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CVE-2021-26318

Published: 13 October 2021

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.

Notes

AuthorNote
mdeslaur
no details on microcode update as of 2022-01-05

Priority

Medium

Cvss 3 Severity Score

4.7

Score breakdown

Status

Package Release Status
amd64-microcode
Launchpad, Ubuntu, Debian
upstream Needs triage

bionic Deferred

focal Deferred

hirsute Ignored
(end of life)
impish Ignored
(end of life)
trusty Deferred

xenial Deferred
(2022-03-08)
kinetic Ignored
(end of life, was deferred)
jammy Deferred

mantic Deferred

lunar Ignored
(end of life, was deferred)

Severity score breakdown

Parameter Value
Base score 4.7
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N