CVE-2021-46941

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-46941
In the Linux kernel, the following vulnerability has been resolved: usb: dwc3: core: Do core softreset when switch mode According to the programming guide, to switch mode for DRD controller, the driver needs to do the following. To switch from device to host: 1. Reset controller with GCTL.CoreSoftReset 2. Set GCTL.PrtCapDir(host mode) 3. Reset the host with USBCMD.HCRESET 4. Then follow up with the initializing host registers sequence To switch from host to device: 1. Reset controller with GCTL.CoreSoftReset 2. Set GCTL.PrtCapDir(device mode) 3. Reset the device with DCTL.CSftRst 4. Then follow up with the initializing registers sequence Currently we're missing step 1) to do GCTL.CoreSoftReset and step 3) of switching from host to device. John Stult reported a lockup issue seen with HiKey960 platform without these steps[1]. Similar issue is observed with Ferry's testing platform[2]. So, apply the required steps along with some fixes to Yu Chen's and John Stultz's version. The main fixes to their versions are the missing wait for clocks synchronization before clearing GCTL.CoreSoftReset and only apply DCTL.CSftRst when switching from host to device. [1] https://lore.kernel.org/linux-usb/20210108015115.27920-1-john.stultz@linaro.org/ [2] https://lore.kernel.org/linux-usb/0ba7a6ba-e6a7-9cd4-0695-64fc927e01f1@gmail.com/

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/1c10fd60c8595ea7ff7e29d3cf1fa88069941da3 Patch
https://git.kernel.org/stable/c/800f58217626c8b147aa40660e572ed8a0d56e3b Patch
https://git.kernel.org/stable/c/f88359e1588b85cf0e8209ab7d6620085f3441d9 Patch
https://git.kernel.org/stable/c/fce7bbcd07d59ac30dba8ce225316b3b4c1c7b50 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:*:*:*:*:*:*:*:*
History

10 Apr 2024, 19:42

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/1c10fd60c8595ea7ff7e29d3cf1fa88069941da3 - () https://git.kernel.org/stable/c/1c10fd60c8595ea7ff7e29d3cf1fa88069941da3 - Patch
References () https://git.kernel.org/stable/c/800f58217626c8b147aa40660e572ed8a0d56e3b - () https://git.kernel.org/stable/c/800f58217626c8b147aa40660e572ed8a0d56e3b - Patch
References () https://git.kernel.org/stable/c/f88359e1588b85cf0e8209ab7d6620085f3441d9 - () https://git.kernel.org/stable/c/f88359e1588b85cf0e8209ab7d6620085f3441d9 - Patch
References () https://git.kernel.org/stable/c/fce7bbcd07d59ac30dba8ce225316b3b4c1c7b50 - () https://git.kernel.org/stable/c/fce7bbcd07d59ac30dba8ce225316b3b4c1c7b50 - Patch
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usb: dwc3: core: Realiza un reinicio suave del núcleo al cambiar de modo Según la guía de programación, para cambiar el modo del controlador DRD, el controlador debe hacer lo siguiente. Para cambiar de dispositivo a host: 1. Reinicie el controlador con GCTL.CoreSoftReset 2. Configure GCTL.PrtCapDir (modo de host) 3. Reinicie el host con USBCMD.HCRESET 4. Luego siga con la secuencia de inicialización de registros del host Para cambiar de host a dispositivo: 1. Reinicie el controlador con GCTL.CoreSoftReset 2. Configure GCTL.PrtCapDir (modo de dispositivo) 3. Reinicie el dispositivo con DCTL.CSftRst 4. Luego siga con la secuencia de inicialización de registros Actualmente nos falta el paso 1) para hacer GCTL .CoreSoftReset y paso 3) de cambio de host a dispositivo. John Stult informó un problema de bloqueo observado con la plataforma HiKey960 sin estos pasos[1]. Se observa un problema similar con la plataforma de pruebas de Ferry[2]. Entonces, aplique los pasos requeridos junto con algunas correcciones a la versión de Yu Chen y John Stultz. Las principales correcciones a sus versiones son la falta de espera para la sincronización de los relojes antes de borrar GCTL.CoreSoftReset y solo aplicar DCTL.CSftRst al cambiar de host a dispositivo. [1] https://lore.kernel.org/linux-usb/20210108015115.27920-1-john.stultz@linaro.org/ [2] https://lore.kernel.org/linux-usb/0ba7a6ba-e6a7- 9cd4-0695-64fc927e01f1@gmail.com/
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
CWE NVD-CWE-noinfo
First Time Linux linux Kernel
Linux
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

27 Feb 2024, 19:04

Type Values Removed Values Added
New CVE
Information

Published : 2024-02-27 19:04

Updated : 2024-04-10 19:42

NVD link : CVE-2021-46941

Mitre link : CVE-2021-46941

CVE.ORG link : CVE-2021-46941

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
NVD-CWE-noinfo