UBUNTU-CVE-2021-26318

See a problem?
Please try reporting it to the source first.

Source

https://ubuntu.com/security/CVE-2021-26318

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-26318.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-26318

Upstream

CVE-2021-26318

Withdrawn

2026-01-27T10:41:33Z

Published

2021-10-13T19:15:00Z

Modified

2026-01-27T12:20:42.568586Z

Severity

4.7 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

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.

References

Affected packages

Ubuntu:14.04:LTS

amd64-microcode

Package

Name: amd64-microcode
Purl: pkg:deb/ubuntu/amd64-microcode@3.20180524.1~ubuntu0.14.04.2+really20130710.1ubuntu1?arch=source&distro=trusty

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.20120910-3

2.*

2.20131007.1+really20130710.1

3.*

3.20180524.1~ubuntu0.14.04.1

3.20180524.1~ubuntu0.14.04.2+really20130710.1

3.20180524.1~ubuntu0.14.04.2+really20130710.1ubuntu1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "3.20180524.1~ubuntu0.14.04.2+really20130710.1ubuntu1",
            "binary_name": "amd64-microcode"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-26318.json"

Ubuntu:20.04:LTS

amd64-microcode

Package

Name: amd64-microcode
Purl: pkg:deb/ubuntu/amd64-microcode@3.20191218.1ubuntu1.3?arch=source&distro=focal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.20181128.1ubuntu2

3.20191021.1ubuntu1

3.20191218.1ubuntu1

3.20191218.1ubuntu1.1

3.20191218.1ubuntu1.2

3.20191218.1ubuntu1.3

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "3.20191218.1ubuntu1.3",
            "binary_name": "amd64-microcode"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-26318.json"

Ubuntu:22.04:LTS

amd64-microcode

Package

Name: amd64-microcode
Purl: pkg:deb/ubuntu/amd64-microcode@3.20191218.1ubuntu2.3?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.20191218.1ubuntu2

3.20191218.1ubuntu2.1

3.20191218.1ubuntu2.2

3.20191218.1ubuntu2.3

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "3.20191218.1ubuntu2.3",
            "binary_name": "amd64-microcode"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-26318.json"

Ubuntu:24.04:LTS

amd64-microcode

Package

Name: amd64-microcode
Purl: pkg:deb/ubuntu/amd64-microcode@3.20250311.1ubuntu0.24.04.1?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.20230808.1.1ubuntu1

3.20231019.1ubuntu1

3.20231019.1ubuntu2

3.20231019.1ubuntu2.1

3.20250311.1ubuntu0.24.04.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "3.20250311.1ubuntu0.24.04.1",
            "binary_name": "amd64-microcode"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-26318.json"

Ubuntu:25.10

amd64-microcode

Package

Name: amd64-microcode
Purl: pkg:deb/ubuntu/amd64-microcode@3.20250708.1ubuntu1?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.20240820.1ubuntu1

3.20250311.1ubuntu1

3.20250708.1ubuntu1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "3.20250708.1ubuntu1",
            "binary_name": "amd64-microcode"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-26318.json"

Ubuntu:Pro:16.04:LTS

amd64-microcode

Package

Name: amd64-microcode
Purl: pkg:deb/ubuntu/amd64-microcode@3.20191021.1+really3.20180524.1~ubuntu0.16.04.2+esm3?arch=source&distro=esm-infra/xenial

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.20141028.1

2.20160316.1

3.*

3.20180524.1~ubuntu0.16.04.1

3.20180524.1~ubuntu0.16.04.2

3.20191021.1ubuntu0.16.04.1

3.20191021.1+really3.20180524.1~ubuntu0.16.04.2

3.20191021.1+really3.20180524.1~ubuntu0.16.04.2+esm1

3.20191021.1+really3.20180524.1~ubuntu0.16.04.2+esm2

3.20191021.1+really3.20180524.1~ubuntu0.16.04.2+esm3

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "3.20191021.1+really3.20180524.1~ubuntu0.16.04.2+esm3",
            "binary_name": "amd64-microcode"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-26318.json"

Ubuntu:Pro:18.04:LTS

amd64-microcode

Package

Name: amd64-microcode
Purl: pkg:deb/ubuntu/amd64-microcode@3.20191021.1+really3.20181128.1~ubuntu0.18.04.1+esm3?arch=source&distro=esm-infra/bionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.20160316.3

3.20171205.1

3.20180524.1~ubuntu0.18.04.1

3.20180524.1~ubuntu0.18.04.2

3.20191021.1ubuntu0.18.04.2

3.20191021.1+really3.20181128.1~ubuntu0.18.04.1

3.20191021.1+really3.20181128.1~ubuntu0.18.04.1+esm1

3.20191021.1+really3.20181128.1~ubuntu0.18.04.1+esm2

3.20191021.1+really3.20181128.1~ubuntu0.18.04.1+esm3

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "3.20191021.1+really3.20181128.1~ubuntu0.18.04.1+esm3",
            "binary_name": "amd64-microcode"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-26318.json"