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Si no puede crear una instancia de un nuevo bus, unregister_dev() destruye todos los dispositivos _excepto_ el dispositivo de destino. Pero no le dice a la persona que llama que destruy\u00f3 el bus e invoc\u00f3 el destructor para todos los dispositivos que estaban en el bus. En el caso de MMIO fusionado, esto puede resultar en una desreferencia de entrada de lista eliminada debido al intento de continuar iterando en coalesced_zones despu\u00e9s de que se hayan eliminado entradas futuras (en el recorrido). De manera oportunista, agregue llaves al bucle for, que abarca muchas l\u00edneas pero se escapa sin llaves debido a que el valor es una sola declaraci\u00f3n if."}], "id": "CVE-2021-47060", "lastModified": "2025-04-08T15:01:31.187", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.0, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 0.8, "impactScore": 5.2, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2024-02-29T23:15:07.740", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/168e82f640ed1891a700bdb43e37da354b2ab63c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2a20592baff59c5351c5200ec667e1a2aa22af85"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/50cbad42bfea8c052b7ca590bd4126cdc898713c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5d3c4c79384af06e3c8e25b7770b6247496b4417"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7d1bc32d6477ff96a32695ea4be8144e4513ab2d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/168e82f640ed1891a700bdb43e37da354b2ab63c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2a20592baff59c5351c5200ec667e1a2aa22af85"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/50cbad42bfea8c052b7ca590bd4126cdc898713c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5d3c4c79384af06e3c8e25b7770b6247496b4417"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7d1bc32d6477ff96a32695ea4be8144e4513ab2d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: KVM: use-after-free while looking for coalesced MMIO zones if the bus is destroyed", "id": "2267175", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2267175"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nKVM: Stop looking for coalesced MMIO zones if the bus is destroyed\nAbort the walk of coalesced MMIO zones if kvm_io_bus_unregister_dev()\nfails to allocate memory for the new instance of the bus. If it can't\ninstantiate a new bus, unregister_dev() destroys all devices _except_ the\ntarget device. But, it doesn't tell the caller that it obliterated the\nbus and invoked the destructor for all devices that were on the bus. In\nthe coalesced MMIO case, this can result in a deleted list entry\ndereference due to attempting to continue iterating on coalesced_zones\nafter future entries (in the walk) have been deleted.\nOpportunistically add curly braces to the for-loop, which encompasses\nmany lines but sneaks by without braces due to the guts being a single\nif statement.", "A flaw was found in the Linux kernel\u2019s Kernel-based virtual machine (KVM) subsystem. The issue arises when looking for coalesced Memory-Mapped I/O (MMIO) zones if the bus is destroyed. The vulnerability is due to a failure in memory allocation for a new instance of the bus during the unregistration process. If the allocation fails, the system continues to walk through coalesced MMIO zones. This issue leads to a use-after-free scenario as the bus and devices are destroyed without notifying the caller."], "name": "CVE-2021-47060", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "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": "2024-02-29T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47060\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47060\nhttps://lore.kernel.org/linux-cve-announce/2024022952-CVE-2021-47060-d2ce@gregkh/T/#u"], "statement": "Red Hat Enterprise Linux 8 and 9 are not affected by this vulnerability.", "threat_severity": "Moderate"}