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Vulnerability of Linux kernel: information disclosure via io_uring

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via io_uring of the Linux kernel, in order to obtain sensitive information.
Vulnerable products: Linux, openSUSE Leap, SLES.
Severity of this weakness: 1/4.
Creation date: 30/11/2020.
Références of this bulletin: CERTFR-2021-AVI-021, CERTFR-2021-AVI-035, CVE-2020-29373, PROJ-ZERO-2011, SUSE-SU-2021:0096-1, SUSE-SU-2021:0108-1, SUSE-SU-2021:0117-1, VIGILANCE-VUL-33996.

Description of the vulnerability 

An attacker can bypass access restrictions to data via io_uring of the Linux kernel, in order to obtain sensitive information.
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This weakness alert impacts software or systems such as Linux, openSUSE Leap, SLES.

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

Solutions for this threat 

Linux kernel: version 5.4.24.
The version 5.4.24 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

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

openSUSE Leap 15.2: new kernel packages (15/01/2021).
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.60.1

SUSE LE 15 SP2: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP2: kernel-azure 5.3.18-18.32.1

SUSE LE 15 SP2: new kernel packages (14/01/2021).
New packages are available:
  SUSE LE 15 SP2: kernel 5.3.18-24.46.1

SUSE LE 15 SP2: new kernel-rt packages (13/01/2021).
New packages are available:
  SUSE LE 15 SP2: kernel-rt 5.3.18-22.1
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