{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43483","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-05-01T14:12:56.012Z","datePublished":"2026-05-13T15:08:30.319Z","dateUpdated":"2026-05-13T15:08:30.319Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-13T15:08:30.319Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: Set/clear CR8 write interception when AVIC is (de)activated\n\nExplicitly set/clear CR8 write interception when AVIC is (de)activated to\nfix a bug where KVM leaves the interception enabled after AVIC is\nactivated.  E.g. if KVM emulates INIT=>WFS while AVIC is deactivated, CR8\nwill remain intercepted in perpetuity.\n\nOn its own, the dangling CR8 intercept is \"just\" a performance issue, but\ncombined with the TPR sync bug fixed by commit d02e48830e3f (\"KVM: SVM:\nSync TPR from LAPIC into VMCB::V_TPR even if AVIC is active\"), the danging\nintercept is fatal to Windows guests as the TPR seen by hardware gets\nwildly out of sync with reality.\n\nNote, VMX isn't affected by the bug as TPR_THRESHOLD is explicitly ignored\nwhen Virtual Interrupt Delivery is enabled, i.e. when APICv is active in\nKVM's world.  I.e. there's no need to trigger update_cr8_intercept(), this\nis firmly an SVM implementation flaw/detail.\n\nWARN if KVM gets a CR8 write #VMEXIT while AVIC is active, as KVM should\nnever enter the guest with AVIC enabled and CR8 writes intercepted.\n\n[Squash fix to avic_deactivate_vmcb. - Paolo]"}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kvm/svm/avic.c","arch/x86/kvm/svm/svm.c"],"versions":[{"version":"3bbf3565f48ce3999b5a12cde946f81bd4475312","lessThan":"a4123fe5d9122eef9852e4921f7cc463420f30d4","status":"affected","versionType":"git"},{"version":"3bbf3565f48ce3999b5a12cde946f81bd4475312","lessThan":"816fa1dfae4532e851b1fe6b2434c753ecbd86c7","status":"affected","versionType":"git"},{"version":"3bbf3565f48ce3999b5a12cde946f81bd4475312","lessThan":"01651e7751edbbc0fb4598f8367a3dabcfc8c182","status":"affected","versionType":"git"},{"version":"3bbf3565f48ce3999b5a12cde946f81bd4475312","lessThan":"ba3bca40f9f25c053f69413e5f4a41dd0fd762bf","status":"affected","versionType":"git"},{"version":"3bbf3565f48ce3999b5a12cde946f81bd4475312","lessThan":"737410b32bd615b321da4fbeda490351b9af5e8b","status":"affected","versionType":"git"},{"version":"3bbf3565f48ce3999b5a12cde946f81bd4475312","lessThan":"87d0f901a9bd8ae6be57249c737f20ac0cace93d","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kvm/svm/avic.c","arch/x86/kvm/svm/svm.c"],"versions":[{"version":"4.7","status":"affected"},{"version":"0","lessThan":"4.7","status":"unaffected","versionType":"semver"},{"version":"6.1.167","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.130","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.78","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.19","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.9","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.1.167"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.6.130"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.12.78"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.18.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.19.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/a4123fe5d9122eef9852e4921f7cc463420f30d4"},{"url":"https://git.kernel.org/stable/c/816fa1dfae4532e851b1fe6b2434c753ecbd86c7"},{"url":"https://git.kernel.org/stable/c/01651e7751edbbc0fb4598f8367a3dabcfc8c182"},{"url":"https://git.kernel.org/stable/c/ba3bca40f9f25c053f69413e5f4a41dd0fd762bf"},{"url":"https://git.kernel.org/stable/c/737410b32bd615b321da4fbeda490351b9af5e8b"},{"url":"https://git.kernel.org/stable/c/87d0f901a9bd8ae6be57249c737f20ac0cace93d"}],"title":"KVM: SVM: Set/clear CR8 write interception when AVIC is (de)activated","x_generator":{"engine":"bippy-1.2.0"}}}}