CVE-2021-47416

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-47416
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.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/064c2616234a7394867c924b5c1303974f3a4f4d Patch
https://git.kernel.org/stable/c/0d2dd40a7be61b89a7c99dae8ee96389d27b413a Patch
https://git.kernel.org/stable/c/2250392d930bd0d989f24d355d6355b0150256e7 Patch
https://git.kernel.org/stable/c/2397b9e118721292429fea8807a698e71b94795f Patch
https://git.kernel.org/stable/c/25e9f88c7e3cc35f5e3d3db199660d28a15df639 Patch
https://git.kernel.org/stable/c/414bb4ead1362ef2c8592db723c017258f213988 Patch
https://git.kernel.org/stable/c/ca6e11c337daf7925ff8a2aac8e84490a8691905 Patch
https://git.kernel.org/stable/c/f4f502a04ee1e543825af78f47eb7785015cd9f6 Patch
https://git.kernel.org/stable/c/064c2616234a7394867c924b5c1303974f3a4f4d Patch
https://git.kernel.org/stable/c/0d2dd40a7be61b89a7c99dae8ee96389d27b413a Patch
https://git.kernel.org/stable/c/2250392d930bd0d989f24d355d6355b0150256e7 Patch
https://git.kernel.org/stable/c/2397b9e118721292429fea8807a698e71b94795f Patch
https://git.kernel.org/stable/c/25e9f88c7e3cc35f5e3d3db199660d28a15df639 Patch
https://git.kernel.org/stable/c/414bb4ead1362ef2c8592db723c017258f213988 Patch
https://git.kernel.org/stable/c/ca6e11c337daf7925ff8a2aac8e84490a8691905 Patch
https://git.kernel.org/stable/c/f4f502a04ee1e543825af78f47eb7785015cd9f6 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
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:*:*:*:*:*:*
History

31 Dec 2024, 18:53

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/064c2616234a7394867c924b5c1303974f3a4f4d - () https://git.kernel.org/stable/c/064c2616234a7394867c924b5c1303974f3a4f4d - Patch
References () https://git.kernel.org/stable/c/0d2dd40a7be61b89a7c99dae8ee96389d27b413a - () https://git.kernel.org/stable/c/0d2dd40a7be61b89a7c99dae8ee96389d27b413a - Patch
References () https://git.kernel.org/stable/c/2250392d930bd0d989f24d355d6355b0150256e7 - () https://git.kernel.org/stable/c/2250392d930bd0d989f24d355d6355b0150256e7 - Patch
References () https://git.kernel.org/stable/c/2397b9e118721292429fea8807a698e71b94795f - () https://git.kernel.org/stable/c/2397b9e118721292429fea8807a698e71b94795f - Patch
References () https://git.kernel.org/stable/c/25e9f88c7e3cc35f5e3d3db199660d28a15df639 - () https://git.kernel.org/stable/c/25e9f88c7e3cc35f5e3d3db199660d28a15df639 - Patch
References () https://git.kernel.org/stable/c/414bb4ead1362ef2c8592db723c017258f213988 - () https://git.kernel.org/stable/c/414bb4ead1362ef2c8592db723c017258f213988 - Patch
References () https://git.kernel.org/stable/c/ca6e11c337daf7925ff8a2aac8e84490a8691905 - () https://git.kernel.org/stable/c/ca6e11c337daf7925ff8a2aac8e84490a8691905 - Patch
References () https://git.kernel.org/stable/c/f4f502a04ee1e543825af78f47eb7785015cd9f6 - () https://git.kernel.org/stable/c/f4f502a04ee1e543825af78f47eb7785015cd9f6 - Patch
CWE CWE-401
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
First Time Linux
Linux linux Kernel
CPE cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*

21 Nov 2024, 06:36

Type Values Removed Values Added
Summary
  • (es) 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( .
References () https://git.kernel.org/stable/c/064c2616234a7394867c924b5c1303974f3a4f4d - () https://git.kernel.org/stable/c/064c2616234a7394867c924b5c1303974f3a4f4d -
References () https://git.kernel.org/stable/c/0d2dd40a7be61b89a7c99dae8ee96389d27b413a - () https://git.kernel.org/stable/c/0d2dd40a7be61b89a7c99dae8ee96389d27b413a -
References () https://git.kernel.org/stable/c/2250392d930bd0d989f24d355d6355b0150256e7 - () https://git.kernel.org/stable/c/2250392d930bd0d989f24d355d6355b0150256e7 -
References () https://git.kernel.org/stable/c/2397b9e118721292429fea8807a698e71b94795f - () https://git.kernel.org/stable/c/2397b9e118721292429fea8807a698e71b94795f -
References () https://git.kernel.org/stable/c/25e9f88c7e3cc35f5e3d3db199660d28a15df639 - () https://git.kernel.org/stable/c/25e9f88c7e3cc35f5e3d3db199660d28a15df639 -
References () https://git.kernel.org/stable/c/414bb4ead1362ef2c8592db723c017258f213988 - () https://git.kernel.org/stable/c/414bb4ead1362ef2c8592db723c017258f213988 -
References () https://git.kernel.org/stable/c/ca6e11c337daf7925ff8a2aac8e84490a8691905 - () https://git.kernel.org/stable/c/ca6e11c337daf7925ff8a2aac8e84490a8691905 -
References () https://git.kernel.org/stable/c/f4f502a04ee1e543825af78f47eb7785015cd9f6 - () https://git.kernel.org/stable/c/f4f502a04ee1e543825af78f47eb7785015cd9f6 -

21 May 2024, 15:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-05-21 15:15

Updated : 2024-12-31 18:53

NVD link : CVE-2021-47416

Mitre link : CVE-2021-47416

CVE.ORG link : CVE-2021-47416

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-401

Missing Release of Memory after Effective Lifetime