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CVE-2026-63940

9.3 critical SSVC exploitation: none Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 5

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 9

  1. CwesCWE-190 → CWE-191, CWE-190NVD modified 2026-10-28 18:31
  2. Cpes+6 CPE criteria (now 6)NVD modified 2026-10-28 18:31
  3. StatusPublished → AnalyzedNVD modified 2026-10-28 18:31
  4. StatusUndergoing Analysis → PublishedNVD modified 2026-10-21 12:42
  5. References+1 references (now 5)NVD modified 2026-10-21 13:19
  6. StatusPublished → Undergoing AnalysisNVD modified 2026-10-21 13:19
  7. StatusAwaiting Analysis → PublishedNVD modified 2026-10-19 20:17
  8. CwesCWE-190NVD modified 2026-10-19 21:17
  9. First seenCVSS 9.3NVD modified 2026-10-16 16:18

Affected (CPE criteria) 6

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:*

References 5