USN-3756-1

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Source
https://ubuntu.com/security/notices/USN-3756-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-3756-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-3756-1
Upstream
Related
Published
2018-08-27T18:48:59.389697Z
Modified
2025-10-13T04:34:43Z
Summary
intel-microcode vulnerabilities
Details

It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker in a guest virtual machine could use this to expose sensitive information (memory from other guests or the host OS). (CVE-2018-3646)

Jann Horn and Ken Johnson discovered that microprocessors utilizing speculative execution of a memory read may allow unauthorized memory reads via a sidechannel attack. This flaw is known as Spectre Variant 4. A local attacker could use this to expose sensitive information, including kernel memory. (CVE-2018-3639)

Zdenek Sojka, Rudolf Marek, Alex Zuepke, and Innokentiy Sennovskiy discovered that microprocessors that perform speculative reads of system registers may allow unauthorized disclosure of system parameters via a sidechannel attack. This vulnerability is also known as Rogue System Register Read (RSRE). An attacker could use this to expose sensitive information. (CVE-2018-3640)

References

Affected packages

Ubuntu:14.04:LTS / intel-microcode

Package

Name
intel-microcode
Purl
pkg:deb/ubuntu/intel-microcode@3.20180807a.0ubuntu0.14.04.1?arch=source&distro=trusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.20180807a.0ubuntu0.14.04.1

Affected versions

1.*

1.20130906.1ubuntu2
1.20130906.1ubuntu3

2.*

2.20140122.1
2.20140430.1ubuntu1
2.20140624-t-1ubuntu2

3.*

3.20180108.0~ubuntu14.04.2
3.20180108.0+really20170707ubuntu14.04.1
3.20180312.0~ubuntu14.04.1
3.20180425.1~ubuntu0.14.04.1
3.20180425.1~ubuntu0.14.04.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "intel-microcode",
            "binary_version": "3.20180807a.0ubuntu0.14.04.1"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map

{
    "cves": [
        {
            "id": "CVE-2018-3639",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2018-3640",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2018-3646",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "high"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:14.04:LTS"
}

Ubuntu:16.04:LTS / intel-microcode

Package

Name
intel-microcode
Purl
pkg:deb/ubuntu/intel-microcode@3.20180807a.0ubuntu0.16.04.1?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.20180807a.0ubuntu0.16.04.1

Affected versions

3.*

3.20150121.1
3.20151106.1
3.20170707.1~ubuntu16.04.0
3.20180108.0~ubuntu16.04.2
3.20180108.0+really20170707ubuntu16.04.1
3.20180312.0~ubuntu16.04.1
3.20180425.1~ubuntu0.16.04.1
3.20180425.1~ubuntu0.16.04.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "intel-microcode",
            "binary_version": "3.20180807a.0ubuntu0.16.04.1"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map

{
    "cves": [
        {
            "id": "CVE-2018-3639",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2018-3640",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2018-3646",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "high"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:16.04:LTS"
}

Ubuntu:18.04:LTS / intel-microcode

Package

Name
intel-microcode
Purl
pkg:deb/ubuntu/intel-microcode@3.20180807a.0ubuntu0.18.04.1?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.20180807a.0ubuntu0.18.04.1

Affected versions

3.*

3.20170707.1
3.20171117.1
3.20180108.1
3.20180108.1+really20171117.1
3.20180312.0~ubuntu18.04.1
3.20180425.1~ubuntu0.18.04.1
3.20180425.1~ubuntu0.18.04.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "intel-microcode",
            "binary_version": "3.20180807a.0ubuntu0.18.04.1"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map

{
    "cves": [
        {
            "id": "CVE-2018-3639",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2018-3640",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2018-3646",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "high"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:18.04:LTS"
}