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Vulnerability of Linux kernel: privilege escalation via IORING_OP_SENDMSG

Synthesis of the vulnerability 

An attacker can bypass restrictions via IORING_OP_SENDMSG of the Linux kernel, in order to escalate his privileges.
Impacted systems: Linux, Ubuntu.
Severity of this alert: 2/4.
Creation date: 18/12/2019.
Références of this alert: CERTFR-2020-AVI-096, CVE-2019-19241, USN-4284-1, VIGILANCE-VUL-31181.

Description of the vulnerability 

An attacker can bypass restrictions via IORING_OP_SENDMSG of the Linux kernel, in order to escalate his privileges.
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This threat impacts software or systems such as Linux, Ubuntu.

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

Solutions for this threat 

Linux kernel: version 5.4.2.
The version 5.4.2 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.3.15.
The version 5.3.15 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

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

Ubuntu: new linux-image-5.3.0 packages (19/02/2020).
New packages are available:
  Ubuntu 19.10: linux-image-generic 5.3.0.40.34
  Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.3.0.40.97

Wind River Linux: version 10.19.45.3.
The version 10.19.45.3 is fixed:
  https://support2.windriver.com/
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