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Vulnerability of Linux kernel: information disclosure via retrieve_ptr_limit

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via retrieve_ptr_limit() of the Linux kernel, in order to obtain sensitive information.
Vulnerable systems: Debian, Fedora, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this threat: 2/4.
Creation date: 19/03/2021.
Références of this weakness: CERTFR-2021-AVI-217, CERTFR-2021-AVI-220, CERTFR-2021-AVI-264, CERTFR-2021-AVI-278, CERTFR-2021-AVI-284, CERTFR-2021-AVI-392, CERTFR-2021-AVI-469, CVE-2020-27171, DLA-2610-1, FEDORA-2021-e49da8a226, openSUSE-SU-2021:0532-1, openSUSE-SU-2021:0758-1, SUSE-SU-2021:1175-1, SUSE-SU-2021:1176-1, SUSE-SU-2021:1177-1, SUSE-SU-2021:1210-1, SUSE-SU-2021:1211-1, SUSE-SU-2021:1238-1, SUSE-SU-2021:1573-1, SUSE-SU-2021:1596-1, SUSE-SU-2021:1624-1, SUSE-SU-2021:1975-1, SUSE-SU-2021:1977-1, USN-4887-1, USN-4890-1, VIGILANCE-VUL-34892.

Description of the vulnerability 

An attacker can bypass access restrictions to data via retrieve_ptr_limit() of the Linux kernel, in order to obtain sensitive information.
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This vulnerability alert impacts software or systems such as Debian, Fedora, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this computer weakness alert is medium.

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 computer vulnerability.

Solutions for this threat 

Linux kernel: version 5.11.8.
The version 5.11.8 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.10.25.
The version 5.10.25 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.107.
The version 5.4.107 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.182.
The version 4.19.182 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.227.
The version 4.14.227 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: patch for retrieve_ptr_limit.
A patch is indicated in information sources.

Debian 9: new linux-4.19 packages.
New packages are available:
  Debian 9: linux-4.19 4.19.181-1~deb9u1

Fedora 33: new kernel packages.
New packages are available:
  Fedora 33: kernel 5.11.8-200.fc33

openSUSE Leap 15.2: new kernel packages.
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.69.1

openSUSE Leap 15.2: new kernel-rt packages.
New packages are available:
  openSUSE Leap 15.2: kernel-rt 5.3.18-lp152.3.8.1

SUSE LE 12 SP4: new kernel packages.
New packages are available:
  SUSE LE 12 SP4: kernel 4.12.14-95.74.1

SUSE LE 12 SP5: new kernel-azure packages.
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.50.1

SUSE LE 12 SP5: new kernel packages (16/04/2021).
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.66.2

SUSE LE 12 SP5: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.37.1

SUSE LE 15 RTM: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.72.1

SUSE LE 15 SP1: new kernel packages (18/05/2021).
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.89.2

SUSE LE 15 SP2: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP2: kernel-azure 5.3.18-18.41.1

SUSE LE 15 SP2: new kernel packages.
New packages are available:
  SUSE LE 15 SP2: kernel 5.3.18-24.61.1

SUSE LE 15 SP2: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP2: kernel-rt 5.3.18-33.1

SUSE LE 15 SP3: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP3: kernel-azure 5.3.18-38.3.1

SUSE LE 15 SP3: new kernel packages.
New packages are available:
  SUSE LE 15 SP3: kernel 5.3.18-59.5.2

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.140.135
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.140.127

Ubuntu: new linux-image packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.4.0.70.78~18.04.63
  Ubuntu 20.04 LTS: linux-image-generic 5.4.0.70.73
  Ubuntu 20.10: linux-image-generic 5.8.0.48.53
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