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CVE-2026-53218

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_exthdr: fix register tracking for F_PRESENT flag nft_exthdr_init() passes user-controlled priv->len to nft_parse…

Published Jun 25, 2026CWE-908EPSS 0.13%

Overview

CVE-2026-53218 is a medium-severity vulnerability. It was published on June 25, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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: nft_exthdr: fix register tracking for F_PRESENT flag

nft_exthdr_init() passes user-controlled priv->len to

nft_parse_register_store(), which marks that many bytes in the

register bitmap as initialized. However, when NFT_EXTHDR_F_PRESENT

is set, the eval paths write only 1 byte (nft_reg_store8) or

4 bytes (*dest = 0 on TCP/DCCP error path). When len > 4,

registers beyond the first are never written, retaining

uninitialized stack data from nft_regs.

Bail out if userspace requests too much data when F_PRESENT is set.

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/19748967d59c31d24d21d40b728570788310b237Refgit.kernel.org/stable/c/46fc15a044e9938e7ea77786fb37edd2cd74f031Refgit.kernel.org/stable/c/67b27434c43b68a97becda98c9f0c8cf6cba2134Refgit.kernel.org/stable/c/772cecf198da732faebb5dcfc46d66a505be8495Refgit.kernel.org/stable/c/78069a6d8bc86c9e036eb82c2af4a19cc1871a53Refgit.kernel.org/stable/c/8738b1b6d0e639ca1fc0f61516afd3557ac4ecc6Refgit.kernel.org/stable/c/cd513e43b4b2bd1de39e2367bc4261c699a8652fRefgit.kernel.org/stable/c/f08fb3d42fd3aad0b7a263da3ac3ebaf0845e265

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53218?

CVE-2026-53218 is a medium-severity vulnerability. It was published on June 25, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-53218?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-53218?

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-2026-53218?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53218 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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