CVE-2021-46941
usb: dwc3: core: Do core softreset when switch mode
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
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/
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/
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/
CVSS Scores
SSVC
- Decision:Track
Timeline
- 2024-02-25 CVE Reserved
- 2024-02-27 CVE Published
- 2024-12-19 CVE Updated
- 2025-04-06 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
CAPEC
References (5)
| URL | Tag | Source |
|---|---|---|
| https://git.kernel.org/stable/c/41ce1456e1dbbc7355d0fcc10cf7c337c13def24 | Vuln. Introduced |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.12 < 5.10.36 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.12 < 5.10.36" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.12 < 5.11.20 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.12 < 5.11.20" | en |
Affected
| ||||||
| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.12 < 5.12.3 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.12 < 5.12.3" | en |
Affected
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| Linux Search vendor "Linux" | Linux Kernel Search vendor "Linux" for product "Linux Kernel" | >= 4.12 < 5.13 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.12 < 5.13" | en |
Affected
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