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Vulnerability of Linux kernel: two vulnerabilities of pciback

Synthesis of the vulnerability 

An attacker can use several vulnerabilities of Linux pciback of Xen.
Vulnerable products: Debian, Linux, openSUSE, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this weakness: 1/4.
Number of vulnerabilities in this bulletin: 2.
Creation date: 17/12/2015.
Références of this bulletin: CERTFR-2015-AVI-551, CERTFR-2015-AVI-558, CERTFR-2016-AVI-004, CERTFR-2016-AVI-073, CERTFR-2016-AVI-110, CVE-2015-8551, CVE-2015-8552, DSA-3434-1, openSUSE-SU-2016:0280-1, openSUSE-SU-2016:0301-1, openSUSE-SU-2016:0318-1, openSUSE-SU-2016:2184-1, SUSE-SU-2016:0168-1, SUSE-SU-2016:0585-1, SUSE-SU-2016:0911-1, SUSE-SU-2016:1102-1, SUSE-SU-2016:1203-1, SUSE-SU-2016:1707-1, SUSE-SU-2016:1764-1, SUSE-SU-2016:1937-1, SUSE-SU-2016:2105-1, USN-2846-1, USN-2847-1, USN-2848-1, USN-2849-1, USN-2850-1, USN-2851-1, USN-2852-1, USN-2853-1, USN-2854-1, VIGILANCE-VUL-18552, XSA-157.

Description of the vulnerability 

Several vulnerabilities were announced in Linux pciback.

An attacker can force a NULL pointer to be dereferenced in MSI Code, in order to trigger a denial of service. [severity:1/4; CVE-2015-8551]

An attacker can trigger an error with XEN_PCI_OP_enable_msi, in order to trigger a denial of service. [severity:1/4; CVE-2015-8552]
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This weakness alert impacts software or systems such as Debian, Linux, openSUSE, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this computer vulnerability note is low.

The trust level is of type confirmed by the editor, with an origin of privileged shell.

This bulletin is about 2 vulnerabilities.

An attacker with a expert ability can exploit this security bulletin.

Solutions for this threat 

Linux kernel: patch for Xen pciback.
A patch is available:
  http://xenbits.xen.org/xsa/advisory-157.html

Debian: new linux packages (06/01/2016).
New packages are available:
  Debian 7: linux 3.2.73-2+deb7u2
  Debian 8: linux 3.16.7-ckt20-1+deb8u2

openSUSE 13.1: new kernel packages (01/02/2016).
New packages are available:
  openSUSE 13.1: kernel 3.11.10-32.1

openSUSE 13.1: new kernel packages (30/08/2016).
New packages are available:
  openSUSE 13.1: kernel default-3.12.62-52.1

openSUSE 13.2: new kernel packages (03/02/2016).
New packages are available:
  openSUSE 13.2: kernel 3.16.7-32.1

openSUSE Leap 42.1: new kernel packages (29/01/2016).
New packages are available:
  openSUSE Leap 42.1: kernel pae-4.1.15-8.1

SUSE LE 11: new kernel packages.
New packages are available:
  SUSE LE 11 SP4: kernel 3.0.101-71.2

SUSE LE 11 SP3: new kernel packages (04/05/2016).
New packages are available:
  SUSE LE 11 SP3: kernel 3.0.101-0.47.79.1

SUSE LE 11 SP4: new kernel-rt packages (01/07/2016).
New packages are available:
  SUSE LE 11 SP4: kernel-rt 3.0.101.rt130-54.1

SUSE LE 11 SP4: new kernel-rt packages (20/04/2016).
New packages are available:
  SUSE LE 11 SP4: kernel-rt 3.0.101.rt130-51.1

SUSE LE 12: new kernel packages.
New packages are available:
  SUSE LE 12 RTM: kernel 3.12.51-52.34.1

SUSE LE 12 SP1: new kernel packages (19/08/2016).
New packages are available:
  SUSE LE 12 SP1: kernel 3.12.62-60.62.1

SUSE LE 12 SP1: new kernel packages (26/02/2016).
New packages are available:
  SUSE LE 12 SP1: kernel 3.12.53-60.30.1

SUSE LE 12 SP1: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP1: kernel-rt 3.12.58-14.1

SUSE LE 12 SP1 RT: new kernel-rt packages (02/08/2016).
New packages are available:
  SUSE LE 12 SP1: kernel-rt 3.12.61-60.18.1

Ubuntu: new linux-image packages.
New packages are available:
  Ubuntu 12.04 LTS: linux-image-3.2.0-97-generic 3.2.0-97.137
  Ubuntu 14.04 LTS: linux-image-3.13.0-74-generic 3.13.0-74.118, linux-image-3.16.0-57-generic 3.16.0-57.77~14.04.1, linux-image-3.19.0-42-generic 3.19.0-42.48~14.04.1, linux-image-4.2.0-22-generic 4.2.0-22.27~14.04.1
  Ubuntu 15.04: linux-image-3.19.0-42-generic 3.19.0-42.48
  Ubuntu 15.10: linux-image-4.2.0-22-generic 4.2.0-22.27, linux-image-4.2.0-1017-raspi2 4.2.0-1017.24
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