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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2021-47434 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: xhci: Fix command ring pointer corruption while aborting a command The command ring pointer is located at [6:63] bits of the command ring control register (CRCR). All the control bits like command stop, abort are located at [0:3] bits. While aborting a command, we read the CRCR and set the abort bit and write to the CRCR. The read will always give command ring pointer as all zeros. So we essentially write only the control bits. Since we split the 64 bit write into two 32 bit writes, there is a possibility of xHC command ring stopped before the upper dword (all zeros) is written. If that happens, xHC updates the upper dword of its internal command ring pointer with all zeros. Next time, when the command ring is restarted, we see xHC memory access failures. Fix this issue by only writing to the lower dword of CRCR where all control bits are located.


Metrics

 
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CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/01c2dcb67e71c351006dd17cbba86c26b7f61eaf CVE, kernel.org Patch 
https://git.kernel.org/stable/c/22bcb65ea41072ab5d03c0c6290e04e0df6d09a0 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/62c182b5e763e5f4062e72678e72ce3e02dd4d1b CVE, kernel.org Patch 
https://git.kernel.org/stable/c/dec944bb7079b37968cf69c8a438f91f15c4cc61 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/e54abefe703ab7c4e5983e889babd1447738ca42 CVE, kernel.org Patch 
https://git.kernel.org/stable/c/ff0e50d3564f33b7f4b35cadeabd951d66cfc570 CVE, kernel.org Patch 

Weakness Enumeration

CWE-ID CWE Name Source
NVD-CWE-noinfo Insufficient Information cwe source acceptance level NIST  

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Change History

4 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-47434
NVD Published Date:
05/22/2024
NVD Last Modified:
09/25/2025
Source:
kernel.org