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Vulnerability of Linux kernel: use after free

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Vulnerable systems: Debian, Linux, openSUSE Leap, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this threat: 1/4.
Creation date: 29/04/2019.
Références of this weakness: 1752, CERTFR-2019-AVI-330, CERTFR-2019-AVI-337, CERTFR-2019-AVI-346, CERTFR-2019-AVI-355, CERTFR-2019-AVI-368, CERTFR-2019-AVI-419, CERTFR-2019-AVI-428, CERTFR-2019-AVI-440, CERTFR-2019-AVI-441, CERTFR-2019-AVI-458, CERTFR-2019-AVI-478, CERTFR-2020-AVI-051, CERTFR-2020-AVI-157, CERTFR-2020-AVI-415, CERTFR-2020-AVI-474, CERTFR-2020-AVI-482, CERTFR-2020-AVI-623, CVE-2019-11487, DLA-1919-1, DLA-1919-2, openSUSE-SU-2019:1570-1, openSUSE-SU-2019:1571-1, openSUSE-SU-2019:1579-1, RHSA-2019:2703-01, RHSA-2019:2741-01, RHSA-2020:0174-01, RHSA-2020:0834-01, RHSA-2020:0839-01, RHSA-2020:2851-01, RHSA-2020:3230-01, RHSA-2020:3266-01, RHSA-2020:4182-01, SSA:2020-086-01, SUSE-SU-2019:1529-1, SUSE-SU-2019:1530-1, SUSE-SU-2019:1535-1, SUSE-SU-2019:1536-1, SUSE-SU-2019:1550-1, SUSE-SU-2019:1823-1, SUSE-SU-2019:1823-2, SUSE-SU-2019:1852-1, SUSE-SU-2019:1870-1, SUSE-SU-2019:2430-1, USN-4069-1, USN-4069-2, USN-4115-1, USN-4115-2, USN-4118-1, USN-4145-1, VIGILANCE-VUL-29150.

Description of the vulnerability 

An attacker can force the usage of a freed memory area of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
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This cybersecurity threat impacts software or systems such as Debian, Linux, openSUSE Leap, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

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

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

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

Solutions for this threat 

Linux kernel: version 4.4.216.
The version 4.4.216 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.4.216.tar.xz

Linux kernel: patch for page-refs.
A patch is indicated in information sources.

Debian 8: new linux-4.9 packages.
New packages are available:
  Debian 8: linux-4.9 4.9.189-3~deb8u1

openSUSE Leap 15.0: new kernel packages.
New packages are available:
  openSUSE Leap 15.0: kernel 4.12.14-lp150.12.64.1

openSUSE Leap 15.1: new kernel packages.
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.7.1

openSUSE Leap 42.3: new kernel packages.
New packages are available:
  openSUSE Leap 42.3: kernel 4.4.180-102.1

RHEL 6 MRG: new kernel-rt packages.
New packages are available:
  RHEL 6.0-6.10: kernel-rt 3.10.0-693.71.2.rt56.670.el6rt

RHEL 6: new kernel packages.
New packages are available:
  RHEL 6.0-6.10: kernel 2.6.32-754.35.1.el6

RHEL 7.4: new kernel packages.
New packages are available:
  RHEL 7.0-7.8: kernel 3.10.0-693.71.2.el7

RHEL 7.6: new kernel packages.
New packages are available:
  RHEL 7.6: kernel 3.10.0-957.56.1.el7

RHEL 7: new kernel-alt packages.
New packages are available:
  RHEL 7.0-7.7: kernel-alt 4.14.0-115.17.1.el7a

RHEL 7: new kernel packages.
New packages are available:
  RHEL 7.0-7.7: kernel 3.10.0-1062.18.1.el7

RHEL 7: new kernel-rt packages.
New packages are available:
  RHEL 7.0-7.7: kernel-rt 3.10.0-1062.18.1.rt56.1044.el7

RHEL 8.0: new kernel packages.
New packages are available:
  RHEL 8: kernel 4.18.0-80.11.1.el8_0

RHEL 8.0: new kernel-rt packages.
New packages are available:
  RHEL 8: kernel-rt 4.18.0-80.11.1.rt9.156.el8_0

Slackware 14.2: new kernel packages (27/03/2020).
New packages are available:
  Slackware 14.2: kernel 4.4.217-i586-1

SUSE LE 12 SP1: new kernel packages.
New packages are available:
  SUSE LE 12 SP1: kernel 3.12.74-60.64.118.1

SUSE LE 12 SP2: new kernel packages.
New packages are available:
  SUSE LE 12 SP2: kernel 4.4.121-92.117.1

SUSE LE 12 SP3: new kernel packages.
New packages are available:
  SUSE LE 12 SP3: kernel 4.4.180-94.100.1

SUSE LE 12 SP4: new kernel packages (18/06/2019).
New packages are available:
  SUSE LE 12 SP4: kernel 4.12.14-95.19.1

SUSE LE 15: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.22.1

SUSE LE 15 SP1: new kernel packages.
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.4.1

SUSE LE 15 SP1: new kernel-source-rt packages.
New packages are available:
  SUSE LE 15 SP1: kernel-source-rt 4.12.14-14.8.1

Ubuntu 16/18: new linux-image-aws packages.
New packages are available:
  Ubuntu 16.04 LTS: linux-image-aws 4.15.0.1047.47
  Ubuntu 18.04 LTS: linux-image-aws 4.15.0.1047.46

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.62.82
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.62.64

Ubuntu: new linux-image-4.4.0 packages.
New packages are available:
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.165.173

Ubuntu: new linux-image-5.0.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.0.0.23.80
  Ubuntu 19.04: linux-image-generic 5.0.0.21.22

Wind River Linux: solution (21/05/2019).
The solution is indicated in information sources.
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