Get a Demo

Let's Patch It!

Book a short call with one our specialists, we'll walk you through how Endor Patches work, and ask you a few questions about your environment (like your primary programming languages and repository management). We'll also send you an email right after you fill out the form, feel free to reply with any questions you have in advance!

CVE

CVE-2026-63938

KVM: SEV: Check PSC request indices against the actual size of the buffer
Back to all
CVE

CVE-2026-63938

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

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.

Package Versions Affected

Package Version
patch Availability
No items found.

Automatically patch vulnerabilities without upgrading

Fix Without Upgrading
Detect compatible fix
Apply safe remediation
Fix with a single pull request

CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.3
-
3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://git.kernel.org/stable/c/121d88de56bc5c0ba0ce2f6381af67f948a7e7c1, https://git.kernel.org/stable/c/505a3b94535583e4265360e2621734e355ef263d, https://git.kernel.org/stable/c/5198f70c09a5f6e9e5f5a0a2c6b388f24294b176, https://git.kernel.org/stable/c/75c8d1d7291268b479794fba5808971dc2f5eaf3, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63938.json, https://nvd.nist.gov/vuln/detail/CVE-2026-63938, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

9.3

CVSS Score
0
10

Basic Information

Base CVSS
9.3
EPSS Probability
0.00185%
EPSS Percentile
0.08131%
Introduced Version
9b54e248d2644be71cb394eb85f31ad99e023a05,6.11.0,6.13.0,6.19.0,0
Fix Available
121d88de56bc5c0ba0ce2f6381af67f948a7e7c1,6.12.93,6.18.35,7.0.12,6.12.94-1,7.0.0-28.28~24.04.1,7.0.0-1016.16~24.04.1,7.0.0-28.28.1~24.04.3,0:6.12.0-206.104.3.3.el9uek,0:6.12.0-206.104.3.3.el10uek,1:6.18.35-68.127.amzn2023,1:1.0-0.amzn2023,1:6.12.94-123.174.amzn2023

Fix Critical Vulnerabilities Instantly

Secure your app without upgrading.
Fix Without Upgrading