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CVE-2026-63938

In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Check PSC request indices against the actual size of the buffer When processing Page State Change (PSC) requests, validate the PSC buffer against the effective size of the scratch area, which could be less than the maximum size if the guest provided a pointer that isn't exactly at the start of the GHCB shared buffer.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:26f841788f5c754874b9b0f2e64b738d60904fd63c750433b103b57efeaf925b
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"defaultStatus":"affected","product":"Linux","programFiles":["arch/x86/kvm/svm/sev.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.11"},{"lessThan":"6.11","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.93","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.35","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.12","versionType":"semver"},{"lessThanO…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:eb352dbdb348a7d7c20ce4ce58496ea3eae40f31ada1cfc2b76fda5531b104ca · sha256:21c9b2dc3e5b0f2c… · /containers/cna/affected/1

{"defaultStatus":"unaffected","product":"Linux","programFiles":["arch/x86/kvm/svm/sev.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"5198f70c09a5f6e9e5f5a0a2c6b388f24294b176","status":"affected","version":"9b54e248d2644be71cb394eb85f31ad99e023a05","versionType":"git"},{"lessThan":"75c8d1d7291268b479794fba5808971dc2f5eaf3","status":"affected","version":"9b54e248d2644be71cb394eb85f31ad99e023a05","versionType":"git"},{"lessThan":"505a3b94535583e4265360e2621734e355ef263d","status":"affected","version":"9b54e248d2644be71cb394e…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:eb352dbdb348a7d7c20ce4ce58496ea3eae40f31ada1cfc2b76fda5531b104ca · sha256:21c9b2dc3e5b0f2c… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"defaultStatus":"affected","product":"Linux","programFiles":["arch/x86/kvm/svm/sev.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.11"},{"lessThan":"6.11","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.93","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.35","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.12","versionType":"semver"},{"lessThanO…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:eb352dbdb348a7d7c20ce4ce58496ea3eae40f31ada1cfc2b76fda5531b104ca · sha256:21c9b2dc3e5b0f2c… · /containers/cna/affected/1
{"defaultStatus":"unaffected","product":"Linux","programFiles":["arch/x86/kvm/svm/sev.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"5198f70c09a5f6e9e5f5a0a2c6b388f24294b176","status":"affected","version":"9b54e248d2644be71cb394eb85f31ad99e023a05","versionType":"git"},{"lessThan":"75c8d1d7291268b479794fba5808971dc2f5eaf3","status":"affected","version":"9b54e248d2644be71cb394eb85f31ad99e023a05","versionType":"git"},{"lessThan":"505a3b94535583e4265360e2621734e355ef263d","status":"affected","version":"9b54e248d2644be71cb394e…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:eb352dbdb348a7d7c20ce4ce58496ea3eae40f31ada1cfc2b76fda5531b104ca · sha256:21c9b2dc3e5b0f2c… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":9.3,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:eb352dbdb348a7d7c20ce4ce58496ea3eae40f31ada1cfc2b76fda5531b104ca · sha256:21c9b2dc3e5b0f2c… · /containers/cna/metrics/0/cvssV3_1

Source references

4 source assertions
{"url":"https://git.kernel.org/stable/c/121d88de56bc5c0ba0ce2f6381af67f948a7e7c1"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:eb352dbdb348a7d7c20ce4ce58496ea3eae40f31ada1cfc2b76fda5531b104ca · sha256:21c9b2dc3e5b0f2c… · /containers/cna/references/3
{"url":"https://git.kernel.org/stable/c/505a3b94535583e4265360e2621734e355ef263d"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:eb352dbdb348a7d7c20ce4ce58496ea3eae40f31ada1cfc2b76fda5531b104ca · sha256:21c9b2dc3e5b0f2c… · /containers/cna/references/2
{"url":"https://git.kernel.org/stable/c/5198f70c09a5f6e9e5f5a0a2c6b388f24294b176"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:eb352dbdb348a7d7c20ce4ce58496ea3eae40f31ada1cfc2b76fda5531b104ca · sha256:21c9b2dc3e5b0f2c… · /containers/cna/references/0
{"url":"https://git.kernel.org/stable/c/75c8d1d7291268b479794fba5808971dc2f5eaf3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:eb352dbdb348a7d7c20ce4ce58496ea3eae40f31ada1cfc2b76fda5531b104ca · sha256:21c9b2dc3e5b0f2c… · /containers/cna/references/1

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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