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CVE-2026-46322

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: tun: free page on build_skb failure in tun_xdp_one() When build_skb() fails in tun_xdp_one(), the function sets ret to -ENOMEM…

Published Jun 9, 2026EPSS 0.13%

Overview

CVE-2026-46322 is a high-severity vulnerability. It was published on June 9, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, 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:

tun: free page on build_skb failure in tun_xdp_one()

When build_skb() fails in tun_xdp_one(), the function sets ret to

-ENOMEM and jumps to the out label, which returns without freeing the

page that vhost_net_build_xdp() allocated for the frame. As with the

short-frame rejection path, tun_sendmsg() discards the per-buffer error

and still returns total_len, so vhost_tx_batch() takes the success path

and never frees the page. Each build_skb() failure in a batch leaks one

page-frag chunk.

Free the page before taking the error path, matching the put_page() the

other error exits of tun_xdp_one() already perform.

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/2638a9c1521905bb5c5d1e95c8fbc09f79148ed7Refgit.kernel.org/stable/c/26fe549b5192536b6c1c68a2dfdc8c0dcf9fa4a9Refgit.kernel.org/stable/c/4fefc6156a162a9f50035c12091a5e5130c82c6eRefgit.kernel.org/stable/c/60d9c0d6cdde5420d6483c921b16fe5465eb5238Refgit.kernel.org/stable/c/793385c154771603b8671dd8338927221e9d8d78Refgit.kernel.org/stable/c/aa308e9dbb9acb17cacdbbce9e4504f69bac8385Refgit.kernel.org/stable/c/aa8963fdce667a42fb7f0bdd2909fadcab02f9a8Refgit.kernel.org/stable/c/d16e38fac09a47bfcf98c1ad65a1bb53f94540f5

How CyberStrike helps

Frequently asked questions

What is CVE-2026-46322?

CVE-2026-46322 is a high-severity vulnerability. It was published on June 9, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-46322?

This vulnerability has a CVSS 3.1 base score of 7.1, 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-2026-46322?

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-2026-46322?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-46322 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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