CVE-2026-80665

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80665", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.781Z", "datePublished": "2026-08-28T06:49:08.085Z", "dateUpdated": "2026-08-29T06:21:53.024Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-29T06:21:53.024Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: nv: Inject SEA if kvm_translate_vncr() can't resolve PFN\n\nkvm_handle_vncr_abort() assumes that s1_walk_result conveys an abort\nwhen kvm_translate_vncr() returns -EFAULT. This is not always the case\nas it's possible to encounter 'late' failures on the output of S1\ntranslation, e.g. a GFN outside of the memslots.\n\nFix it by preparing an external abort before returning from\nkvm_translate_vncr(). Get rid of the BUG_ON() in the fault injection\npath while at it."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached only when an arm64 nested-KVM L1 hypervisor triggers VNCR_EL2 data aborts (ESR_ELx_EC_DABT_CUR with ESR_ELx_VNCR) during KVM_RUN via kvm_handle_vncr_abort(); no network, adjacent-radio, or physical-device path reaches this code.\nAC:L - An attacker controlling an L1 nested-hypervisor VM can reliably set VNCR_EL2 and guest EL2 page tables so stage-1 translation succeeds but the resulting GFN is outside host memslots or PFN resolution fails, deterministically hitting the faulty -EFAULT path; nested virt on arm64 cloud hosts is an attacker-selectable deployment.\nPR:N - Exploitation requires no host root or init-namespace capabilities beyond running hypervisor code in a tenant KVM guest on an arm64 host with nested virtualization enabled; the attacker operates entirely from within their assigned VM, consistent with other arm64 KVM nested-virt CVE scoring.\nUI:N - No victim user or administrator action is required beyond the attacker operating their own nested-virtualization workload; VNCR faults, page-table configuration, and repeated translation triggers are fully attacker-driven from within the guest.\nS:C - A malicious nested guest forces host KVM into BUG_ON(!vt->wr.failed) during VNCR abort handling, crashing the physical host kernel and denying service to all co-resident VMs, crossing the guest-to-hypervisor security boundary beyond the guest's intended authority.\nC:N - The vulnerability triggers a host kernel BUG_ON panic on a late translation failure without setting s1_walk_result.failed; there is no out-of-bounds read, use-after-free, or other information-disclosure primitive\u2014only an incorrect assumption leading to host crash.\nI:N - Impact is limited to host kernel panic via BUG_ON on the fault-injection path; no guest or host data is modified, no arbitrary write primitive exists, and the fix only prepares an external abort for reinjection to the nested guest.\nA:H - BUG_ON(!vt->wr.failed) on the late -EFAULT path causes an uncontained host kernel panic on production kernels (CONFIG_BUG=y), crashing the hypervisor and denying availability to every workload on the affected physical machine; the attacker can retrigger after reboot."}]}], "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_nested.h", "arch/arm64/kvm/at.c", "arch/arm64/kvm/nested.c"], "versions": [{"version": "2a359e072596fcb2e9e85017a865e3618a2fe5b5", "lessThan": "4ead4def04659739c399bfcb063f8a906194c79f", "status": "affected", "versionType": "git"}, {"version": "2a359e072596fcb2e9e85017a865e3618a2fe5b5", "lessThan": "53804b6839573c9c6fff5f4cf075d6746267345e", "status": "affected", "versionType": "git"}, {"version": "2a359e072596fcb2e9e85017a865e3618a2fe5b5", "lessThan": "9f3e83345a56280efffe235c65593c7e544c0fcc", "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_nested.h", "arch/arm64/kvm/at.c", "arch/arm64/kvm/nested.c"], "versions": [{"version": "6.16", "status": "affected"}, {"version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "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": "6.16", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/4ead4def04659739c399bfcb063f8a906194c79f"}, {"url": "https://git.kernel.org/stable/c/53804b6839573c9c6fff5f4cf075d6746267345e"}, {"url": "https://git.kernel.org/stable/c/9f3e83345a56280efffe235c65593c7e544c0fcc"}], "title": "KVM: arm64: nv: Inject SEA if kvm_translate_vncr() can't resolve PFN", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["arch/arm64/include/asm/kvm_nested.h", "arch/arm64/kvm/at.c", "arch/arm64/kvm/nested.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "4ead4def04659739c399bfcb063f8a906194c79f", "status": "affected", "version": "2a359e072596fcb2e9e85017a865e3618a2fe5b5", "versionType": "git"}, {"lessThan": "53804b6839573c9c6fff5f4cf075d6746267345e", "status": "affected", "version": "2a359e072596fcb2e9e85017a865e3618a2fe5b5", "versionType": "git"}, {"lessThan": "9f3e83345a56280efffe235c65593c7e544c0fcc", "status": "affected", "version": "2a359e072596fcb2e9e85017a865e3618a2fe5b5", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["arch/arm64/include/asm/kvm_nested.h", "arch/arm64/kvm/at.c", "arch/arm64/kvm/nested.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.16"}, {"lessThan": "6.16", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: nv: Inject SEA if kvm_translate_vncr() can't resolve PFN\n\nkvm_handle_vncr_abort() assumes that s1_walk_result conveys an abort\nwhen kvm_translate_vncr() returns -EFAULT. This is not always the case\nas it's possible to encounter 'late' failures on the output of S1\ntranslation, e.g. a GFN outside of the memslots.\n\nFix it by preparing an external abort before returning from\nkvm_translate_vncr(). Get rid of the BUG_ON() in the fault injection\npath while at it."}], "id": "CVE-2026-80665", "lastModified": "2026-08-29T07:16:49.080", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 4.0, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-28T08:16:51.747", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4ead4def04659739c399bfcb063f8a906194c79f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/53804b6839573c9c6fff5f4cf075d6746267345e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9f3e83345a56280efffe235c65593c7e544c0fcc"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: KVM: arm64: nv: Inject SEA if kvm_translate_vncr() can't resolve PFN", "id": "2525423", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525423"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-253", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nKVM: arm64: nv: Inject SEA if kvm_translate_vncr() can't resolve PFN\nkvm_handle_vncr_abort() assumes that s1_walk_result conveys an abort\nwhen kvm_translate_vncr() returns -EFAULT. This is not always the case\nas it's possible to encounter 'late' failures on the output of S1\ntranslation, e.g. a GFN outside of the memslots.\nFix it by preparing an external abort before returning from\nkvm_translate_vncr(). Get rid of the BUG_ON() in the fault injection\npath while at it.", "A flaw was found in the Linux kernel's Kernel-based Virtual Machine (KVM) component for ARM64 architectures. The `kvm_handle_vncr_abort()` function incorrectly assumes that a specific translation result always indicates an abort, even when `kvm_translate_vncr()` returns an error for a Guest Frame Number (GFN) outside of allocated memory. This misinterpretation can lead to system instability or a denial of service (DoS) within the virtualized environment."], "name": "CVE-2026-80665", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80665\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80665\nhttps://lore.kernel.org/linux-cve-announce/2026082847-CVE-2026-80665-615f@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2a359e072596fcb2e9e85017a865e3618a2fe5b5,4ead4def04659739c399bfcb063f8a906194c79f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2a359e072596fcb2e9e85017a865e3618a2fe5b5,53804b6839573c9c6fff5f4cf075d6746267345e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2a359e072596fcb2e9e85017a865e3618a2fe5b5,9f3e83345a56280efffe235c65593c7e544c0fcc)"}}], "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": "6.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "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": "2026-08-28T12:00:10.414937+00:00", "updated": "2026-09-02T05:30:08.137091+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}