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CVE-2026-63940

🗓️ 19 Jul 2026 14:55:36Reported by LinuxType 
cve
 cve
🔗 web.nvd.nist.gov👁 5 Views

CVE-2026-63940 fixes KVM SEV by ignoring Port I/O requests with zero length to prevent underflow.

Related
Detection
Affected
Refs
ReporterTitlePublishedViews
Family
Cvelist
CVE-2026-63940 KVM: SEV: Ignore Port I/O requests of length '0'
19 Jul 202614:55
cvelist
EUVD
EUVD-2026-45713
19 Jul 202614:55
euvd
NVD
CVE-2026-63940
19 Jul 202616:17
nvd
OSV
CVE-2026-63940 KVM: SEV: Ignore Port I/O requests of length '0'
19 Jul 202614:55
osv
OSV
DEBIAN-CVE-2026-63940
19 Jul 202616:17
osv
OSV
UBUNTU-CVE-2026-63940
20 Jul 202600:00
osv
Positive Technologies
PT-2026-61257
19 Jul 202600:00
ptsecurity
Tenable Nessus
Linux Distros Unpatched Vulnerability : CVE-2026-63940
20 Jul 202600:00
nessus
Vulners
CNA
Node
OR
linuxlinux_kernelRange5.116.12.95
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": "291bd20d5d88814a73d43b55b9428feab2f28094",
        "lessThan": "3b6035bc6bff20e89752ce4358bc4c9a9d5883f2",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "291bd20d5d88814a73d43b55b9428feab2f28094",
        "lessThan": "2254972d4d69e279ba4e87bf0968eb08ad0d3c92",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "291bd20d5d88814a73d43b55b9428feab2f28094",
        "lessThan": "c30cde934c7813b4e3069765dac64ce3d31e34f2",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "291bd20d5d88814a73d43b55b9428feab2f28094",
        "lessThan": "3988bd2723de407ae90fa7a6f6029b4e60238c58",
        "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": "5.11",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.11",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.12.95",
        "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
5.4Medium risk
Vulners AI Score5.4
CVSS 3.19.3
EPSS0.002
5