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CVE-2026-52994

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting virtio_transport_init_zcopy_skb() uses iter->count as the size argument…

Published Jun 24, 2026EPSS 0.13%

Overview

CVE-2026-52994 is a medium-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting

virtio_transport_init_zcopy_skb() uses iter->count as the size argument

for msg_zerocopy_realloc(), which in turn passes it to

mm_account_pinned_pages() for RLIMIT_MEMLOCK accounting. However, this

function is called after virtio_transport_fill_skb() has already consumed

the iterator via __zerocopy_sg_from_iter(), so on the last skb, iter->count

will be 0, skipping the RLIMIT_MEMLOCK enforcement.

Pass pkt_len (the total bytes being sent) as an explicit parameter to

virtio_transport_init_zcopy_skb() instead of reading the already-consumed

iter->count.

This matches TCP and UDP, which both call msg_zerocopy_realloc() with

the original message size.

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/1cb36e252211506f51095fe7ced8286cc77b4c80Refgit.kernel.org/stable/c/6af1736b5810bc8a4a43a8518530113f5a757dc1Refgit.kernel.org/stable/c/d0117950075f0a9d5944980784c719d8ebcd4bff

How CyberStrike helps

Frequently asked questions

What is CVE-2026-52994?

CVE-2026-52994 is a medium-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-52994?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-52994?

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-2026-52994?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-52994 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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