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Critical severity9.3NVD Advisory· Published Jul 19, 2026· Updated Oct 16, 2026

CVE-2026-63938

CVE-2026-63938

Description

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

KVM: SEV: Check PSC request indices against the actual size of the buffer

When processing Page State Change (PSC) requests, validate the PSC buffer against the effective size of the scratch area, which could be less than the maximum size if the guest provided a pointer that isn't exactly at the start of the GHCB shared buffer.

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Affected products

15

Patches

Vulnerability mechanics

References

4

News mentions

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