CVE-2021-26318: Side-channels Related to the x86 PREFETCH Instruction
First published: Wed Oct 13 2021(Updated: )
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.
Credit: psirt@amd.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Amd Athlon Firmware | ||
| AMD Athlon | ||
| Amd Athlon Pro Firmware | ||
| AMD Athlon Pro | ||
| Amd Epyc Firmware | ||
| AMD EPYC | ||
| Amd Ryzen Firmware | ||
| AMD CPUs | ||
| Amd Ryzen Pro Firmware | ||
| Amd Ryzen Pro |
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Frequently Asked Questions
What is the severity of CVE-2021-26318?
CVE-2021-26318 has been classified with a high severity due to its potential to leak sensitive kernel address space information.
How do I fix CVE-2021-26318?
To mitigate CVE-2021-26318, users should apply the latest firmware updates provided by AMD for their affected CPUs.
Which AMD CPUs are affected by CVE-2021-26318?
CVE-2021-26318 affects specific AMD firmware versions, particularly those associated with AMD Athlon, Athlon Pro, EPYC, and Ryzen.
How does CVE-2021-26318 exploit kernel address space?
CVE-2021-26318 exploits a timing and power-based side channel through x86 PREFETCH instructions, enabling potential information leakage.
Is there a workaround for CVE-2021-26318?
Currently, the recommended workaround for CVE-2021-26318 is to ensure that all affected systems are promptly updated to the latest firmware versions.
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