Improper Input Validation Affecting kernel-rt-debug package, versions *


Severity

Recommended
low

Based on CentOS security rating.

Threat Intelligence

EPSS
0.04% (6th percentile)

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  • Snyk IDSNYK-CENTOS7-KERNELRTDEBUG-6302331
  • published28 Feb 2024
  • disclosed27 Feb 2024

Introduced: 27 Feb 2024

CVE-2021-46941  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

There is no fixed version for Centos:7 kernel-rt-debug.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug package and not the kernel-rt-debug package as distributed by Centos. See How to fix? for Centos:7 relevant fixed versions and status.

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

version 3.1