CVE-2026-64287

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While this is generally the case, flush_hyp_vcpu()\ncopies vgic_v3 verbatim and does not enforce this, so a value provided\nby the host is used at EL2 to index vgic_lr[] and access ICH_LR<n>_EL2\n(host -> EL2).\n\nFix by clamping used_lrs to the number of implemented list registers\nafter the copy, as the trusted path already does in\nvgic_flush_lr_state(). The number of implemented list registers is\nconstant after init, so it is replicated once from\nkvm_vgic_global_state.nr_lr into hyp_gicv3_nr_lr rather than read on\nevery entry."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H", "baseScore": 8.2, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - A malicious or compromised arm64 EL1 host reaches the flaw through the local KVM vCPU-run hypercall into pKVM EL2. No network or adjacent protocol directly controls this internal field.\nAC:L - On a pKVM/GICv3 system, the host can directly select an oversized used_lrs value and deterministically trigger the unchecked loops. No race or condition outside the attacker's control is required.\nPR:H - Normal KVM paths keep used_lrs hardware-bounded, and neither an unprivileged KVM user nor a user namespace can assign it directly. Exploitation requires control of the host kernel at EL1, equivalent to real administrative privileges.\nUI:N - The malicious host can load and run a vCPU itself without any action by a protected-VM user or another victim.\nS:C - Exploitation crosses pKVM's EL1-host-to-EL2 isolation boundary and can affect hypervisor-private state and protected VMs outside the host's security authority.\nC:H - The restore and synchronization paths can read beyond vgic_lr[] and transfer hyp-private vCPU data back into host-visible memory. EL2 compromise could expose protected-VM memory and other hypervisor secrets.\nI:H - The save path writes beyond vgic_lr[] into adjacent hyp-private vCPU metadata, including pointer, lock, and list state. This memory corruption is plausibly usable for EL2 control-flow hijacking and protected-VM modification.\nA:H - Large bounds can cause extensive loops, invalid EL2 memory accesses, or corruption of critical hypervisor metadata. An nVHE hypervisor panic explicitly escalates to a host kernel panic."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/arm64/include/asm/kvm_hyp.h", "arch/arm64/kvm/arm.c", "arch/arm64/kvm/hyp/nvhe/hyp-main.c"], "versions": [{"version": "be66e67f175096f283c9d5614c4991fc9e7ed975", "lessThan": "2c5e72b9fbf83fdfa724e9f1af0f418ccf8739b8", "status": "affected", "versionType": "git"}, {"version": "be66e67f175096f283c9d5614c4991fc9e7ed975", "lessThan": "9fa301d8298778dd799fa4dcf7a7f440715d146e", "status": "affected", "versionType": "git"}, {"version": "be66e67f175096f283c9d5614c4991fc9e7ed975", "lessThan": "c646431865f4b1a5b14067233fa27b11e05e0d46", "status": "affected", "versionType": "git"}, {"version": "be66e67f175096f283c9d5614c4991fc9e7ed975", "lessThan": "7fca3fcef81c713bc82a37bf741e0f28e6d04a6f", "status": "affected", "versionType": "git"}, {"version": "be66e67f175096f283c9d5614c4991fc9e7ed975", "lessThan": "8cc8bbbfab14c22c5551d0dd19b208a44b141c76", "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/arm64/include/asm/kvm_hyp.h", "arch/arm64/kvm/arm.c", "arch/arm64/kvm/hyp/nvhe/hyp-main.c"], "versions": [{"version": "6.2", "status": "affected"}, {"version": "0", "lessThan": "6.2", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.4", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "6.2", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.1.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2c5e72b9fbf83fdfa724e9f1af0f418ccf8739b8"}, {"url": "https://git.kernel.org/stable/c/9fa301d8298778dd799fa4dcf7a7f440715d146e"}, {"url": "https://git.kernel.org/stable/c/c646431865f4b1a5b14067233fa27b11e05e0d46"}, {"url": "https://git.kernel.org/stable/c/7fca3fcef81c713bc82a37bf741e0f28e6d04a6f"}, {"url": "https://git.kernel.org/stable/c/8cc8bbbfab14c22c5551d0dd19b208a44b141c76"}], "title": "KVM: arm64: Bound used_lrs when flushing the pKVM hyp vCPU", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64287", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:38:27.178822Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-125", "description": "CWE-125 Out-of-bounds Read"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:38:22.088Z"}}]}}

