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CVE-2026-64413

7.0 · HIGH

In the Linux kernel, the following vulnerability has been resolved: netfilter: ebtables: zero chainstack array sashiko reports: looking at ebtables table translation, could a sparse cpu_possibl…

Published Jul 25, 2026EPSS 0.13%

Overview

CVE-2026-64413 is a high-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 7.0 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.0, 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:

netfilter: ebtables: zero chainstack array

sashiko reports:

looking at ebtables table

translation, could a sparse cpu_possible_mask lead to an uninitialized pointer

free?

If cpu_possible_mask is sparse (for example, CPU 0 and CPU 2 are possible,

but CPU 1 is not), the allocation loop skips CPU 1. If vmalloc_node() fails at

CPU 2, the cleanup loop will blindly decrement and call vfree() on

newinfo->chainstack[1].

Not a real-world bug, such allocation isn't expected to fail

in the first place.

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/29bf41a9b59aff9f6197df58641a00037d567ca8Refgit.kernel.org/stable/c/2ade612967e2cdfb9290ebcb773f302c82f311faRefgit.kernel.org/stable/c/42bef500d07b5769d916e9122a3e3fa3fd2245efRefgit.kernel.org/stable/c/5ee856e4208acafaaaf7b84824d39b78c21345d6Refgit.kernel.org/stable/c/9e6c5169db423e51dcc66a73fd15409c0d38e088Refgit.kernel.org/stable/c/9f74d28e903fa4fdf82f870d0aeadddc8196e41cRefgit.kernel.org/stable/c/cbfe53599eebffd188938ab6774cc41794f6f9d5Refgit.kernel.org/stable/c/fc7f105451044501a50cfd530cfa3b472c54acbc

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64413?

CVE-2026-64413 is a high-severity vulnerability. It was published on July 25, 2026 and has a CVSS 3.1 base score of 7.0 (HIGH).

How severe is CVE-2026-64413?

This vulnerability has a CVSS 3.1 base score of 7.0, 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-2026-64413?

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-2026-64413?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64413 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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