CVE-2021-47416

{"id": "CVE-2021-47416", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "[email protected]", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2024-05-21T15:15:27.083", "references": [{"url": "https://git.kernel.org/stable/c/064c2616234a7394867c924b5c1303974f3a4f4d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/0d2dd40a7be61b89a7c99dae8ee96389d27b413a", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/2250392d930bd0d989f24d355d6355b0150256e7", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/2397b9e118721292429fea8807a698e71b94795f", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/25e9f88c7e3cc35f5e3d3db199660d28a15df639", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/414bb4ead1362ef2c8592db723c017258f213988", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ca6e11c337daf7925ff8a2aac8e84490a8691905", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/f4f502a04ee1e543825af78f47eb7785015cd9f6", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/064c2616234a7394867c924b5c1303974f3a4f4d", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/0d2dd40a7be61b89a7c99dae8ee96389d27b413a", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/2250392d930bd0d989f24d355d6355b0150256e7", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/2397b9e118721292429fea8807a698e71b94795f", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/25e9f88c7e3cc35f5e3d3db199660d28a15df639", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/414bb4ead1362ef2c8592db723c017258f213988", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/ca6e11c337daf7925ff8a2aac8e84490a8691905", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/f4f502a04ee1e543825af78f47eb7785015cd9f6", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "[email protected]", "description": [{"lang": "en", "value": "CWE-401"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nphy: mdio: fix memory leak\n\nSyzbot reported memory leak in MDIO bus interface, the problem was in\nwrong state logic.\n\nMDIOBUS_ALLOCATED indicates 2 states:\n\t1. Bus is only allocated\n\t2. Bus allocated and __mdiobus_register() fails, but\n\t device_register() was called\n\nIn case of device_register() has been called we should call put_device()\nto correctly free the memory allocated for this device, but mdiobus_free()\ncalls just kfree(dev) in case of MDIOBUS_ALLOCATED state\n\nTo avoid this behaviour we need to set bus->state to MDIOBUS_UNREGISTERED\n_before_ calling device_register(), because put_device() should be\ncalled even in case of device_register() failure."}, {"lang": "es", "value": " En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: phy: mdio: arreglar p\u00e9rdida de memoria. Syzbot inform\u00f3 una p\u00e9rdida de memoria en la interfaz del bus MDIO, el problema estaba en una l\u00f3gica de estado incorrecta. MDIOBUS_ALLOCATED indica 2 estados: 1. El bus solo est\u00e1 asignado 2. El bus asignado y __mdiobus_register() falla, pero se llam\u00f3 a device_register() En caso de que se haya llamado a device_register() debemos llamar a put_device() para liberar correctamente la memoria asignada para esto dispositivo, pero mdiobus_free() llama solo a kfree(dev) en caso de estado MDIOBUS_ALLOCATED. Para evitar este comportamiento, necesitamos configurar bus->state en MDIOBUS_UNREGISTERED _antes_ de llamar a device_register(), porque put_device() debe llamarse incluso en caso de fallo de device_register( ."}], "lastModified": "2024-12-31T18:53:18.000", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D95AA5F2-2A38-4D42-BCE3-11D4CDA29078", "versionEndExcluding": "4.4.289", "versionStartIncluding": "2.6.28"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7D94FCF9-86AA-4CB2-96FC-F5EEC5E24530", "versionEndExcluding": "4.9.287", "versionStartIncluding": "4.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E0CA000A-C041-41C7-BB29-59359F62F9AD", "versionEndExcluding": "4.14.251", "versionStartIncluding": "4.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "19F2BDAE-0E29-4C98-A02A-4DA148685995", "versionEndExcluding": "4.19.211", "versionStartIncluding": "4.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "99815E71-6131-41A5-B309-1917CBBDF09C", "versionEndExcluding": "5.4.153", "versionStartIncluding": "4.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "83DBC258-8513-4ECB-A55E-57E743405733", "versionEndExcluding": "5.10.73", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "20EB962C-32DC-448F-A900-BCF9A726F9EB", "versionEndExcluding": "5.14.12", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E46C74C6-B76B-4C94-A6A4-FD2FFF62D644"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "60134C3A-06E4-48C1-B04F-2903732A4E56"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0460DA88-8FE1-46A2-9DDA-1F1ABA552E71"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AF55383D-4DF2-45DC-93F7-571F4F978EAB"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}