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No network or adjacent protocol directly controls this internal field.\nAC:L - On a pKVM/GICv3 system, the host can directly select an oversized used_lrs value and deterministically trigger the unchecked loops. No race or condition outside the attacker's control is required.\nPR:H - Normal KVM paths keep used_lrs hardware-bounded, and neither an unprivileged KVM user nor a user namespace can assign it directly. Exploitation requires control of the host kernel at EL1, equivalent to real administrative privileges.\nUI:N - The malicious host can load and run a vCPU itself without any action by a protected-VM user or another victim.\nS:C - Exploitation crosses pKVM's EL1-host-to-EL2 isolation boundary and can affect hypervisor-private state and protected VMs outside the host's security authority.\nC:H - The restore and synchronization paths can read beyond vgic_lr[] and transfer hyp-private vCPU data back into host-visible memory. EL2 compromise could expose protected-VM memory and other hypervisor secrets.\nI:H - The save path writes beyond vgic_lr[] into adjacent hyp-private vCPU metadata, including pointer, lock, and list state. This memory corruption is plausibly usable for EL2 control-flow hijacking and protected-VM modification.\nA:H - Large bounds can cause extensive loops, invalid EL2 memory accesses, or corruption of critical hypervisor metadata. 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The vGIC list register save and restore use used_lrs as\ntheir loop bound and expect it to stay within the number of implemented\nlist registers. While this is generally the case, flush_hyp_vcpu()\ncopies vgic_v3 verbatim and does not enforce this, so a value provided\nby the host is used at EL2 to index vgic_lr[] and access ICH_LR<n>_EL2\n(host -> EL2).\n\nFix by clamping used_lrs to the number of implemented list registers\nafter the copy, as the trusted path already does in\nvgic_flush_lr_state(). The number of implemented list registers is\nconstant after init, so it is replicated once from\nkvm_vgic_global_state.nr_lr into hyp_gicv3_nr_lr rather than read on\nevery entry."}], "id": "CVE-2026-64287", "lastModified": "2026-10-19T21:17:29.827", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.5, "impactScore": 6.0, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64287", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:38:27.178822Z", "version": "2.0.3"}}]}, "published": "2026-07-25T10:17:09.353", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2c5e72b9fbf83fdfa724e9f1af0f418ccf8739b8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7fca3fcef81c713bc82a37bf741e0f28e6d04a6f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8cc8bbbfab14c22c5551d0dd19b208a44b141c76"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9fa301d8298778dd799fa4dcf7a7f440715d146e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c646431865f4b1a5b14067233fa27b11e05e0d46"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-125"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: KVM: arm64: Bound used_lrs when flushing the pKVM hyp vCPU", "id": "2507129", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507129"}, "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-125", "details": ["A flaw was found in the Kernel-based Virtual Machine (KVM) component of the Linux kernel on ARM64 systems. A highly privileged local attacker could exploit a vulnerability where the system fails to properly restrict memory access during a specific virtual machine operation. This could allow the attacker to read or write to sensitive memory areas, potentially leading to privilege escalation, where they gain unauthorized higher access, or cause a system crash (denial of service)."], "name": "CVE-2026-64287", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "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": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64287\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64287\nhttps://lore.kernel.org/linux-cve-announce/2026072503-CVE-2026-64287-ea42@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[be66e67f175096f283c9d5614c4991fc9e7ed975,2c5e72b9fbf83fdfa724e9f1af0f418ccf8739b8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[be66e67f175096f283c9d5614c4991fc9e7ed975,9fa301d8298778dd799fa4dcf7a7f440715d146e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[be66e67f175096f283c9d5614c4991fc9e7ed975,c646431865f4b1a5b14067233fa27b11e05e0d46)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[be66e67f175096f283c9d5614c4991fc9e7ed975,7fca3fcef81c713bc82a37bf741e0f28e6d04a6f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[be66e67f175096f283c9d5614c4991fc9e7ed975,8cc8bbbfab14c22c5551d0dd19b208a44b141c76)"}}], "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": "[6.6.145,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.4,*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-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": "2026-07-25T13:15:03.775019+00:00", "updated": "2026-08-13T18:00:04.130468+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}