CVE-2026-46076

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The last remaining \"single\" stub will\nsoon be dropped as well.\n\n[sean: rewrite changelog and comment, tag for stable, remove defunct stubs]"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H", "baseScore": 7.9, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The path is reached by executing a VMMCALL instruction from within a nested (L2) guest running under KVM on AMD SVM; this is local execution against the hypervisor, not reachable via network, adjacent network, or physical interface.\nAC:L - Triggering is deterministic \u2014 once the nested setup exists (L1 does not intercept VMMCALL, e.g. relying on L0's Hyper-V direct L2 TLB-flush handling), a single VMMCALL in L2 reliably reaches L0's hypercall handler with no race or attacker-uncontrolled timing, mirroring sibling CVE-2026-43133.\nPR:L - The attacker must control a guest and run guest kernel-level (CPL0) code in the nested guest to set up and issue the hypercall; this is low privilege relative to the host and requires no real init-namespace root.\nUI:N - Exploitation is triggered solely by guest instruction execution (VMMCALL); no host-side or victim user action is required.\nS:C - The bug is in KVM's enforcement of the nested-virtualization boundary: L2's VMMCALL is serviced by L0 as if it were L1 instead of #UD'ing, so an L2 guest's action reaches and affects L1/L0-maintained state outside the L2 guest's own security authority.\nC:L - The improperly-handled hypercalls cause L0 to read L1-context memory (guest-physical addresses supplied by L2 are interpreted in the L1/host-maintained address space) and inspect the vCPU's Hyper-V state \u2014 a bounded cross-domain exposure, not an arbitrary host read primitive.\nI:L - L2 can drive L0 hypercalls that modify L1/host-maintained state (inject IPIs into the VM's vCPUs, post SynIC messages/signal events, request GPA-range operations), a bounded cross-domain state modification rather than an arbitrary write or code-execution primitive.\nA:H - L2 can repeatedly issue these hypercalls to force TLB flushes, inject IPIs, and corrupt the L1 hypervisor's Hyper-V messaging state, destabilizing or hanging the affected nested-virtualization workload at will \u2014 a complete loss of availability for that workload."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/x86/kvm/hyperv.h", "arch/x86/kvm/svm/hyperv.h", "arch/x86/kvm/svm/nested.c", "arch/x86/kvm/svm/svm.c"], "versions": [{"version": "3f4a812edf5cb0a50e65fbdfafdb3e688da18f16", "lessThan": "fcef67506c0234935cb0fb026740a637edb58d7c", "status": "affected", "versionType": "git"}, {"version": "3f4a812edf5cb0a50e65fbdfafdb3e688da18f16", "lessThan": "924d721fae95687acedbaf624a094ed0e8b67104", "status": "affected", "versionType": "git"}, {"version": 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Triggering is deterministic \u2014 once the nested setup exists (L1 does not intercept VMMCALL, e.g. relying on L0's Hyper-V direct L2 TLB-flush handling), a single VMMCALL in L2 reliably reaches L0's hypercall handler with no race or attacker-uncontrolled timing, mirroring sibling CVE-2026-43133.\nPR:L - The attacker must control a guest and run guest kernel-level (CPL0) code in the nested guest to set up and issue the hypercall; this is low privilege relative to the host and requires no real init-namespace root.\nUI:N - Exploitation is triggered solely by guest instruction execution (VMMCALL); no host-side or victim user action is required.\nS:C - The bug is in KVM's enforcement of the nested-virtualization boundary: L2's VMMCALL is serviced by L0 as if it were L1 instead of #UD'ing, so an L2 guest's action reaches and affects L1/L0-maintained state outside the L2 guest's own security authority.\nC:L - The improperly-handled hypercalls cause L0 to read L1-context memory (guest-physical addresses supplied by L2 are interpreted in the L1/host-maintained address space) and inspect the vCPU's Hyper-V state \u2014 a bounded cross-domain exposure, not an arbitrary host read primitive.\nI:L - 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["arch/x86/kvm/hyperv.h", "arch/x86/kvm/svm/hyperv.h", "arch/x86/kvm/svm/nested.c", "arch/x86/kvm/svm/svm.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "fcef67506c0234935cb0fb026740a637edb58d7c", "status": "affected", "version": "3f4a812edf5cb0a50e65fbdfafdb3e688da18f16", "versionType": "git"}, {"lessThan": "924d721fae95687acedbaf624a094ed0e8b67104", "status": "affected", "version": "3f4a812edf5cb0a50e65fbdfafdb3e688da18f16", "versionType": "git"}, {"lessThan": "009c0f726abeaa67aad1d96b883bdce01d405ce2", "status": "affected", "version": "3f4a812edf5cb0a50e65fbdfafdb3e688da18f16", "versionType": "git"}, {"lessThan": "5fb4a5f361565f5b629d8a8fe5288ce8463c5727", "status": "affected", "version": "3f4a812edf5cb0a50e65fbdfafdb3e688da18f16", "versionType": "git"}, {"lessThan": "c36991c6f8d2ab56ee67aff04e3c357f45cfc76c", "status": "affected", "version": "3f4a812edf5cb0a50e65fbdfafdb3e688da18f16", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["arch/x86/kvm/hyperv.h", "arch/x86/kvm/svm/hyperv.h", "arch/x86/kvm/svm/nested.c", "arch/x86/kvm/svm/svm.