CVE-2021-26318
Side-channels Related to the x86 PREFETCH Instruction
MEDIUM
4.7
CVSS Score
Published: October 13, 2021 at 06:29 PM UTC
Updated: June 17, 2026 at 03:43 AM UTC
10 products affected across 1 vendorRyzen Pro FirmwareRyzen FirmwareEpyc Firmware
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Severity
MEDIUM4.7
Exploit prediction
EPSS 0.3%
Description
A timing and power-based side channel attack leveraging the x86 PREFETCH instructions on some AMD CPUs could potentially result in leaked kernel address space information.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Athlon Pro· AMDdevice
80%All versions
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1017CVSS
- Attack Vector
- LOCAL
- Complexity
- HIGH
- Privileges
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- NONE
- Availability
- NONE
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-208CWE-203
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