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CVE-2026-64354

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: bpf: Validate BTF repeated field counts before expansion btf_parse_struct_metas() walks user-supplied BTF during BPF_BTF_LOAD,…

Published Jul 25, 2026EPSS 0.13%

Overview

CVE-2026-64354 is a high-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

bpf: Validate BTF repeated field counts before expansion

btf_parse_struct_metas() walks user-supplied BTF during BPF_BTF_LOAD,

and btf_repeat_fields() expands repeatable fields from array elements

into the fixed BTF_FIELDS_MAX scratch array used by btf_parse_fields().

The remaining-capacity check performs the expanded field count calculation

in u32. A malformed BTF can wrap that calculation, causing the check to

pass even when the expanded field count exceeds the scratch array

capacity. The following memcpy() can then write past the end of the

array.

Use checked addition and multiplication before copying repeated fields

and reject impossible counts.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/b9452b594fd3aecbfd4aa0a6a1f741330a37dab7Refgit.kernel.org/stable/c/c5ff816d5f13900c3f1f3298cfcc61339e056e56Refgit.kernel.org/stable/c/cd407de2ef5dc70f1970b343ffaa16186340fdfdRefgit.kernel.org/stable/c/ff77d013b737c0f77d925e2f2c59f0cf3d76bd35

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64354?

CVE-2026-64354 is a high-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-64354?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-64354?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-64354?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64354 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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