CVE-2026-46147

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-46147", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.101Z", "datePublished": "2026-05-28T09:36:03.892Z", "dateUpdated": "2026-06-14T17:58:03.230Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-06-14T17:58:03.230Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Fix pin leak and publication ordering in __pkvm_init_vcpu()\n\nTwo bugs exist in the vCPU initialisation path:\n\n1. If a check fails after hyp_pin_shared_mem() succeeds, the cleanup\n path jumps to 'unlock' without calling unpin_host_vcpu() or\n unpin_host_sve_state(), permanently leaking pin references on the\n host vCPU and SVE state pages.\n\n Extract a register_hyp_vcpu() helper that performs the checks and\n the store. When register_hyp_vcpu() returns an error, call\n unpin_host_vcpu() and unpin_host_sve_state() inline before falling\n through to the existing 'unlock' label.\n\n2. register_hyp_vcpu() publishes the new vCPU pointer into\n 'hyp_vm->vcpus[]' with a bare store, allowing a concurrent caller\n of pkvm_load_hyp_vcpu() to observe a partially initialised vCPU\n object.\n\n Ensure the store uses smp_store_release() and the load uses\n smp_load_acquire(). While 'vm_table_lock' currently serialises the\n store and the load, these barriers ensure the reader sees the fully\n initialised 'hyp_vcpu' object even if there were a lockless path or\n if the lock's own ordering guarantees were insufficient for nested\n object initialization."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/arm64/kvm/hyp/nvhe/pkvm.c"], "versions": [{"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "7d3c27b54253cda91dc4d2c1bfc109c490837ab9", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "6d69c0ed978f7f0efd053fc98390f25ab77c1aea", "status": "affected", "versionType": "git"}, {"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": "73b9c1e5da84cd69b1a86e374e450817cd051371", "status": "affected", "versionType": "git"}, {"version": "0", "lessThan": "6.18.30", "status": "affected", "versionType": "semver"}, {"version": "0", "lessThan": "7.0.7", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/arm64/kvm/hyp/nvhe/pkvm.c"], "versions": [{"version": "6.18.30", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.7", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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:*:*:*:*:*:*:*:*", "versionEndExcluding": "6.18.30"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "7.0.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/7d3c27b54253cda91dc4d2c1bfc109c490837ab9"}, {"url": "https://git.kernel.org/stable/c/6d69c0ed978f7f0efd053fc98390f25ab77c1aea"}, {"url": "https://git.kernel.org/stable/c/73b9c1e5da84cd69b1a86e374e450817cd051371"}], "title": "KVM: arm64: Fix pin leak and publication ordering in __pkvm_init_vcpu()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["arch/arm64/kvm/hyp/nvhe/pkvm.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "7d3c27b54253cda91dc4d2c1bfc109c490837ab9", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "6d69c0ed978f7f0efd053fc98390f25ab77c1aea", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "73b9c1e5da84cd69b1a86e374e450817cd051371", "status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "versionType": "git"}, {"lessThan": "6.18.30", "status": "affected", "version": "0", "versionType": "semver"}, {"lessThan": "7.0.7", "status": "affected", "version": "0", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["arch/arm64/kvm/hyp/nvhe/pkvm.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.30", "versionType": "semver"}, {"lessThanOrEqual": "7.0.*", "status": "unaffected", "version": "7.0.7", "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": "B2F7049B-B157-4797-BBC1-82A75717CDEC", "versionEndExcluding": "6.18.30", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D0893CA7-9AE6-4DFE-AC75-48967D73AD8E", "versionEndExcluding": "7.0.7", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*", "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Fix pin leak and publication ordering in __pkvm_init_vcpu()\n\nTwo bugs exist in the vCPU initialisation path:\n\n1. If a check fails after hyp_pin_shared_mem() succeeds, the cleanup\n path jumps to 'unlock' without calling unpin_host_vcpu() or\n unpin_host_sve_state(), permanently leaking pin references on the\n host vCPU and SVE state pages.\n\n Extract a register_hyp_vcpu() helper that performs the checks and\n the store. When register_hyp_vcpu() returns an error, call\n unpin_host_vcpu() and unpin_host_sve_state() inline before falling\n through to the existing 'unlock' label.\n\n2. register_hyp_vcpu() publishes the new vCPU pointer into\n 'hyp_vm->vcpus[]' with a bare store, allowing a concurrent caller\n of pkvm_load_hyp_vcpu() to observe a partially initialised vCPU\n object.\n\n Ensure the store uses smp_store_release() and the load uses\n smp_load_acquire(). While 'vm_table_lock' currently serialises the\n store and the load, these barriers ensure the reader sees the fully\n initialised 'hyp_vcpu' object even if there were a lockless path or\n if the lock's own ordering guarantees were insufficient for nested\n object initialization."}], "id": "CVE-2026-46147", "lastModified": "2026-06-17T10:53:08.980", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-05-28T10:16:30.320", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6d69c0ed978f7f0efd053fc98390f25ab77c1aea"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/73b9c1e5da84cd69b1a86e374e450817cd051371"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7d3c27b54253cda91dc4d2c1bfc109c490837ab9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: KVM: arm64: Fix pin leak and publication ordering in __pkvm_init_vcpu()", "id": "2482620", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482620"}, "csaw": false, "cwe": "CWE-772", "details": ["A flaw was found in the Linux kernel's Kernel-based Virtual Machine (KVM) for ARM64 architectures. During the vCPU initialization process, a pin leak can occur, leading to a permanent loss of references to host vCPU and SVE state pages. Additionally, a concurrent process might observe a partially initialized vCPU object due to improper publication ordering. These issues could lead to resource exhaustion and system instability, potentially resulting in a denial of service."], "name": "CVE-2026-46147", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not 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": "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": "2026-05-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-46147\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-46147\nhttps://lore.kernel.org/linux-cve-announce/2026052821-CVE-2026-46147-9b7f@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,7d3c27b54253cda91dc4d2c1bfc109c490837ab9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,6d69c0ed978f7f0efd053fc98390f25ab77c1aea)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[1da177e4c3f41524e886b7f1b8a0c1fc7321cac2,73b9c1e5da84cd69b1a86e374e450817cd051371)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.18.30)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,7.0.7)"}}], "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": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "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": "2026-05-28T11:45:16.112842+00:00", "updated": "2026-06-10T23:00:20.894876+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}