Riskcovery

CVE-2026-63938

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

State
Published
Severity
9.3 Critical
Published
Jul 19, 2026
Updated
Oct 19, 2026
Reserved
Jul 19, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.19.3 CriticalCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HLinux

Weaknesses

Affected Products

ProductVersions
LinuxLinux
  • 9b54e248d2644be71cb394eb85f31ad99e023a05 to before 5198f70c09a5f6e9e5f5a0a2c6b388f24294b176Affected
  • 9b54e248d2644be71cb394eb85f31ad99e023a05 to before 75c8d1d7291268b479794fba5808971dc2f5eaf3Affected
  • 9b54e248d2644be71cb394eb85f31ad99e023a05 to before 505a3b94535583e4265360e2621734e355ef263dAffected
  • 9b54e248d2644be71cb394eb85f31ad99e023a05 to before 121d88de56bc5c0ba0ce2f6381af67f948a7e7c1Affected
LinuxLinux
  • 6.11Affected
  • before 6.11Not affected
  • 6.12.93 through 6.12.*Not affected
  • 6.18.35 through 6.18.*Not affected
  • 7.0.12 through 7.0.*Not affected
  • 7.1 and laterNot affected

References

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