CVE-2026-63938

critical · 9.3

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.

9.3

CVSS

0.2%

EPSS (exploit prob.)

8th

EPSS percentile

2026-07-19

Published

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-63938