CVE-2021-26318

Publication date 13 October 2021

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
amd64-microcode	24.10 oracular	Vulnerable, fix deferred
	24.04 LTS noble	Vulnerable, fix deferred
	23.10 mantic	Ignored end of life, was deferred
	23.04 lunar	Ignored end of life, was deferred
	22.10 kinetic	Ignored end of life, was deferred
	22.04 LTS jammy	Vulnerable, fix deferred
	21.10 impish	Ignored end of life
	21.04 hirsute	Ignored end of life
	20.04 LTS focal	Vulnerable, fix deferred
	18.04 LTS bionic	Vulnerable, fix deferred
	16.04 LTS xenial	Vulnerable, fix deferred
	14.04 LTS trusty	Ignored end of ESM support, was deferred

Notes

mdeslaur

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

Severity score breakdown

Parameter	Value
Base score	4.7 · Medium
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