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CVE-2026-53212

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_tunnel: fix use-after-free on object destroy nft_tunnel_obj_destroy() calls metadata_dst_free() which directly k…

Published Jun 25, 2026CWE-416EPSS 0.19%

Overview

CVE-2026-53212 is a high-severity vulnerability. It was published on June 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:

netfilter: nft_tunnel: fix use-after-free on object destroy

nft_tunnel_obj_destroy() calls metadata_dst_free() which directly

kfree()s the metadata_dst, ignoring the dst_entry refcount. Packets

that took a reference via dst_hold() in nft_tunnel_obj_eval() and

are still queued (e.g. in a netem qdisc) are left with a dangling

pointer. When these packets are eventually dequeued, dst_release()

operates on freed memory.

Replace metadata_dst_free() with dst_release() so the metadata_dst

is freed only after all references are dropped. The dst subsystem

already handles metadata_dst cleanup in dst_destroy() when

DST_METADATA 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/349df61526d2e39decc685d246202e3e284cfe05Refgit.kernel.org/stable/c/55b79b1ae42372012413ce0413181d26679b17efRefgit.kernel.org/stable/c/5e9ee18b27fde88cb6148202b33916c66693fe82Refgit.kernel.org/stable/c/8767fe4079affa74314d7eb3220e700150289842Refgit.kernel.org/stable/c/941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3Refgit.kernel.org/stable/c/c32b26aaa2f9216520a38b3f4bfeec846eb3eb8aRefgit.kernel.org/stable/c/f9a0e4b61054cde89a2a77845293c726cc07cc43Refgit.kernel.org/stable/c/fda6573a46ad24f35348e024905ee5bdf729797e

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53212?

CVE-2026-53212 is a high-severity vulnerability. It was published on June 25, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-53212?

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-2026-53212?

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-2026-53212?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53212 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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