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Vulnerability of Linux kernel: use after free via sctp_sendmsg

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via sctp_sendmsg() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Vulnerable systems: Linux, Ubuntu.
Severity of this threat: 2/4.
Creation date: 21/02/2019.
Références of this weakness: CERTFR-2019-AVI-145, CVE-2019-8956, USN-3930-1, USN-3930-2, VIGILANCE-VUL-28580.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via sctp_sendmsg() 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, Ubuntu.

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

Solutions for this threat 

Linux kernel: version 4.20.8.
The version 4.20.8 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.19.21.
The version 4.19.21 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

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

Ubuntu: new linux-image-4.18.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 4.18.0.17.67
  Ubuntu 18.10: linux-image-generic 4.18.0.17.18

Wind River Linux: solution (21/05/2019).
The solution is indicated in information sources.
Full bulletin, software filtering, emails, fixes, ... (Request your free trial)

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