PT-2026-61255 · Linux+1 · Linux Kernel+1
CVE-2026-63938
·
Published
2026-05-29
·
Updated
2026-09-07
CVSS v3.1
9.3
Critical
| Vector | AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
Linux kernel (affected versions not specified)
Description
An issue exists in the KVM SEV component when processing Page State Change (PSC) requests. The system fails to properly validate the PSC buffer against the effective size of the scratch area. This occurs if the guest provides a pointer that is not positioned exactly at the start of the GHCB shared buffer, potentially allowing requests to exceed the actual buffer size.
Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
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Weakness Enumeration
Related Identifiers
Affected Products
Linux Kernel
Ubuntu