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CVE-2026-63939

In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Compute the correct max length of the in-GHCB scratch area When setting the length of the GHCB scratch area, and the area is in the GHCB shared buffer, set the effective length of the scratch area to the max possible size given the start of the guest-provided pointer, and the end of the shared buffer. The code was "fine" when first introduced, as KVM doesn't consult the length of the buffer when emulating MMIO, beca
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:8d9ff930eb099bb877026684070890c4f81961bf65b1848d6bbbbc648bf24e8d
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":"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":"6ca9400d36005ffdca25f80186bea781c7e1dc4c","status":"affected","version":"9b54e248d2644be71cb394eb85f31ad99e023a05","versionType":"git"},{"lessThan":"9f0a9e780f02c02d025a190f1885e1d1d73b87bd","status":"affected","version":"9b54e248d2644be71cb394eb85f31ad99e023a05","versionType":"git"},{"lessThan":"6644565527c4c5f507088b1c9ddf72de47790b68","status":"affected","version":"9b54e248d2644be71cb394e…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e1bf00a71d784403bb08f3ecf08a8189a4c02cb0b33560a85309d80fca2853aa · sha256:5f0a3d105e59d171… · /containers/cna/affected/0

{"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:e1bf00a71d784403bb08f3ecf08a8189a4c02cb0b33560a85309d80fca2853aa · sha256:5f0a3d105e59d171… · /containers/cna/affected/1

Affected products and versions

2 source assertions
{"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":"6ca9400d36005ffdca25f80186bea781c7e1dc4c","status":"affected","version":"9b54e248d2644be71cb394eb85f31ad99e023a05","versionType":"git"},{"lessThan":"9f0a9e780f02c02d025a190f1885e1d1d73b87bd","status":"affected","version":"9b54e248d2644be71cb394eb85f31ad99e023a05","versionType":"git"},{"lessThan":"6644565527c4c5f507088b1c9ddf72de47790b68","status":"affected","version":"9b54e248d2644be71cb394e…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:e1bf00a71d784403bb08f3ecf08a8189a4c02cb0b33560a85309d80fca2853aa · sha256:5f0a3d105e59d171… · /containers/cna/affected/0
{"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:e1bf00a71d784403bb08f3ecf08a8189a4c02cb0b33560a85309d80fca2853aa · sha256:5f0a3d105e59d171… · /containers/cna/affected/1

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:e1bf00a71d784403bb08f3ecf08a8189a4c02cb0b33560a85309d80fca2853aa · sha256:5f0a3d105e59d171… · /containers/cna/metrics/0/cvssV3_1

Source references

4 source assertions
{"url":"https://git.kernel.org/stable/c/5867d7e202e09f037cefe77f7af4413c7c0fa088"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e1bf00a71d784403bb08f3ecf08a8189a4c02cb0b33560a85309d80fca2853aa · sha256:5f0a3d105e59d171… · /containers/cna/references/3
{"url":"https://git.kernel.org/stable/c/6644565527c4c5f507088b1c9ddf72de47790b68"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e1bf00a71d784403bb08f3ecf08a8189a4c02cb0b33560a85309d80fca2853aa · sha256:5f0a3d105e59d171… · /containers/cna/references/2
{"url":"https://git.kernel.org/stable/c/6ca9400d36005ffdca25f80186bea781c7e1dc4c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e1bf00a71d784403bb08f3ecf08a8189a4c02cb0b33560a85309d80fca2853aa · sha256:5f0a3d105e59d171… · /containers/cna/references/0
{"url":"https://git.kernel.org/stable/c/9f0a9e780f02c02d025a190f1885e1d1d73b87bd"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:e1bf00a71d784403bb08f3ecf08a8189a4c02cb0b33560a85309d80fca2853aa · sha256:5f0a3d105e59d171… · /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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