CVE-2021-47434 (GCVE-0-2021-47434)
Vulnerability from cvelistv5
Published
2024-05-22 06:19
Modified
2025-12-18 11:37
Severity ?
Summary
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
Impacted products
Vendor Product Version
Linux Linux Version: b92cc66c047ff7cf587b318fe377061a353c120f
Version: b92cc66c047ff7cf587b318fe377061a353c120f
Version: b92cc66c047ff7cf587b318fe377061a353c120f
Version: b92cc66c047ff7cf587b318fe377061a353c120f
Version: b92cc66c047ff7cf587b318fe377061a353c120f
Version: b92cc66c047ff7cf587b318fe377061a353c120f
Version: bc47204b268516ae4085ebdc81a34ddda71b77c4
Version: 88bd928daafb5912c269af628b1e5347620c9a62
Version: 2818247b6565b7adfbcd53b74509448a8e1fad84
Version: ef6273930e170a4f70a2c7f57a214813c5cf30bb
Version: f83994f3e2438b982fb9821d948199b3327638d8
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