CVE-2021-47434 (GCVE-0-2021-47434)

Vulnerability from cvelistv5 – Published: 2024-05-22 06:19 – Updated: 2025-12-18 11:37
VLAI?
Title
xhci: Fix command ring pointer corruption while aborting a command
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b92cc66c047ff7cf587b318fe377061a353c120f , < 22bcb65ea41072ab5d03c0c6290e04e0df6d09a0 (git)
Affected: b92cc66c047ff7cf587b318fe377061a353c120f , < 62c182b5e763e5f4062e72678e72ce3e02dd4d1b (git)
Affected: b92cc66c047ff7cf587b318fe377061a353c120f , < 01c2dcb67e71c351006dd17cbba86c26b7f61eaf (git)
Affected: b92cc66c047ff7cf587b318fe377061a353c120f , < dec944bb7079b37968cf69c8a438f91f15c4cc61 (git)
Affected: b92cc66c047ff7cf587b318fe377061a353c120f , < e54abefe703ab7c4e5983e889babd1447738ca42 (git)
Affected: b92cc66c047ff7cf587b318fe377061a353c120f , < ff0e50d3564f33b7f4b35cadeabd951d66cfc570 (git)
Affected: bc47204b268516ae4085ebdc81a34ddda71b77c4 (git)
Affected: 88bd928daafb5912c269af628b1e5347620c9a62 (git)
Affected: 2818247b6565b7adfbcd53b74509448a8e1fad84 (git)
Affected: ef6273930e170a4f70a2c7f57a214813c5cf30bb (git)
Affected: f83994f3e2438b982fb9821d948199b3327638d8 (git)
Create a notification for this product.
    Linux Linux Affected: 3.7
Unaffected: 0 , < 3.7 (semver)
Unaffected: 4.14.252 , ≤ 4.14.* (semver)
Unaffected: 4.19.213 , ≤ 4.19.* (semver)
Unaffected: 5.4.155 , ≤ 5.4.* (semver)
Unaffected: 5.10.75 , ≤ 5.10.* (semver)
Unaffected: 5.14.14 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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