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CVE PROGRAM SOURCE RECORD9.3 Critical

CVE-2026-63938

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

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 9b54e248d2644be71cb394eb85f31ad99e023a05 to < 5198f70c09a5f6e9e5f5a0a2c6b388f24294b176affected
  • 9b54e248d2644be71cb394eb85f31ad99e023a05 to < 75c8d1d7291268b479794fba5808971dc2f5eaf3affected
  • 9b54e248d2644be71cb394eb85f31ad99e023a05 to < 505a3b94535583e4265360e2621734e355ef263daffected
  • 9b54e248d2644be71cb394eb85f31ad99e023a05 to < 121d88de56bc5c0ba0ce2f6381af67f948a7e7c1affected

Linux Linux

Default version status: affected

  • 6.11affected
  • 0 to < 6.11unaffected
  • 6.12.93 to ≤ 6.12.*unaffected
  • 6.18.35 to ≤ 6.18.*unaffected
  • 7.0.12 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References