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CVE-2026-63937

8.8 high SSVC exploitation: none Analyzed
NVD · CVE.org

In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Use READ_ONCE() when reading entries/indices from PSC buffer Use READ_ONCE() when reading entries/indices from the guest-accessible Page State Change buffer to defend against TOCTOU bugs. Don't bother with READ_ONCE()/WRITE_ONCE() for cases where KVM is writing (and not consuming the result!), as the guest isn't supposed to touch the buffer while it's being processed. I.e. using READ_ONCE() is all about protecting against misbehaving guests.

Fix

Patch, vendor advisory and mitigation references on NVD 4

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

Change history 5

  1. Cpes+6 CPE criteria (now 6)NVD modified 2026-10-27 13:04
  2. StatusPublished → AnalyzedNVD modified 2026-10-27 13:04
  3. StatusAwaiting Analysis → PublishedNVD modified 2026-10-19 20:17
  4. CwesCWE-367NVD modified 2026-10-19 21:17
  5. First seenCVSS 8.8NVD 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 4