CVE-2025-37939: libbpf: Fix accessing BTF.ext core_relo header

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-20 · updated 2026-06-17
Weakness: CWE-120

Description

In the Linux kernel, the following vulnerability has been resolved: libbpf: Fix accessing BTF.ext core_relo header Update btf_ext_parse_info() to ensure the core_relo header is present before reading its fields. This avoids a potential buffer read overflow reported by the OSS Fuzz project.

Affected products

Linux kernel: from 6.13 before 6.13.11; from 6.14 before 6.14.2 — fixed in 6.13.11, 6.14.2

How to fix

Upgrade to a fixed version: Linux kernel 6.13.11, 6.14.2. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/0a7c2a84359612e54328aa52030eb202093da6e2
https://git.kernel.org/stable/c/3a67f60f0a8be10cea7a884a1a00e9feb6645657
https://git.kernel.org/stable/c/d529411ec44535308c5d59cbeff74be6fe14b479

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