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Vulnerability of Linux kernel: memory corruption via /dev/fdx

Synthesis of the vulnerability 

An attacker can trigger a memory corruption via /dev/fdx of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Impacted software: Linux, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this computer vulnerability: 1/4.
Creation date: 11/03/2021.
Références of this announce: CERTFR-2021-AVI-265, CVE-2021-20261, SUSE-SU-2021:14724-1, USN-4904-1, VIGILANCE-VUL-34828.

Description of the vulnerability 

An attacker can trigger a memory corruption via /dev/fdx of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
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This threat bulletin impacts software or systems such as Linux, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

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

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

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

Solutions for this threat 

Linux kernel: version 4.4.262.
The version 4.4.262 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: patch for /dev/fdx.
A patch is indicated in information sources.

SUSE LE 11 SP4: new kernel packages.
New packages are available:
  SUSE LE 11 SP4: kernel 3.0.101-108.126.1

Ubuntu: new linux-image-4.4.0 packages (14/04/2021).
New packages are available:
  Ubuntu 14.04 ESM: linux-image-generic-lts-xenial 4.4.0.208.181
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.208.214
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