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CVE-2026-63937

8.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Use READ_ONCE() when reading entries/indices from PSC buffer Use READ_ONCE() when reading entries/indices from the gu…

Published Jul 19, 2026EPSS 0.18%

Overview

CVE-2026-63937 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, 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:

KVM: SEV: Use READ_ONCE() when reading entries/indices from PSC buffer

Use READ_ONCE() when reading entries/indices from the guest-accessible

Page State Change buffer to defend against TOCTOU bugs.

Don't bother with READ_ONCE()/WRITE_ONCE() for cases where KVM is writing

(and not consuming the result!), as the guest isn't supposed to touch the

buffer while it's being processed. I.e. using READ_ONCE() is all about

protecting against misbehaving guests.

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/b1dfaa6f7a957726a6800135be3659fbe4bbf2a4Refgit.kernel.org/stable/c/bd232801ef1d1fd985d2d4ca3cd1d888303ca86fRefgit.kernel.org/stable/c/c8cc238093ca6c99267032f6cfe78f59389f3157Refgit.kernel.org/stable/c/edbbe88f83b524434974e84808d3093199d67c24

How CyberStrike helps

Frequently asked questions

What is CVE-2026-63937?

CVE-2026-63937 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-63937?

This vulnerability has a CVSS 3.1 base score of 8.8, 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-2026-63937?

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-2026-63937?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-63937 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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