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CVE-2026-52981

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: neigh: let neigh_xmit take skb ownership neigh_xmit always releases the skb, except when no neighbour table is found.

Published Jun 24, 2026CWE-401EPSS 0.53%

Overview

CVE-2026-52981 is a high-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

neigh: let neigh_xmit take skb ownership

neigh_xmit always releases the skb, except when no neighbour table is

found. But even the first added user of neigh_xmit (mpls) relied on

neigh_xmit to release the skb (or queue it for tx).

sashiko reported:

If neigh_xmit() is called with an uninitialized neighbor table (for

example, NEIGH_ND_TABLE when IPv6 is disabled), it returns -EAFNOSUPPORT

and bypasses its internal out_kfree_skb error path. Because the return

value of neigh_xmit() is ignored here, does this leak the SKB?

Assume full ownership and remove the last code path that doesn't

xmit or free skb.

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/0084712e0bee204b284510cdb63182fd5a30c2b7Refgit.kernel.org/stable/c/4438113be604ee67a7bf4f81da6e1cca41332ce4Refgit.kernel.org/stable/c/445e45a2c3a078316a62d2d331a570cf34ef5079Refgit.kernel.org/stable/c/63063ba60d2dc334e34f1e3f9271d7f3f6f30307Refgit.kernel.org/stable/c/8a89054a1ec0767aec25ed2bbac933da6ba3cf5aRefgit.kernel.org/stable/c/9247d59ca15bf60a57dca08103f055d8a4340877

How CyberStrike helps

Frequently asked questions

What is CVE-2026-52981?

CVE-2026-52981 is a high-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-52981?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-52981?

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-2026-52981?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-52981 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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