xhci: Fix command ring pointer corruption while aborting a command
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 3.0.49 to before 3.1; 3.2.32 to before 3.3; 3.4.13 to before 3.5; 3.5.6 to before 3.6; 3.6.1 to before 3.7 | 3.1, 3.3, 3.5, 3.6, 3.7 | Patch available | CNA |
| Linux | Linux | 3.7 and later | 4.14.252, 4.19.213, 5.4.155, 5.10.75, 5.14.14, 5.15 | Patch available | CNA |
- Linux VendorLinux Affected 3.0.49 to before 3.1; 3.2.32 to before 3.3; 3.4.13 to before 3.5; 3.5.6 to before 3.6; 3.6.1 to before 3.7 Fixed in 3.1, 3.3, 3.5, 3.6, 3.7 Patch available CNA
- Linux VendorLinux Affected 3.7 and later Fixed in 4.14.252, 4.19.213, 5.4.155, 5.10.75, 5.14.14, 5.15 Patch available CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | before 4.14.252; 4.15 to before 4.19.213; 4.20 to before 5.4.155; 5.5 to before 5.10.75; 5.11 to before 5.14.14 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:* | 5.15 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:* | 5.15 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:* | 5.15 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:* | 5.15 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:* | 5.15 rc5 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions before 4.14.252; 4.15 to before 4.19.213; 4.20 to before 5.4.155; 5.5 to before 5.10.75; 5.11 to before 5.14.14 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:* Versions 5.15 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:* Versions 5.15 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:* Versions 5.15 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:* Versions 5.15 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:* Versions 5.15 rc5 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 3.1, 3.3, 3.5, 3.6, 3.7
- Fix · CNA Linux (Linux) Fixed in 4.14.252, 4.19.213, 5.4.155, 5.10.75, 5.14.14, 5.15
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
Not affected: 2 products
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2021-47434
- 2026-10-03 Alias added: GHSA-5ggq-5m2f-79jm
References
Patch 6
- https://git.kernel.org/stable/c/22bcb65ea41072ab5d03c0c6290e04e0df6d09a0
- https://git.kernel.org/stable/c/62c182b5e763e5f4062e72678e72ce3e02dd4d1b
- https://git.kernel.org/stable/c/01c2dcb67e71c351006dd17cbba86c26b7f61eaf
- https://git.kernel.org/stable/c/dec944bb7079b37968cf69c8a438f91f15c4cc61
- https://git.kernel.org/stable/c/e54abefe703ab7c4e5983e889babd1447738ca42
- https://git.kernel.org/stable/c/ff0e50d3564f33b7f4b35cadeabd951d66cfc570
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Sources
- CVE-2021-47434 · CVE Program
- CVE-2021-47434 · NVD
- FIRST EPSS
- GHSA-5ggq-5m2f-79jm · GitHub Advisory Database · CC BY 4.0
- CVE-2021-47434 · Red Hat security data · CC BY 4.0
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