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Vulnerability of Linux kernel: privilege escalation via Dot Session Keyrings

Synthesis of the vulnerability 

An attacker can bypass restrictions via Dot Session Keyrings on the Linux kernel, in order to escalate his privileges.
Impacted software: Debian, Fedora, QRadar SIEM, Linux, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this computer vulnerability: 2/4.
Creation date: 27/04/2017.
Références of this announce: 2011746, CERTFR-2017-AVI-162, CERTFR-2017-AVI-169, CERTFR-2017-AVI-287, CERTFR-2017-AVI-307, CERTFR-2017-AVI-390, CVE-2016-9604, DLA-922-1, FEDORA-2017-0aa0f69e0c, FEDORA-2017-17d1c05236, RHSA-2017:1842-01, RHSA-2017:2077-01, RHSA-2017:2669-01, SUSE-SU-2017:1360-1, SUSE-SU-2017:2920-1, USN-3312-1, USN-3312-2, USN-3314-1, USN-3361-1, USN-3422-1, USN-3422-2, VIGILANCE-VUL-22576.

Description of the vulnerability 

An attacker can bypass restrictions via Dot Session Keyrings on the Linux kernel, in order to escalate his privileges.
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This vulnerability bulletin impacts software or systems such as Debian, Fedora, QRadar SIEM, Linux, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

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

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

An attacker with a expert ability can exploit this cybersecurity note.

Solutions for this threat 

Linux kernel: version 4.10.13.
The version 4.10.13 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.25.
The version 4.9.25 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.64.
The version 4.4.64 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.1.40.
The version 4.1.40 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 3.18.51.
The version 3.18.51 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

Linux kernel: version 3.16.44.
The version 3.16.44 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/linux-3.16.44.tar.xz

Linux kernel: version 3.12.74.
The version 3.12.74 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/

Linux kernel: version 3.10.106.
The version 3.10.106 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/linux-3.10.106.tar.xz

Linux kernel: version 3.2.89.
The version 3.2.89 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v3.x/linux-3.2.89.tar.xz

Linux kernel: patch for Dot Session Keyrings.
A patch is indicated in information sources.

Debian: new linux packages.
New packages are available:
  Debian 7: linux 3.2.88-1
  Debian 8: linux 3.16.43-1

Fedora 24: new kernel packages.
New packages are available:
  Fedora 24: kernel 4.10.13-100.fc24

Fedora 25: new kernel packages.
New packages are available:
  Fedora 25: kernel 4.10.13-200.fc25

IBM QRadar Network Security: solution for Linux.
The solution is indicated in information sources.

RHEL 6: new kernel-rt packages.
New packages are available:
  RHEL 6: kernel-rt 3.10.0-693.2.1.rt56.585.el6rt

RHEL 7: new kernel packages.
New packages are available:
  RHEL 7: kernel 3.10.0-693.el7

RHEL 7: new kernel-rt packages.
New packages are available:
  RHEL 7: kernel-rt 3.10.0-693.rt56.617.el7

SUSE LE 12 RTM: new kernel packages.
New packages are available:
  SUSE LE 12 RTM: kernel 3.12.61-52.101.1

SUSE LE 12 SP1: new kernel packages.
New packages are available:
  SUSE LE 12 SP1: kernel 3.12.74-60.64.40.1

Ubuntu 16.04: new linux-image-generic packages (21/07/2017).
New packages are available:
  Ubuntu 16.04 LTS: linux-image-generic 4.10.0.27.30

Ubuntu: new linux-image-3.13.0 packages.
New packages are available:
  Ubuntu 12.04 ESM: linux-image-3.13.0-132-generic 3.13.0-132.181~precise1
  Ubuntu 14.04 LTS: linux-image-3.13.0-132-generic 3.13.0-132.181

Ubuntu: new linux-image-4.10.0 packages.
New packages are available:
  Ubuntu 17.04: linux-image-4.10.0-22-generic 4.10.0-22.24, linux-image-generic 4.10.0.22.24

Ubuntu: new linux-image-4.4.0 packages.
New packages are available:
  Ubuntu 14.04 LTS: linux-image 4.4.0-79.100~14.04.1
  Ubuntu 16.04 LTS: linux-image 4.4.0-79.100
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