CVE - CVE-2021-47434

CVE-ID
CVE-2021-47434	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/01c2dcb67e71c351006dd17cbba86c26b7f61eaf URL:https://git.kernel.org/stable/c/01c2dcb67e71c351006dd17cbba86c26b7f61eaf MISC:https://git.kernel.org/stable/c/22bcb65ea41072ab5d03c0c6290e04e0df6d09a0 URL:https://git.kernel.org/stable/c/22bcb65ea41072ab5d03c0c6290e04e0df6d09a0 MISC:https://git.kernel.org/stable/c/62c182b5e763e5f4062e72678e72ce3e02dd4d1b URL:https://git.kernel.org/stable/c/62c182b5e763e5f4062e72678e72ce3e02dd4d1b MISC:https://git.kernel.org/stable/c/dec944bb7079b37968cf69c8a438f91f15c4cc61 URL:https://git.kernel.org/stable/c/dec944bb7079b37968cf69c8a438f91f15c4cc61 MISC:https://git.kernel.org/stable/c/e54abefe703ab7c4e5983e889babd1447738ca42 URL:https://git.kernel.org/stable/c/e54abefe703ab7c4e5983e889babd1447738ca42 MISC:https://git.kernel.org/stable/c/ff0e50d3564f33b7f4b35cadeabd951d66cfc570 URL:https://git.kernel.org/stable/c/ff0e50d3564f33b7f4b35cadeabd951d66cfc570
Assigning CNA
kernel.org
Date Record Created
20240521	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240521)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
This is an record on the CVE List, which provides common identifiers for publicly known cybersecurity vulnerabilities.
Search CVE Using Keywords: You can also search by reference using the CVE Reference Maps.
For More Information: CVE Request Web Form (select "Other" from dropdown)