{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2022-48815", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-07-16T11:38:08.900Z", "datePublished": "2024-07-16T11:44:03.971Z", "dateUpdated": "2025-05-04T08:23:49.891Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T08:23:49.891Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: dsa: bcm_sf2: don't use devres for mdiobus\n\nAs explained in commits:\n74b6d7d13307 (\"net: dsa: realtek: register the MDIO bus under devres\")\n5135e96a3dd2 (\"net: dsa: don't allocate the slave_mii_bus using devres\")\n\nmdiobus_free() will panic when called from devm_mdiobus_free() <-\ndevres_release_all() <- __device_release_driver(), and that mdiobus was\nnot previously unregistered.\n\nThe Starfighter 2 is a platform device, so the initial set of\nconstraints that I thought would cause this (I2C or SPI buses which call\n->remove on ->shutdown) do not apply. 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But there is one more which\napplies here.\n\nIf the DSA master itself is on a bus that calls ->remove from ->shutdown\n(like dpaa2-eth, which is on the fsl-mc bus), there is a device link\nbetween the switch and the DSA master, and device_links_unbind_consumers()\nwill unbind the bcm_sf2 switch driver on shutdown.\n\nSo the same treatment must be applied to all DSA switch drivers, which\nis: either use devres for both the mdiobus allocation and registration,\nor don't use devres at all.\n\nThe bcm_sf2 driver has the code structure in place for orderly mdiobus\nremoval, so just replace devm_mdiobus_alloc() with the non-devres\nvariant, and add manual free where necessary, to ensure that we don't\nlet devres free a still-registered bus."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: dsa: bcm_sf2: no use devres para mdiobus Como se explica en los commits: 74b6d7d13307 (\"net: dsa: realtek: registre el bus MDIO en devres\") 5135e96a3dd2 (\" net: dsa: no asigne el esclavo_mii_bus usando devres\") mdiobus_free() entrar\u00e1 en p\u00e1nico cuando se llame desde devm_mdiobus_free() &lt;- devres_release_all() &lt;- __device_release_driver(), y ese mdiobus no fue anulado previamente. El Starfighter 2 es un dispositivo de plataforma, por lo que el conjunto inicial de restricciones que pens\u00e9 que causar\u00edan esto (buses I2C o SPI que llaman -&gt;eliminar activado -&gt;apagar) no se aplican. Pero hay algo m\u00e1s que se aplica aqu\u00ed. Si el maestro DSA est\u00e1 en un bus que llama -&gt;remove from -&gt;shutdown (como dpaa2-eth, que est\u00e1 en el bus fsl-mc), hay un enlace de dispositivo entre el conmutador y el maestro DSA, y device_links_unbind_consumers( ) desvincular\u00e1 el controlador del conmutador bcm_sf2 al apagar. Por lo tanto, se debe aplicar el mismo tratamiento a todos los controladores de conmutador DSA, que es: usar devres tanto para la asignaci\u00f3n como para el registro de mdiobus, o no usar devres en absoluto. El controlador bcm_sf2 tiene la estructura de c\u00f3digo implementada para la eliminaci\u00f3n ordenada de mdiobus, as\u00ed que simplemente reemplace devm_mdiobus_alloc() con la variante que no es devres y agregue manual free cuando sea necesario, para garantizar que no permitamos que devres libere un bus a\u00fan registrado."}], "id": "CVE-2022-48815", "lastModified": "2025-10-06T17:05:29.747", "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": "[email protected]", "type": "Primary"}]}, "published": "2024-07-16T12:15:05.623", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/08e1a3554e99a1a5bd2835907381e2383ee85cae"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/08f1a20822349004bb9cc1b153ecb516e9f2889d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2770b795294ed312375c11ef1d0b810499c66b83"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/caabb5f64f5c32fceed93356bb688ef1ec6c5783"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/08e1a3554e99a1a5bd2835907381e2383ee85cae"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/08f1a20822349004bb9cc1b153ecb516e9f2889d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2770b795294ed312375c11ef1d0b810499c66b83"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/caabb5f64f5c32fceed93356bb688ef1ec6c5783"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "[email protected]", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: dsa: bcm_sf2: don&#39;t use devres for mdiobus", "id": "2298154", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2298154"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-99", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: dsa: bcm_sf2: don't use devres for mdiobus\nAs explained in commits:\n74b6d7d13307 (\"net: dsa: realtek: register the MDIO bus under devres\")\n5135e96a3dd2 (\"net: dsa: don't allocate the slave_mii_bus using devres\")\nmdiobus_free() will panic when called from devm_mdiobus_free() <-\ndevres_release_all() <- __device_release_driver(), and that mdiobus was\nnot previously unregistered.\nThe Starfighter 2 is a platform device, so the initial set of\nconstraints that I thought would cause this (I2C or SPI buses which call\n->remove on ->shutdown) do not apply. But there is one more which\napplies here.\nIf the DSA master itself is on a bus that calls ->remove from ->shutdown\n(like dpaa2-eth, which is on the fsl-mc bus), there is a device link\nbetween the switch and the DSA master, and device_links_unbind_consumers()\nwill unbind the bcm_sf2 switch driver on shutdown.\nSo the same treatment must be applied to all DSA switch drivers, which\nis: either use devres for both the mdiobus allocation and registration,\nor don't use devres at all.\nThe bcm_sf2 driver has the code structure in place for orderly mdiobus\nremoval, so just replace devm_mdiobus_alloc() with the non-devres\nvariant, and add manual free where necessary, to ensure that we don't\nlet devres free a still-registered bus."], "name": "CVE-2022-48815", "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": "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": "2024-07-16T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-48815\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-48815\nhttps://lore.kernel.org/linux-cve-announce/2024071648-CVE-2022-48815-9659@gregkh/T"], "threat_severity": "Low"}