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Permalink CVE-2026-63938
9.3 CRITICAL
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Local (L)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): None (N)
  • User Interaction (UI): None (N)
  • Scope (S): Changed (C)
  • Confidentiality (C): High (H)
  • Integrity (I): High (H)
  • Availability (A): High (H)
  • Modified Attack Vector (MAV): Local (L)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Privileges Required (MPR): None (N)
  • Modified User Interaction (MUI): None (N)
  • Modified Confidentiality (MC): High (H)
  • Modified Scope (MS): Changed (C)
  • Modified Integrity (MI): High (H)
  • Modified Availability (MA): High (H)
created 6 days, 2 hours ago Activity log
  • Created & dismissed (max. allowed matches exceeded) suggestion 6 days, 2 hours ago
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 (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

Linux
  • <75c8d1d7291268b479794fba5808971dc2f5eaf3
  • =<6.18.*
  • <505a3b94535583e4265360e2621734e355ef263d
  • <5198f70c09a5f6e9e5f5a0a2c6b388f24294b176
  • =<7.0.*
  • =<6.12.*
  • <6.11
  • =<*
  • <121d88de56bc5c0ba0ce2f6381af67f948a7e7c1
  • ==6.11