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…
Published: 2026-07-19 · CVSS: 9.3 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7