CVE-2021-47416 - Vulnerability Details

Vendors	Products
Linux	Linux Kernel

Link	Providers
https://git.kernel.org/stable/c/064c2616234a7394867c924b5c1303974f3a4f4d
https://git.kernel.org/stable/c/0d2dd40a7be61b89a7c99dae8ee96389d27b413a
https://git.kernel.org/stable/c/2250392d930bd0d989f24d355d6355b0150256e7
https://git.kernel.org/stable/c/2397b9e118721292429fea8807a698e71b94795f
https://git.kernel.org/stable/c/25e9f88c7e3cc35f5e3d3db199660d28a15df639
https://git.kernel.org/stable/c/414bb4ead1362ef2c8592db723c017258f213988
https://git.kernel.org/stable/c/ca6e11c337daf7925ff8a2aac8e84490a8691905
https://git.kernel.org/stable/c/f4f502a04ee1e543825af78f47eb7785015cd9f6
https://lore.kernel.org/linux-cve-announce/2024052154-CVE-2021-47416-7584@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2021-47416
https://www.cve.org/CVERecord?id=CVE-2021-47416

Type	Values Removed	Values Added
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel:::::::: cpe:2.3:o:linux:linux_kernel:5.15:rc1:::::: cpe:2.3:o:linux:linux_kernel:5.15:rc2:::::: cpe:2.3:o:linux:linux_kernel:5.15:rc3:::::: cpe:2.3:o:linux:linux_kernel:5.15:rc4::::::
Vendors & Products		Linux Linux linux Kernel

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Show plain JSON

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value : In the Linux kernel, the following vulnerability has been resolved: phy: mdio: fix memory leak Syzbot reported memory leak in MDIO bus interface, the problem was in wrong state logic. MDIOBUS_ALLOCATED indicates 2 states: 1. Bus is only allocated 2. Bus allocated and __mdiobus_register() fails, but device_register() was called In case of device_register() has been called we should call put_device() to correctly free the memory allocated for this device, but mdiobus_free() calls just kfree(dev) in case of MDIOBUS_ALLOCATED state To avoid this behaviour we need to set bus->state to MDIOBUS_UNREGISTERED _before_ calling device_register(), because put_device() should be called even in case of device_register() failure. (string)

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value : En el kernel de Linux, se resolvió la siguiente vulnerabilidad: phy: mdio: arreglar pérdida de memoria. Syzbot informó una pérdida de memoria en la interfaz del bus MDIO, el problema estaba en una lógica de estado incorrecta. MDIOBUS_ALLOCATED indica 2 estados: 1. El bus solo está asignado 2. El bus asignado y __mdiobus_register() falla, pero se llamó 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( . (string)

}

]

id : CVE-2021-47416 (string)

lastModified : 2024-12-31T18:53:18.000 (string)

metrics : { »

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version : 3.1 (string)

}

exploitabilityScore : 1.8 (number)

impactScore : 3.6 (number)

source : nvd@nist.gov (string)

type : Primary (string)

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}

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Show plain JSON

{"bugzilla": {"description": "kernel: phy: mdio: fix memory leak", "id": "2282319", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282319"}, "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:\nphy: mdio: fix memory leak\nSyzbot reported memory leak in MDIO bus interface, the problem was in\nwrong state logic.\nMDIOBUS_ALLOCATED indicates 2 states:\n1. Bus is only allocated\n2. Bus allocated and __mdiobus_register() fails, but\ndevice_register() was called\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\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."], "name": "CVE-2021-47416", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "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": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47416\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47416\nhttps://lore.kernel.org/linux-cve-announce/2024052154-CVE-2021-47416-7584@gregkh/T"], "threat_severity": "Low"}

{

bugzilla : { »

description : kernel: phy: mdio: fix memory leak (string)

id : 2282319 (string)

url : https://bugzilla.redhat.com/show_bug.cgi?id=2282319 (string)

}

csaw : false (boolean)

cvss3 : { »

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cvss3_scoring_vector : CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (string)

status : draft (string)

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cwe : CWE-401 (string)

details : [ »

0 : In the Linux kernel, the following vulnerability has been resolved: phy: mdio: fix memory leak Syzbot reported memory leak in MDIO bus interface, the problem was in wrong state logic. MDIOBUS_ALLOCATED indicates 2 states: 1. Bus is only allocated 2. Bus allocated and __mdiobus_register() fails, but device_register() was called In case of device_register() has been called we should call put_device() to correctly free the memory allocated for this device, but mdiobus_free() calls just kfree(dev) in case of MDIOBUS_ALLOCATED state To avoid this behaviour we need to set bus->state to MDIOBUS_UNREGISTERED _before_ calling device_register(), because put_device() should be called even in case of device_register() failure. (string)

]

name : CVE-2021-47416 (string)

package_state : [ »

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fix_state : Out of support scope (string)

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public_date : 2024-05-21T00:00:00Z (string)

references : [ »

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threat_severity : Low (string)

}

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

JSON object

JSON object

JSON object

JSON object