PT-2026-61255 · Linux · Linux

CVE-2026-63938 · Published 2026-07-19 · Updated 2026-07-19

Mitre

CVSS v3.1

9.3

Critical

Base vector

AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

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.

Fix

Related Identifiers

CVE-2026-63938

Affected Products

Linux

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-63938 · Security Note
• https://git.kernel.org/stable/c/5198f70c09a5f6e9e5f5a0a2c6b388f24294b176 · Note
• https://git.kernel.org/stable/c/75c8d1d7291268b479794fba5808971dc2f5eaf3 · Note
• https://git.kernel.org/stable/c/505a3b94535583e4265360e2621734e355ef263d · Note
• https://git.kernel.org/stable/c/121d88de56bc5c0ba0ce2f6381af67f948a7e7c1 · Note