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CVE-2026-52912

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_queue: hold bridge skb->dev while queued br_pass_frame_up() rewrites skb->dev from the ingress port to the bridge…

Published Jun 24, 2026CWE-416EPSS 0.16%

Overview

CVE-2026-52912 is a high-severity vulnerability. It was published on June 24, 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: nf_queue: hold bridge skb->dev while queued

br_pass_frame_up() rewrites skb->dev from the ingress port to the bridge

master before queueing bridge LOCAL_IN packets. NFQUEUE only holds

references on state.in/out and bridge physdevs, so a queued bridge

packet can retain a freed bridge master in skb->dev until reinjection.

When the verdict is reinjected later, br_netif_receive_skb() re-enters

the receive path with skb->dev still pointing at the freed bridge master,

triggering a use-after-free.

Store skb->dev in the queue entry, hold a reference on it for the queue

lifetime, and use the saved device when dropping queued packets during

NETDEV_DOWN handling.

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/15d464265120ab9818bd673af301deee09bedab2Refgit.kernel.org/stable/c/19924bdd8a45ebc72a7b84c57fd63057d1dc75acRefgit.kernel.org/stable/c/1e5e20031c5eee8d2e490a90ff4d6a2feecfc3beRefgit.kernel.org/stable/c/3823c27099cfe2482299065814adbaa771be9644Refgit.kernel.org/stable/c/3fb0f5c0f64162a8c3f25616a4f1e340b921737fRefgit.kernel.org/stable/c/950d809f154dca04e5fbe5d3c8b9c5e44769cd57Refgit.kernel.org/stable/c/a698ac8ab2561cf575d2d9f34095032651dd952eRefgit.kernel.org/stable/c/e196115ec330a18de415bdb9f5071aa9f08e53ce

How CyberStrike helps

Frequently asked questions

What is CVE-2026-52912?

CVE-2026-52912 is a high-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-52912?

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-2026-52912?

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-2026-52912?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-52912 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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