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CVE PROGRAM SOURCE RECORDUnscored

CVE-2021-47434

xhci: Fix command ring pointer corruption while aborting a command

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • b92cc66c047ff7cf587b318fe377061a353c120f to < 22bcb65ea41072ab5d03c0c6290e04e0df6d09a0affected
  • b92cc66c047ff7cf587b318fe377061a353c120f to < 62c182b5e763e5f4062e72678e72ce3e02dd4d1baffected
  • b92cc66c047ff7cf587b318fe377061a353c120f to < 01c2dcb67e71c351006dd17cbba86c26b7f61eafaffected
  • b92cc66c047ff7cf587b318fe377061a353c120f to < dec944bb7079b37968cf69c8a438f91f15c4cc61affected
  • b92cc66c047ff7cf587b318fe377061a353c120f to < e54abefe703ab7c4e5983e889babd1447738ca42affected
  • b92cc66c047ff7cf587b318fe377061a353c120f to < ff0e50d3564f33b7f4b35cadeabd951d66cfc570affected
  • bc47204b268516ae4085ebdc81a34ddda71b77c4affected
  • 88bd928daafb5912c269af628b1e5347620c9a62affected
  • 2818247b6565b7adfbcd53b74509448a8e1fad84affected
  • ef6273930e170a4f70a2c7f57a214813c5cf30bbaffected
  • f83994f3e2438b982fb9821d948199b3327638d8affected
  • 3.0.49 to < 3.1affected
  • 3.2.32 to < 3.3affected
  • 3.4.13 to < 3.5affected
  • 3.5.6 to < 3.6affected
  • 3.6.1 to < 3.7affected

Linux Linux

Default version status: affected

  • 3.7affected
  • 0 to < 3.7unaffected
  • 4.14.252 to ≤ 4.14.*unaffected
  • 4.19.213 to ≤ 4.19.*unaffected
  • 5.4.155 to ≤ 5.4.*unaffected
  • 5.10.75 to ≤ 5.10.*unaffected
  • 5.14.14 to ≤ 5.14.*unaffected
  • 5.15 to ≤ *unaffected

References