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.2"}, {"lessThan": "6.2", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.86", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.27", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "B33E0975-006A-45BB-AD35-19D8D80F6676", "versionEndExcluding": "6.12.86", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "A10AC84F-C058-47D5-85B4-E6E51A613B74", "versionEndExcluding": "6.18.27", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "CDB78D6D-22C3-4154-B0D0-94AF1CE5C2E3", "versionEndExcluding": "7.0.4", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1\n\nExplicitly synthesize a #UD for VMMCALL if L2 is active, L1 does NOT want\nto intercept VMMCALL, nested_svm_l2_tlb_flush_enabled() is true, and the\nhypercall is something other than one of the supported Hyper-V hypercalls.\nWhen all of the above conditions are met, KVM will intercept VMMCALL but\nnever forward it to L1, i.e. will let L2 make hypercalls as if it were L1.\n\nThe TLFS says a whole lot of nothing about this scenario, so go with the\narchitectural behavior, which says that VMMCALL #UDs if it's not\nintercepted.\n\nOpportunistically do a 2-for-1 stub trade by stub-ifying the new API\ninstead of the helpers it uses. The last remaining \"single\" stub will\nsoon be dropped as well.\n\n[sean: rewrite changelog and comment, tag for stable, remove defunct stubs]"}], "id": "CVE-2026-46076", "lastModified": "2026-10-21T13:19:03.427", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.9, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 5.3, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-46076", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:19:27.445501Z", "version": "2.0.3"}}]}, "published": "2026-05-27T14:17:28.930", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/009c0f726abeaa67aad1d96b883bdce01d405ce2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5fb4a5f361565f5b629d8a8fe5288ce8463c5727"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/924d721fae95687acedbaf624a094ed0e8b67104"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c36991c6f8d2ab56ee67aff04e3c357f45cfc76c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fcef67506c0234935cb0fb026740a637edb58d7c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Undergoing Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-863"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: KVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1", "id": "2481992", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2481992"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-475", "details": ["A flaw was found in the Kernel-based Virtual Machine (KVM) nSVM module of the Linux kernel. This vulnerability occurs when an unhandled VMMCALL is not properly intercepted by the Level 1 (L1) hypervisor. A malicious Level 2 (L2) guest operating system could exploit this by making specific hypercalls, leading to an Undefined Opcode exception (#UD) in the host. This could potentially result in a denial of service for the host system."], "name": "CVE-2026-46076", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46076\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46076\nhttps://lore.kernel.org/linux-cve-announce/2026052759-CVE-2026-46076-699a@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3f4a812edf5cb0a50e65fbdfafdb3e688da18f16,924d721fae95687acedbaf624a094ed0e8b67104)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3f4a812edf5cb0a50e65fbdfafdb3e688da18f16,009c0f726abeaa67aad1d96b883bdce01d405ce2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3f4a812edf5cb0a50e65fbdfafdb3e688da18f16,5fb4a5f361565f5b629d8a8fe5288ce8463c5727)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3f4a812edf5cb0a50e65fbdfafdb3e688da18f16,c36991c6f8d2ab56ee67aff04e3c357f45cfc76c)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.2"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.2)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.86,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.27,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.4,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-27T20:15:16.211535+00:00", "updated": "2026-10-23T01:15:14.056308+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}