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Vulnerability of Linux kernel: privilege escalation via event-ctx

Synthesis of the vulnerability 

An attacker can bypass restrictions via event->ctx on the Linux kernel, in order to escalate his privileges.
Impacted systems: Debian, Android OS, Linux.
Severity of this alert: 2/4.
Number of vulnerabilities in this bulletin: 2.
Creation date: 23/02/2017.
Références of this alert: 1403842, CVE-2016-6786, CVE-2016-6787, DLA-833-1, VIGILANCE-VUL-21935.

Description of the vulnerability 

An attacker can bypass restrictions via event->ctx on the Linux kernel, in order to escalate his privileges.
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This vulnerability impacts software or systems such as Debian, Android OS, Linux.

Our Vigil@nce team determined that the severity of this security announce is medium.

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

This bulletin is about 2 vulnerabilities.

An attacker with a expert ability can exploit this computer vulnerability note.

Solutions for this threat 

Linux kernel: version 3.18.54.
The version 3.18.54 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

Linux kernel: version 3.16.40.
The version 3.16.40 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

Linux kernel: version 3.2.85.
The version 3.2.85 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

Linux kernel: patch for event-ctx.
A patch is indicated in information sources.

Android OS: patch of 2016-12-05.
A patch is indicated in information sources.

Debian 7: new linux packages.
New packages are available:
  Debian 7: linux 3.2.84-2
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