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CVE-2026-63937

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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:0b3473cf96a2046fb06677867bed6978a447e6ccc30eff361580f4e9c271ea97
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:v2:0f39962926b7f1e4cddf4fd6d6d08e19912214834ed674dd668db703ce21a875 · sha256:4b7d8f21545f3b0a… · /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":"bd232801ef1d1fd985d2d4ca3cd1d888303ca86f","status":"affected","version":"9b54e248d2644be71cb394eb85f31ad99e023a05","versionType":"git"},{"lessThan":"b1dfaa6f7a957726a6800135be3659fbe4bbf2a4","status":"affected","version":"9b54e248d2644be71cb394eb85f31ad99e023a05","versionType":"git"},{"lessThan":"edbbe88f83b524434974e84808d3093199d67c24","status":"affected","version":"9b54e248d2644be71cb394e…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0f39962926b7f1e4cddf4fd6d6d08e19912214834ed674dd668db703ce21a875 · sha256:4b7d8f21545f3b0a… · /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:v2:0f39962926b7f1e4cddf4fd6d6d08e19912214834ed674dd668db703ce21a875 · sha256:4b7d8f21545f3b0a… · /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":"bd232801ef1d1fd985d2d4ca3cd1d888303ca86f","status":"affected","version":"9b54e248d2644be71cb394eb85f31ad99e023a05","versionType":"git"},{"lessThan":"b1dfaa6f7a957726a6800135be3659fbe4bbf2a4","status":"affected","version":"9b54e248d2644be71cb394eb85f31ad99e023a05","versionType":"git"},{"lessThan":"edbbe88f83b524434974e84808d3093199d67c24","status":"affected","version":"9b54e248d2644be71cb394e…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:0f39962926b7f1e4cddf4fd6d6d08e19912214834ed674dd668db703ce21a875 · sha256:4b7d8f21545f3b0a… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/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:v2:0f39962926b7f1e4cddf4fd6d6d08e19912214834ed674dd668db703ce21a875 · sha256:4b7d8f21545f3b0a… · /containers/cna/metrics/0/cvssV3_1

Source references

4 source assertions
{"url":"https://git.kernel.org/stable/c/b1dfaa6f7a957726a6800135be3659fbe4bbf2a4"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0f39962926b7f1e4cddf4fd6d6d08e19912214834ed674dd668db703ce21a875 · sha256:4b7d8f21545f3b0a… · /containers/cna/references/1
{"url":"https://git.kernel.org/stable/c/bd232801ef1d1fd985d2d4ca3cd1d888303ca86f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0f39962926b7f1e4cddf4fd6d6d08e19912214834ed674dd668db703ce21a875 · sha256:4b7d8f21545f3b0a… · /containers/cna/references/0
{"url":"https://git.kernel.org/stable/c/c8cc238093ca6c99267032f6cfe78f59389f3157"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0f39962926b7f1e4cddf4fd6d6d08e19912214834ed674dd668db703ce21a875 · sha256:4b7d8f21545f3b0a… · /containers/cna/references/3
{"url":"https://git.kernel.org/stable/c/edbbe88f83b524434974e84808d3093199d67c24"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:0f39962926b7f1e4cddf4fd6d6d08e19912214834ed674dd668db703ce21a875 · sha256:4b7d8f21545f3b0a… · /containers/cna/references/2

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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