{"id":"CVE-2026-46071","state":"PUBLISHED","title":"KVM: nSVM: Avoid clearing VMCB_LBR in vmcb12","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nSVM: Avoid clearing VMCB_LBR in vmcb12\n\nsvm_copy_lbrs() always marks VMCB_LBR dirty in the destination VMCB.\nHowever, nested_svm_vmexit() uses it to copy LBRs to vmcb12, and\nclearing clean bits in vmcb12 is not architecturally defined.\n\nMove vmcb_mark_dirty() to callers and drop it for vmcb12.\n\nThis also facilitates incoming refactoring that does not pass the entire\nVMCB to svm_copy_lbrs().","publishedAt":"2026-05-27T12:57:57.316Z","updatedAt":"2026-10-30T12:25:59.492Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d20c796ca3709801f8a7fa36e8770a3dd8ebd34e","status":"affected","lessThan":"b7fefb393a926bdfe445c63b4091185ed7da2733","versionType":"git"},{"version":"d20c796ca3709801f8a7fa36e8770a3dd8ebd34e","status":"affected","lessThan":"165b08d2d1346dce5ed43db65e10f3194b9ae2fe","versionType":"git"},{"version":"d20c796ca3709801f8a7fa36e8770a3dd8ebd34e","status":"affected","lessThan":"11d347b7edf5093d69aca72317300798a32bfd6b","versionType":"git"},{"version":"d20c796ca3709801f8a7fa36e8770a3dd8ebd34e","status":"affected","lessThan":"a3f0981a5a0e0bd51ad74cc7d9eed32294b24002","versionType":"git"},{"version":"d20c796ca3709801f8a7fa36e8770a3dd8ebd34e","status":"affected","lessThan":"9efe23568806d1cd06f7d146f9b3037b8d585a9f","versionType":"git"},{"version":"d20c796ca3709801f8a7fa36e8770a3dd8ebd34e","status":"affected","lessThan":"b53ab5167a81537777ac780bbd93d32613aa3bda","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kvm/svm/nested.c","arch/x86/kvm/svm/svm.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.27","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.4","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kvm/svm/nested.c","arch/x86/kvm/svm/svm.c"]}],"references":["https://git.kernel.org/stable/c/b7fefb393a926bdfe445c63b4091185ed7da2733","https://git.kernel.org/stable/c/165b08d2d1346dce5ed43db65e10f3194b9ae2fe","https://git.kernel.org/stable/c/11d347b7edf5093d69aca72317300798a32bfd6b","https://git.kernel.org/stable/c/a3f0981a5a0e0bd51ad74cc7d9eed32294b24002","https://git.kernel.org/stable/c/9efe23568806d1cd06f7d146f9b3037b8d585a9f","https://git.kernel.org/stable/c/b53ab5167a81537777ac780bbd93d32613aa3bda"],"weaknesses":[],"ingestedAt":"2026-10-30T12:42:04.495Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/46xxx/CVE-2026-46071.json","commit":"db8103c5921aac81d5d90efcf3745980dafabf49","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46071","state":"PUBLISHED","datePublished":"2026-05-27T12:57:57.316Z","dateUpdated":"2026-10-30T12:25:59.492Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-13T15:03:33.095Z"},"containers":{"cna":{"title":"KVM: nSVM: Avoid clearing VMCB_LBR in vmcb12","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nSVM: Avoid clearing VMCB_LBR in vmcb12\n\nsvm_copy_lbrs() always marks VMCB_LBR dirty in the destination VMCB.\nHowever, nested_svm_vmexit() uses it to copy LBRs to vmcb12, and\nclearing clean bits in vmcb12 is not architecturally defined.\n\nMove vmcb_mark_dirty() to callers and drop it for vmcb12.\n\nThis also facilitates incoming refactoring that does not pass the entire\nVMCB to svm_copy_lbrs()."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d20c796ca3709801f8a7fa36e8770a3dd8ebd34e","status":"affected","lessThan":"b7fefb393a926bdfe445c63b4091185ed7da2733","versionType":"git"},{"version":"d20c796ca3709801f8a7fa36e8770a3dd8ebd34e","status":"affected","lessThan":"165b08d2d1346dce5ed43db65e10f3194b9ae2fe","versionType":"git"},{"version":"d20c796ca3709801f8a7fa36e8770a3dd8ebd34e","status":"affected","lessThan":"11d347b7edf5093d69aca72317300798a32bfd6b","versionType":"git"},{"version":"d20c796ca3709801f8a7fa36e8770a3dd8ebd34e","status":"affected","lessThan":"a3f0981a5a0e0bd51ad74cc7d9eed32294b24002","versionType":"git"},{"version":"d20c796ca3709801f8a7fa36e8770a3dd8ebd34e","status":"affected","lessThan":"9efe23568806d1cd06f7d146f9b3037b8d585a9f","versionType":"git"},{"version":"d20c796ca3709801f8a7fa36e8770a3dd8ebd34e","status":"affected","lessThan":"b53ab5167a81537777ac780bbd93d32613aa3bda","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kvm/svm/nested.c","arch/x86/kvm/svm/svm.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.19","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.27","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.4","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["arch/x86/kvm/svm/nested.c","arch/x86/kvm/svm/svm.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/b7fefb393a926bdfe445c63b4091185ed7da2733"},{"url":"https://git.kernel.org/stable/c/165b08d2d1346dce5ed43db65e10f3194b9ae2fe"},{"url":"https://git.kernel.org/stable/c/11d347b7edf5093d69aca72317300798a32bfd6b"},{"url":"https://git.kernel.org/stable/c/a3f0981a5a0e0bd51ad74cc7d9eed32294b24002"},{"url":"https://git.kernel.org/stable/c/9efe23568806d1cd06f7d146f9b3037b8d585a9f"},{"url":"https://git.kernel.org/stable/c/b53ab5167a81537777ac780bbd93d32613aa3bda"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:25:59.492Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"6.18.27"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"7.0.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.19","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}