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CVE-2026-63938

Last refreshed2026-10-17

Status: UPDATED  |  Advisory ID: CVE-2026-63938

Key Details

CVECVE-2026-63938
CVSS Score / Version
9.3 (Critical) / CVSS v3.1
Updated2026-10-16
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS Prose
attack vector is local; attack complexity is low; privileges required is none; user interaction is none; scope is changed; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products
Linux Kernel

Affected Products, Subsystems & Sectors

VendorProductAffected VersionsPatch Status
LinuxLinux Kernel
SubsystemsOT Supporting Infrastructure
SectorsAll Sectors

What to Know

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.

What to Do

Monitor Linux's web page for any future patch releases.

References

SourceReference
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-63938
CVEhttps://www.cve.org/CVERecord?id=CVE-2026-63938

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