{"id":"CVE-2026-46032","state":"PUBLISHED","title":"KVM: nSVM: Triple fault if restore host CR3 fails on nested #VMEXIT","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nSVM: Triple fault if restore host CR3 fails on nested #VMEXIT\n\nIf loading L1's CR3 fails on a nested #VMEXIT, nested_svm_vmexit()\nreturns an error code that is ignored by most callers, and continues to\nrun L1 with corrupted state. A sane recovery is not possible in this\ncase, and HW behavior is to cause a shutdown. Inject a triple fault\ninstead, and do not return early from nested_svm_vmexit(). Continue\ncleaning up the vCPU state (e.g. clear pending exceptions), to handle\nthe failure as gracefully as possible.\n\nFrom the APM:\n\n  Upon #VMEXIT, the processor performs the following actions in order to\n  return to the host execution context:\n\n  ...\n\n  if (illegal host state loaded, or exception while loading host state)\n      shutdown\n  else\n      execute first host instruction following the VMRUN\n\nRemove the return value of nested_svm_vmexit(), which is mostly\nunchecked anyway.","publishedAt":"2026-05-27T12:56:41.159Z","updatedAt":"2026-10-30T12:25:57.350Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d82aaef9c88aa27bce63751d6d6329920b1fe8da","status":"affected","lessThan":"e6318570a9b4e137b0b744832b920b38bb069561","versionType":"git"},{"version":"d82aaef9c88aa27bce63751d6d6329920b1fe8da","status":"affected","lessThan":"2e661773890e6ba6b16064fad961da3dd311be43","versionType":"git"},{"version":"d82aaef9c88aa27bce63751d6d6329920b1fe8da","status":"affected","lessThan":"af79992ecdb6817970d757fb5d853b8d9b55a0d6","versionType":"git"},{"version":"d82aaef9c88aa27bce63751d6d6329920b1fe8da","status":"affected","lessThan":"b0eb0a8959ac2b808eb11548d002fe1f9b5650cc","versionType":"git"},{"version":"d82aaef9c88aa27bce63751d6d6329920b1fe8da","status":"affected","lessThan":"9a738cf170a4a2332ea3a15e23ec65b5757fe4a1","versionType":"git"},{"version":"d82aaef9c88aa27bce63751d6d6329920b1fe8da","status":"affected","lessThan":"5d291ef0585ed880ed4dd71ea1a5965e0a65fb53","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","arch/x86/kvm/svm/svm.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.9","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":"6.18.57","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","arch/x86/kvm/svm/svm.h"]}],"references":["https://git.kernel.org/stable/c/e6318570a9b4e137b0b744832b920b38bb069561","https://git.kernel.org/stable/c/2e661773890e6ba6b16064fad961da3dd311be43","https://git.kernel.org/stable/c/af79992ecdb6817970d757fb5d853b8d9b55a0d6","https://git.kernel.org/stable/c/b0eb0a8959ac2b808eb11548d002fe1f9b5650cc","https://git.kernel.org/stable/c/9a738cf170a4a2332ea3a15e23ec65b5757fe4a1","https://git.kernel.org/stable/c/5d291ef0585ed880ed4dd71ea1a5965e0a65fb53"],"weaknesses":[],"ingestedAt":"2026-10-30T12:42:04.495Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/46xxx/CVE-2026-46032.json","commit":"db8103c5921aac81d5d90efcf3745980dafabf49","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46032","state":"PUBLISHED","datePublished":"2026-05-27T12:56:41.159Z","dateUpdated":"2026-10-30T12:25:57.350Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-13T15:03:33.093Z"},"containers":{"cna":{"title":"KVM: nSVM: Triple fault if restore host CR3 fails on nested #VMEXIT","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nSVM: Triple fault if restore host CR3 fails on nested #VMEXIT\n\nIf loading L1's CR3 fails on a nested #VMEXIT, nested_svm_vmexit()\nreturns an error code that is ignored by most callers, and continues to\nrun L1 with corrupted state. A sane recovery is not possible in this\ncase, and HW behavior is to cause a shutdown. Inject a triple fault\ninstead, and do not return early from nested_svm_vmexit(). Continue\ncleaning up the vCPU state (e.g. clear pending exceptions), to handle\nthe failure as gracefully as possible.\n\nFrom the APM:\n\n  Upon #VMEXIT, the processor performs the following actions in order to\n  return to the host execution context:\n\n  ...\n\n  if (illegal host state loaded, or exception while loading host state)\n      shutdown\n  else\n      execute first host instruction following the VMRUN\n\nRemove the return value of nested_svm_vmexit(), which is mostly\nunchecked anyway."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d82aaef9c88aa27bce63751d6d6329920b1fe8da","status":"affected","lessThan":"e6318570a9b4e137b0b744832b920b38bb069561","versionType":"git"},{"version":"d82aaef9c88aa27bce63751d6d6329920b1fe8da","status":"affected","lessThan":"2e661773890e6ba6b16064fad961da3dd311be43","versionType":"git"},{"version":"d82aaef9c88aa27bce63751d6d6329920b1fe8da","status":"affected","lessThan":"af79992ecdb6817970d757fb5d853b8d9b55a0d6","versionType":"git"},{"version":"d82aaef9c88aa27bce63751d6d6329920b1fe8da","status":"affected","lessThan":"b0eb0a8959ac2b808eb11548d002fe1f9b5650cc","versionType":"git"},{"version":"d82aaef9c88aa27bce63751d6d6329920b1fe8da","status":"affected","lessThan":"9a738cf170a4a2332ea3a15e23ec65b5757fe4a1","versionType":"git"},{"version":"d82aaef9c88aa27bce63751d6d6329920b1fe8da","status":"affected","lessThan":"5d291ef0585ed880ed4dd71ea1a5965e0a65fb53","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","arch/x86/kvm/svm/svm.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.9","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.9","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":"6.18.57","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","arch/x86/kvm/svm/svm.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/e6318570a9b4e137b0b744832b920b38bb069561"},{"url":"https://git.kernel.org/stable/c/2e661773890e6ba6b16064fad961da3dd311be43"},{"url":"https://git.kernel.org/stable/c/af79992ecdb6817970d757fb5d853b8d9b55a0d6"},{"url":"https://git.kernel.org/stable/c/b0eb0a8959ac2b808eb11548d002fe1f9b5650cc"},{"url":"https://git.kernel.org/stable/c/9a738cf170a4a2332ea3a15e23ec65b5757fe4a1"},{"url":"https://git.kernel.org/stable/c/5d291ef0585ed880ed4dd71ea1a5965e0a65fb53"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:25:57.350Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"6.18.57"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"7.0.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.9","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}