Executive Summary

Summary
Title Linux kernel vulnerability
Informations
Name USN-4320-1 First vendor Publication 2020-04-06
Vendor Ubuntu Last vendor Modification 2020-04-06
Severity (Vendor) N/A Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Overall CVSS Score 7.1
Base Score 7.1 Environmental Score 7.1
impact SubScore 5.2 Temporal Score 7.1
Exploitabality Sub Score 1.8
 
Attack Vector Local Attack Complexity Low
Privileges Required Low User Interaction None
Scope Unchanged Confidentiality Impact High
Integrity Impact None Availability Impact High
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:L/Au:N/C:P/I:N/A:P)
Cvss Base Score 3.6 Attack Range Local
Cvss Impact Score 4.9 Attack Complexity Low
Cvss Expoit Score 3.9 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS - Ubuntu 14.04 ESM

Summary:

The system could be made to crash or expose sensitive information.

Software Description: - linux: Linux kernel - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - linux-kvm: Linux kernel for cloud environments - linux-raspi2: Linux kernel for Raspberry Pi 2 - linux-snapdragon: Linux kernel for Snapdragon processors - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

Al Viro discovered that the vfs layer in the Linux kernel contained a use- after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly expose sensitive information (kernel memory).

Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 16.04 LTS:
linux-image-4.4.0-1069-kvm 4.4.0-1069.76
linux-image-4.4.0-1105-aws 4.4.0-1105.116
linux-image-4.4.0-1131-raspi2 4.4.0-1131.140
linux-image-4.4.0-1135-snapdragon 4.4.0-1135.143
linux-image-4.4.0-177-generic 4.4.0-177.207
linux-image-4.4.0-177-generic-lpae 4.4.0-177.207
linux-image-4.4.0-177-lowlatency 4.4.0-177.207
linux-image-4.4.0-177-powerpc-e500mc 4.4.0-177.207
linux-image-4.4.0-177-powerpc-smp 4.4.0-177.207
linux-image-4.4.0-177-powerpc64-emb 4.4.0-177.207
linux-image-4.4.0-177-powerpc64-smp 4.4.0-177.207
linux-image-aws 4.4.0.1105.109
linux-image-generic 4.4.0.177.185
linux-image-generic-lpae 4.4.0.177.185
linux-image-kvm 4.4.0.1069.69
linux-image-lowlatency 4.4.0.177.185
linux-image-powerpc-e500mc 4.4.0.177.185
linux-image-powerpc-smp 4.4.0.177.185
linux-image-powerpc64-emb 4.4.0.177.185
linux-image-powerpc64-smp 4.4.0.177.185
linux-image-raspi2 4.4.0.1131.131
linux-image-snapdragon 4.4.0.1135.127
linux-image-virtual 4.4.0.177.185

Ubuntu 14.04 ESM:
linux-image-4.4.0-1065-aws 4.4.0-1065.69
linux-image-4.4.0-177-generic 4.4.0-177.207~14.04.1
linux-image-4.4.0-177-generic-lpae 4.4.0-177.207~14.04.1
linux-image-4.4.0-177-lowlatency 4.4.0-177.207~14.04.1
linux-image-4.4.0-177-powerpc-e500mc 4.4.0-177.207~14.04.1
linux-image-4.4.0-177-powerpc-smp 4.4.0-177.207~14.04.1
linux-image-4.4.0-177-powerpc64-emb 4.4.0-177.207~14.04.1
linux-image-4.4.0-177-powerpc64-smp 4.4.0-177.207~14.04.1
linux-image-aws 4.4.0.1065.66
linux-image-generic-lpae-lts-xenial 4.4.0.177.156
linux-image-generic-lts-xenial 4.4.0.177.156
linux-image-lowlatency-lts-xenial 4.4.0.177.156
linux-image-powerpc-e500mc-lts-xenial 4.4.0.177.156
linux-image-powerpc-smp-lts-xenial 4.4.0.177.156
linux-image-powerpc64-emb-lts-xenial 4.4.0.177.156
linux-image-powerpc64-smp-lts-xenial 4.4.0.177.156
linux-image-virtual-lts-xenial 4.4.0.177.156

After a standard system update you need to reboot your computer to make all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well.

References:
https://usn.ubuntu.com/4320-1
CVE-2020-8428

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.4.0-177.207
https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1105.116
https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1069.76
https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1131.140
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1135.143

Original Source

Url : http://www.ubuntu.com/usn/USN-4320-1

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-416 Use After Free

CPE : Common Platform Enumeration

TypeDescriptionCount
Os 3327

Alert History

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0
1
Date Informations
2020-05-23 13:03:46
  • Multiple Updates
2020-04-07 00:17:31
  • First insertion