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CVE-2026-63970

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: bind uarg before filling zerocopy skb virtio_transport_send_pkt_info() allocates or reuses the zerocopy uarg befo…

Published Jul 19, 2026EPSS 0.18%

Overview

CVE-2026-63970 is a high-severity vulnerability. It was published on July 19, 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:

vsock/virtio: bind uarg before filling zerocopy skb

virtio_transport_send_pkt_info() allocates or reuses the zerocopy uarg

before entering the send loop, but virtio_transport_alloc_skb() still

fills the skb before it inherits that uarg. When fixed-buffer vectored

zerocopy hits MAX_SKB_FRAGS, io_sg_from_iter() may partially attach

managed frags and return -EMSGSIZE. The rollback path call kfree_skb()

to free an skb that carries SKBFL_MANAGED_FRAG_REFS but no uarg, so

skb_release_data() falls through to ordinary frag unref.

Pass the uarg into virtio_transport_alloc_skb() and bind it immediately

before virtio_transport_fill_skb(). This keeps control or no-payload skbs

untouched while ensuring success and rollback share one lifetime rule.

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/1e584c304cfb94a759417130b1fc6d30b30c4cceRefgit.kernel.org/stable/c/5d317573f1d48e76cce5fb6250452b6e4102e0fbRefgit.kernel.org/stable/c/72194f65050958e4c8e069adb6c5d89ef81ca197Refgit.kernel.org/stable/c/b62e2b2b4a50953ca952f3cd3f77dd62dc50fd5d

How CyberStrike helps

Frequently asked questions

What is CVE-2026-63970?

CVE-2026-63970 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-63970?

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-2026-63970?

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-2026-63970?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-63970 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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