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CVE-2026-46320

7.4 · HIGH

In the Linux kernel, the following vulnerability has been resolved: tap: free page on error paths in tap_get_user_xdp() tap_get_user_xdp() rejects a frame shorter than ETH_HLEN with -EINVAL, and…

Published Jun 9, 2026EPSS 0.25%

Overview

CVE-2026-46320 is a high-severity vulnerability. It was published on June 9, 2026 and has a CVSS 3.1 base score of 7.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

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

tap: free page on error paths in tap_get_user_xdp()

tap_get_user_xdp() rejects a frame shorter than ETH_HLEN with -EINVAL,

and returns -ENOMEM when build_skb() fails. Both paths jump to the err

label without freeing the page that vhost_net_build_xdp() allocated for

the frame. tap_sendmsg() discards the per-buffer return value and always

returns 0, so vhost_tx_batch() takes the success path and never frees

the page; each rejected frame in a batch leaks one page-frag chunk.

Free the page on both error paths, before the skb is built. This is the

tap counterpart of the same leak in tun_xdp_one().

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/18a84c35842e19cd3c5534d8cee73d31863f696dRefgit.kernel.org/stable/c/3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2Refgit.kernel.org/stable/c/3f52a86a482a69294c50a5a2a097bd6f4104990aRefgit.kernel.org/stable/c/8d03e65eb6cfbffec471a6b65416f93679bf3286Refgit.kernel.org/stable/c/d30aac0fa00ca0afc3e08174cf7f974a66bdcf05Refgit.kernel.org/stable/c/d68eab61944a9b0826fa2e954e42db1aa3201b7aRefgit.kernel.org/stable/c/e27c17346628cb56843a83f93ac63c314c00f388Refgit.kernel.org/stable/c/f979971835dddbca86cf99e3b2e2b94a408a1ab2

How CyberStrike helps

Frequently asked questions

What is CVE-2026-46320?

CVE-2026-46320 is a high-severity vulnerability. It was published on June 9, 2026 and has a CVSS 3.1 base score of 7.4 (HIGH).

How severe is CVE-2026-46320?

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-46320?

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-2026-46320?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-46320 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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