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Ubuntu 16.04 LTS : Linux kernel vulnerabilities (USN-4463-1)

medium Nessus Plugin ID 139662

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Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 16.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4463-1 advisory.

 It was discovered that the bcache subsystem in the Linux kernel did not properly release a lock in some error conditions. A local attacker could possibly use this to cause a denial of service. (CVE-2020-12771)

 Kyungtae Kim discovered that the USB testing driver in the Linux kernel did not properly deallocate memory on disconnect events. A physically proximate attacker could use this to cause a denial of service (memory exhaustion). (CVE-2020-15393)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected kernel package.

See Also

https://ubuntu.com/security/notices/USN-4463-1

Plugin Details

Severity: Medium

ID: 139662

File Name: ubuntu_USN-4463-1.nasl

Version: 1.9

Type: local

Agent: unix

Published: 8/18/2020

Updated: 8/27/2024

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4.9

Temporal Score: 3.8

Vector: CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2020-12771

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS Score Source: CVE-2020-15393

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-187-generic, cpe:/o:canonical:ubuntu_linux:16.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1141-snapdragon, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1112-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-187-generic-lpae, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-187-powerpc64-smp, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-187-powerpc-smp, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1137-raspi2, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-187-powerpc-e500mc, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-187-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-1078-kvm, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.4.0-187-powerpc64-emb

Required KB Items: Host/cpu, Host/Ubuntu, Host/Ubuntu/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/18/2020

Vulnerability Publication Date: 5/9/2020

Reference Information

CVE: CVE-2020-12771, CVE-2020-15393

USN: 4463-1