What is CVE-2021-26318?

CVE-2021-26318 is a medium-severity vulnerability in Amd All Supported Processors, classified under CWE-208. CVSS score: 4.7/10. Published 2021-10-13.

How severe is CVE-2021-26318?

Medium severity. CVSS v3 base score is 4.7 out of 10.

Is CVE-2021-26318 known to be exploited?

4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Amd All Supported Processors

CVE-2021-26318

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.

EPSS: 0.003 (23.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

Amd All Supported Processors — versions unspecified
Amd Athlon
Amd Athlon_firmware
Amd Athlon_pro
Amd Athlon_pro_firmware
Amd Epyc
Amd Epyc_firmware
Amd Ryzen
Amd Ryzen_firmware
Amd Ryzen_pro

Weakness classification (CWE)

Public proof-of-concept exploits

References

psirt@amd.com (x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2021-26318?: CVE-2021-26318 is a medium-severity vulnerability in Amd All Supported Processors, classified under CWE-208. CVSS score: 4.7/10. Published 2021-10-13.
How severe is CVE-2021-26318?: Medium severity. CVSS v3 base score is 4.7 out of 10.
Is CVE-2021-26318 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.