Divide By Zero Affecting kernel-libbpf package, versions <0:6.1.130-139.222.amzn2023


Severity

Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.04% (11th percentile)

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  • Snyk IDSNYK-AMZN2023-KERNELLIBBPF-11445335
  • published5 Aug 2025
  • disclosed1 Apr 2025

Introduced: 1 Apr 2025

CVE-2025-21898  (opens in a new tab)
CWE-369  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 kernel-libbpf to version 0:6.1.130-139.222.amzn2023 or higher.
This issue was patched in ALAS2023-2025-901.

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:

ftrace: Avoid potential division by zero in function_stat_show()

Check whether denominator expression x * (x - 1) * 1000 mod {2^32, 2^64} produce zero and skip stddev computation in that case.

For now don't care about rec->counter * rec->counter overflow because rec->time * rec->time overflow will likely happen earlier.

CVSS Base Scores

version 3.1