CVE-2025-37849

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Note only does this leak the corresponding\nmemory when the vCPU is destroyed but it can also lead to use-after-free\nif the redistributor device handling tries to walk into the vCPU.\n\nAdd the missing cleanup to kvm_arch_vcpu_create(), ensuring that the\nvGIC vCPU structures are destroyed on error."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerability is reached through the KVM_CREATE_VCPU ioctl on a VM file descriptor obtained from /dev/kvm, requiring local system access. No network or physical vector is involved.\nAC:L - The attacker controls every precondition: setting the GICv3 redistributor base to force iodev registration, and driving kvm_share_hyp() to -ENOMEM via memory pressure or hyp-pool exhaustion through repeated VM creation on nVHE/pKVM hosts, then replaying the create attempt in a loop until it fails.\nPR:L - Only an open fd to /dev/kvm is needed, which unprivileged local users routinely hold (0666 on several distros, kvm-group membership elsewhere, and standard in nested-virt/cloud and Android AVF deployments); no capability check guards KVM_CREATE_VCPU.\nUI:N - The attacker performs the entire sequence \u2014 create VM, set the redistributor address, force the failing vCPU creation, then run a vCPU or destroy the VM to touch the stale iodev \u2014 with no action from any other user.\nS:C - The stale redistributor iodev leaves a guest-reachable MMIO handler pointing into freed host kernel memory, so a confined guest's ordinary access to the redistributor region drives indirect calls through freed host-kernel data, crossing the guest/host security boundary; this also matches scoring of comparable KVM arm64 vGIC use-after-free issues.\nC:H - The use-after-free lets the attacker reclaim the freed kvm_vcpu slab object and have dispatch_mmio_read() return attacker-influenced host kernel memory contents to the guest via the redistributor MMIO read path, yielding arbitrary kernel memory disclosure.\nI:H - kvm_iodevice_write()/kvm_iodevice_destructor() dereference dev->ops from the freed object and dispatch_mmio_write() makes a second indirect call through region->write, so heap grooming of the freed kvm_vcpu object gives control-flow hijack and arbitrary write in the host kernel.\nA:H - Even without successful grooming, dereferencing the dangling kvm_io_device on guest MMIO or during kvm_io_bus_destroy() at VM teardown oopses the host kernel, and each failed vCPU creation additionally leaks the private_irqs allocation."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/arm64/kvm/arm.c"], "versions": [{"version": "6211753fdfd05af9e08f54c8d0ba3ee516034878", "lessThan": "07476e0d932afc53c05468076393ac35d0b4999e", "status": "affected", "versionType": "git"}, {"version": "6211753fdfd05af9e08f54c8d0ba3ee516034878", "lessThan": "5085e02362b9948f82fceca979b8f8e12acb1cc5", "status": "affected", "versionType": "git"}, {"version": "6211753fdfd05af9e08f54c8d0ba3ee516034878", "lessThan": "c322789613407647a05ff5c451a7bf545fb34e73", "status": "affected", "versionType": "git"}, {"version": "6211753fdfd05af9e08f54c8d0ba3ee516034878", "lessThan": "2480326eba8ae9ccc5e4c3c2dc8d407db68e3c52", "status": "affected", "versionType": "git"}, {"version": "6211753fdfd05af9e08f54c8d0ba3ee516034878", "lessThan": "f1e9087abaeedec9bf2894a282ee4f0d8383f299", "status": "affected", "versionType": "git"}, {"version": "6211753fdfd05af9e08f54c8d0ba3ee516034878", "lessThan": "250f25367b58d8c65a1b060a2dda037eea09a672", "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/kvm/arm.c"], "versions": [{"version": "3.11", "status": "affected"}, {"version": "0", "lessThan": "3.11", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.135", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.88", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.24", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13.12", "lessThanOrEqual": "6.13.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.14.3", "lessThanOrEqual": "6.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.15", "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": "3.11", "versionEndExcluding": "6.1.135"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.6.88"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.12.24"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.13.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.14.3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.11", "versionEndExcluding": "6.15"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/07476e0d932afc53c05468076393ac35d0b4999e"}, {"url": "https://git.kernel.org/stable/c/5085e02362b9948f82fceca979b8f8e12acb1cc5"}, {"url": "https://git.kernel.org/stable/c/c322789613407647a05ff5c451a7bf545fb34e73"}, {"url": "https://git.kernel.org/stable/c/2480326eba8ae9ccc5e4c3c2dc8d407db68e3c52"}, {"url": "https://git.kernel.org/stable/c/f1e9087abaeedec9bf2894a282ee4f0d8383f299"}, {"url": "https://git.kernel.org/stable/c/250f25367b58d8c65a1b060a2dda037eea09a672"}], "title": "KVM: arm64: Tear down vGIC on failed vCPU creation", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:56:22.007Z"}}]}}

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Note only does this leak the corresponding\nmemory when the vCPU is destroyed but it can also lead to use-after-free\nif the redistributor device handling tries to walk into the vCPU.\n\nAdd the missing cleanup to kvm_arch_vcpu_create(), ensuring that the\nvGIC vCPU structures are destroyed on error."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: arm64: Desactivaci\u00f3n de vGIC al crear una vCPU fallida. Si kvm_arch_vcpu_create() no comparte la p\u00e1gina de vCPU con el hipervisor, propagamos el error a ioctl, pero dejamos los datos de vCPU de vGIC inicializados. Cabe destacar que esto solo filtra la memoria correspondiente cuando se destruye la vCPU, sino que tambi\u00e9n puede provocar un uso despu\u00e9s de la liberaci\u00f3n si el dispositivo redistribuidor intenta acceder a la vCPU. Agregue la limpieza faltante a kvm_arch_vcpu_create() para garantizar que las estructuras de vCPU de vGIC se destruyan en caso de error."}], "id": "CVE-2025-37849", "lastModified": "2026-07-30T06:22:23.650", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 6.0, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-05-09T07:16:05.760", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/07476e0d932afc53c05468076393ac35d0b4999e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2480326eba8ae9ccc5e4c3c2dc8d407db68e3c52"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/250f25367b58d8c65a1b060a2dda037eea09a672"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5085e02362b9948f82fceca979b8f8e12acb1cc5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c322789613407647a05ff5c451a7bf545fb34e73"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f1e9087abaeedec9bf2894a282ee4f0d8383f299"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List"], "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: KVM: arm64: Tear down vGIC on failed vCPU creation", "id": "2365271", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2365271"}, "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"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nKVM: arm64: Tear down vGIC on failed vCPU creation\nIf kvm_arch_vcpu_create() fails to share the vCPU page with the\nhypervisor, we propagate the error back to the ioctl but leave the\nvGIC vCPU data initialised. Note only does this leak the corresponding\nmemory when the vCPU is destroyed but it can also lead to use-after-free\nif the redistributor device handling tries to walk into the vCPU.\nAdd the missing cleanup to kvm_arch_vcpu_create(), ensuring that the\nvGIC vCPU structures are destroyed on error."], "name": "CVE-2025-37849", "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": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-05-09T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-37849\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-37849\nhttps://lore.kernel.org/linux-cve-announce/2025050918-CVE-2025-37849-2a30@gregkh/T"], "threat_severity": "Moderate"}

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