Controller failure via command-ring pointer corruption
Published May 22, 2024 · Updated May 23, 2026
A race in the Linux xHCI driver allows local users to cause controller memory-access failures through command-ring pointer corruption. The abort path reads CRCR with zeroed pointer bits, then splits a 64-bit write so the controller can stop before an all-zero upper dword overwrites its internal ring pointer. Reaching the flaw requires low-privileged local access, an xHCI controller, and command-abort timing; the bounded consequence is controller memory-access failure.
Summary
What happened
A race in the Linux xHCI driver allows local users to cause controller memory-access failures through command-ring pointer corruption. The abort path reads CRCR with zeroed pointer bits, then splits a 64-bit write so the controller can stop before an all-zero upper dword overwrites its internal ring pointer. Reaching the flaw requires low-privileged local access, an xHCI controller, and command-abort timing; the bounded consequence is controller memory-access failure.
The record
- CVE
- CVE-2021-47434
- Published
- May 22, 2024
- Updated
- May 23, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 22, 2024CVE publishedPublication date reported by the CVE source.
- May 23, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2818247b6565b7adfbcd53b74509448a8e1fad84
- Affected versionversion=3.0.49 <3.1
- Affected versionversion=3.2.32 <3.3
- Affected versionversion=3.4.13 <3.5
- Affected versionversion=3.5.6 <3.6
- Affected versionversion=3.6.1 <3.7
- Affected versionversion=3.7
- Affected versionversion=88bd928daafb5912c269af628b1e5347620c9a62
- Affected versionversion=b92cc66c047ff7cf587b318fe377061a353c120f <01c2dcb67e71c351006dd17cbba86c26b7f61eaf
- Affected versionversion=b92cc66c047ff7cf587b318fe377061a353c120f <22bcb65ea41072ab5d03c0c6290e04e0df6d09a0
- Affected versionversion=b92cc66c047ff7cf587b318fe377061a353c120f <62c182b5e763e5f4062e72678e72ce3e02dd4d1b
- Affected versionversion=b92cc66c047ff7cf587b318fe377061a353c120f <dec944bb7079b37968cf69c8a438f91f15c4cc61
- Affected versionversion=b92cc66c047ff7cf587b318fe377061a353c120f <e54abefe703ab7c4e5983e889babd1447738ca42
- Affected versionversion=b92cc66c047ff7cf587b318fe377061a353c120f <ff0e50d3564f33b7f4b35cadeabd951d66cfc570
- Affected versionversion=bc47204b268516ae4085ebdc81a34ddda71b77c4
- Affected versionversion=ef6273930e170a4f70a2c7f57a214813c5cf30bb
- Affected versionversion=f83994f3e2438b982fb9821d948199b3327638d8
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo