avx2: fix initial map fill

If the first field doesn't cover the entire start map, then we must zero out the remainder, else we leak those bits into the next match round map.

The early fix was incomplete and did only fix up the generic C implementation.

A followup patch adds a test case to nft_concat_range.sh.

CVSS Base Scores

version 3.1