Debian DSA-3396-1 : linux - security update

medium Nessus Plugin ID 86832
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The remote Debian host is missing a security-related update.

Description

Several vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service.

- CVE-2015-5307 Ben Serebrin from Google discovered a guest to host denial of service flaw affecting the KVM hypervisor. A malicious guest can trigger an infinite stream of 'alignment check' (#AC) exceptions causing the processor microcode to enter an infinite loop where the core never receives another interrupt. This leads to a panic of the host kernel.

- CVE-2015-7833 Sergej Schumilo, Hendrik Schwartke and Ralf Spenneberg discovered a flaw in the processing of certain USB device descriptors in the usbvision driver. An attacker with physical access to the system can use this flaw to crash the system.

- CVE-2015-7872 Dmitry Vyukov discovered a vulnerability in the keyrings garbage collector allowing a local user to trigger a kernel panic.

- CVE-2015-7990 It was discovered that the fix for CVE-2015-6937 was incomplete. A race condition when sending a message on unbound socket can still cause a NULL pointer dereference. A remote attacker might be able to cause a denial of service (crash) by sending a crafted packet.

Solution

Upgrade the linux packages.

For the oldstable distribution (wheezy), these problems have been fixed in version 3.2.68-1+deb7u6.

For the stable distribution (jessie), these problems have been fixed in version 3.16.7-ckt11-1+deb8u6.

See Also

https://security-tracker.debian.org/tracker/CVE-2015-5307

https://security-tracker.debian.org/tracker/CVE-2015-7833

https://security-tracker.debian.org/tracker/CVE-2015-7872

https://security-tracker.debian.org/tracker/CVE-2015-7990

https://security-tracker.debian.org/tracker/CVE-2015-6937

https://packages.debian.org/source/jessie/linux

https://www.debian.org/security/2015/dsa-3396

Plugin Details

Severity: Medium

ID: 86832

File Name: debian_DSA-3396.nasl

Version: 2.7

Type: local

Agent: unix

Published: 11/11/2015

Updated: 1/11/2021

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: Medium

Score: 4.7

CVSS v2

Risk Factor: Medium

Base Score: 5.9

Vector: AV:L/AC:M/Au:N/C:P/I:P/A:C

CVSS v3

Risk Factor: Medium

Base Score: 5.8

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:linux, cpe:/o:debian:debian_linux:7.0, cpe:/o:debian:debian_linux:8.0

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

Patch Publication Date: 11/10/2015

Vulnerability Publication Date: 10/19/2015

Reference Information

CVE: CVE-2015-5307, CVE-2015-7833, CVE-2015-7872, CVE-2015-7990

DSA: 3396