CVE-2022-49016

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So call\nfwnode_handle_put() in phy_device_release() to avoid leak.\n\nIf it's an acpi node, it has never been get, but it's put\nin the error path, so call fwnode_handle_get() before\nphy_device_register() to keep get/put operation balanced."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: mdiobus: arregla el recuento de referencias de nodos desequilibrados Obtuve el siguiente informe mientras realizaba la prueba de carga del dispositivo (mscc-miim) con CONFIG_OF_UNITTEST y CONFIG_OF_DYNAMIC habilitados: OF: ERROR: p\u00e9rdida de memoria, se esperaba un recuento de referencias 1 en lugar de 2, of_node_get()/of_node_put() desequilibrado - destruye la entrada cset: adjuntar un nodo superpuesto /spi/soc@0/mdio@7107009c/ethernet-phy@0 Si el 'fwnode' no es un nodo acpi, el recuento de referencias se obtiene en fwnode_mdiobus_phy_device_register(), pero nunca se ha colocado cuando el dispositivo se libera en la ruta normal. Entonces llama a fwnode_handle_put() en phy_device_release() para evitar la p\u00e9rdida. Si es un nodo acpi, nunca se ha obtenido, pero se coloca en la ruta de error, por lo que se llama a fwnode_handle_get() antes de phy_device_register() para mantener equilibrada la operaci\u00f3n de obtenci\u00f3n/colocaci\u00f3n."}], "id": "CVE-2022-49016", "lastModified": "2026-06-17T05:16:51.450", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-49016", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-10-22T13:13:13.450914Z", "version": "2.0.3"}}]}, "published": "2024-10-21T20:15:12.840", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2708b357440427d6a9fee667eb7b8307f4625adc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/543d917f691ab06885ee779c862065899eaa4251"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/cdde1560118f82498fc9e9a7c1ef7f0ef7755891"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: mdiobus: fix unbalanced node reference count", "id": "2320664", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2320664"}, "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-401", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: mdiobus: fix unbalanced node reference count\nI got the following report while doing device(mscc-miim) load test\nwith CONFIG_OF_UNITTEST and CONFIG_OF_DYNAMIC enabled:\nOF: ERROR: memory leak, expected refcount 1 instead of 2,\nof_node_get()/of_node_put() unbalanced - destroy cset entry:\nattach overlay node /spi/soc@0/mdio@7107009c/ethernet-phy@0\nIf the 'fwnode' is not an acpi node, the refcount is get in\nfwnode_mdiobus_phy_device_register(), but it has never been\nput when the device is freed in the normal path. So call\nfwnode_handle_put() in phy_device_release() to avoid leak.\nIf it's an acpi node, it has never been get, but it's put\nin the error path, so call fwnode_handle_get() before\nphy_device_register() to keep get/put operation balanced.", "A vulnerability was found in the Linux kernel's mdiobus subsystem, causing unbalanced reference counts for firmware nodes (fwnode), leading to memory leaks and potential instability. The issue occurred because fwnode_mdiobus_phy_device_register() incremented the reference count for non-ACPI nodes without a corresponding decrement during device release, while the ACPI nodes lacked proper reference balancing in error paths."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2022-49016", "package_state": [{"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": "2024-10-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49016\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49016\nhttps://lore.kernel.org/linux-cve-announce/2024102153-CVE-2022-49016-c7bb@gregkh/T"], "statement": "Red Hat Enterprise Linux is not vulnerable to this CVE, as it does not affect the versions or configurations of the Linux kernel used in its distributions.", "threat_severity": "Moderate"}

{}