cve-2021-47434
Vulnerability from cvelistv5
Published
2024-05-22 06:19
Modified
2024-12-19 07:41
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/01c2dcb67e71c351006dd17cbba86c26b7f61eaf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/22bcb65ea41072ab5d03c0c6290e04e0df6d09a0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/62c182b5e763e5f4062e72678e72ce3e02dd4d1b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dec944bb7079b37968cf69c8a438f91f15c4cc61
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e54abefe703ab7c4e5983e889babd1447738ca42
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ff0e50d3564f33b7f4b35cadeabd951d66cfc570
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/01c2dcb67e71c351006dd17cbba86c26b7f61eaf
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/22bcb65ea41072ab5d03c0c6290e04e0df6d09a0
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/62c182b5e763e5f4062e72678e72ce3e02dd4d1b
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/dec944bb7079b37968cf69c8a438f91f15c4cc61
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e54abefe703ab7c4e5983e889babd1447738ca42
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ff0e50d3564f33b7f4b35cadeabd951d66cfc570
Impacted products
Vendor Product Version
Linux Linux
Show details on NVD website

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}


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