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CVE PROGRAM SOURCE RECORD9.3 Critical

CVE-2026-63940

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

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 291bd20d5d88814a73d43b55b9428feab2f28094 to < c8aa0a79ab0b23cde4c46ccff78e63be35733e04affected
  • 291bd20d5d88814a73d43b55b9428feab2f28094 to < bbd3a27e4f99fdcad82d12d79c04a95dff1ff70baffected
  • 291bd20d5d88814a73d43b55b9428feab2f28094 to < 3b6035bc6bff20e89752ce4358bc4c9a9d5883f2affected
  • 291bd20d5d88814a73d43b55b9428feab2f28094 to < 2254972d4d69e279ba4e87bf0968eb08ad0d3c92affected
  • 291bd20d5d88814a73d43b55b9428feab2f28094 to < c30cde934c7813b4e3069765dac64ce3d31e34f2affected
  • 291bd20d5d88814a73d43b55b9428feab2f28094 to < 3988bd2723de407ae90fa7a6f6029b4e60238c58affected

Linux Linux

Default version status: affected

  • 5.11affected
  • 0 to < 5.11unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.95 to ≤ 6.12.*unaffected
  • 6.18.35 to ≤ 6.18.*unaffected
  • 7.0.12 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References