Riskcovery

CVE-2026-63940

KVM: SEV: Ignore Port I/O requests of length '0'

State
Published
Severity
9.3 Critical
Published
Jul 19, 2026
Updated
Oct 30, 2026
Reserved
Jul 19, 2026

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

KVM: SEV: Ignore Port I/O requests of length '0'

Explicitly ignore Port I/O requests of length '0' (or count '0'), so that setting up the software scratch area (and other code) doesn't have to worry about underflowing the length, and to allow for WARNing on trying to configure the scratch area with len==0.

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

  • CWE-190 Integer Overflow or Wraparound

Affected Products

ProductVersions
LinuxLinux
  • 291bd20d5d88814a73d43b55b9428feab2f28094 to before c8aa0a79ab0b23cde4c46ccff78e63be35733e04Affected
  • 291bd20d5d88814a73d43b55b9428feab2f28094 to before bbd3a27e4f99fdcad82d12d79c04a95dff1ff70bAffected
  • 291bd20d5d88814a73d43b55b9428feab2f28094 to before 3b6035bc6bff20e89752ce4358bc4c9a9d5883f2Affected
  • 291bd20d5d88814a73d43b55b9428feab2f28094 to before 2254972d4d69e279ba4e87bf0968eb08ad0d3c92Affected
  • 291bd20d5d88814a73d43b55b9428feab2f28094 to before c30cde934c7813b4e3069765dac64ce3d31e34f2Affected
  • 291bd20d5d88814a73d43b55b9428feab2f28094 to before 3988bd2723de407ae90fa7a6f6029b4e60238c58Affected
LinuxLinux
  • 5.11Affected
  • before 5.11Not affected
  • 6.1.191 through 6.1.*Not affected
  • 6.6.160 through 6.6.*Not affected
  • 6.12.95 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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