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CVE-2026-63939

🗓️ 19 Jul 2026 14:55:35Reported by LinuxType 
cve
 cve
🔗 web.nvd.nist.gov👁 11 Views

Fixed KVM SEV bug computing max GHCB scratch area length; uses minimum length and bounds to prevent overflows.

Related
Detection
Affected
Refs
ReporterTitlePublishedViews
Family
Cvelist
CVE-2026-63939 KVM: SEV: Compute the correct max length of the in-GHCB scratch area
19 Jul 202614:55
cvelist
EUVD
EUVD-2026-45712
19 Jul 202614:55
euvd
NVD
CVE-2026-63939
19 Jul 202616:17
nvd
OSV
CVE-2026-63939 KVM: SEV: Compute the correct max length of the in-GHCB scratch area
19 Jul 202614:55
osv
OSV
DEBIAN-CVE-2026-63939
19 Jul 202616:17
osv
OSV
UBUNTU-CVE-2026-63939
20 Jul 202600:00
osv
Positive Technologies
PT-2026-61256
19 Jul 202600:00
ptsecurity
Vulners
CNA
Node
OR
linuxlinux_kernelRange6.116.12.93
linuxlinux_kernelRange6.13.06.18.35
linuxlinux_kernelRange6.19.07.0.12
linuxlinux_kernelRange7.1.0
[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "arch/x86/kvm/svm/sev.c"
    ],
    "versions": [
      {
        "version": "9b54e248d2644be71cb394eb85f31ad99e023a05",
        "lessThan": "6ca9400d36005ffdca25f80186bea781c7e1dc4c",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "9b54e248d2644be71cb394eb85f31ad99e023a05",
        "lessThan": "9f0a9e780f02c02d025a190f1885e1d1d73b87bd",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "9b54e248d2644be71cb394eb85f31ad99e023a05",
        "lessThan": "6644565527c4c5f507088b1c9ddf72de47790b68",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "9b54e248d2644be71cb394eb85f31ad99e023a05",
        "lessThan": "5867d7e202e09f037cefe77f7af4413c7c0fa088",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "arch/x86/kvm/svm/sev.c"
    ],
    "versions": [
      {
        "version": "6.11",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.11",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.12.93",
        "lessThanOrEqual": "6.12.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.18.35",
        "lessThanOrEqual": "6.18.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.0.12",
        "lessThanOrEqual": "7.0.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.1",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]

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20 Jul 2026 15:16Current
5.7Medium risk
Vulners AI Score5.7
CVSS 3.19.3
EPSS0.00216
11