Vulnerability Description
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.
CVSS Score
CRITICAL
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
FAQ
What is CVE-2026-63938?
CVE-2026-63938 is a vulnerability with a CVSS score of 9.3 (CRITICAL). 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, valida...
How severe is CVE-2026-63938?
CVE-2026-63938 has been rated CRITICAL with a CVSS base score of 9.3/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-63938?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.