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Vulnerability of Linux kernel: buffer overflow via psi_write

Synthesis of the vulnerability 

An attacker can trigger a buffer overflow via psi_write() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Impacted systems: Android OS, Linux, openSUSE Leap.
Severity of this alert: 2/4.
Creation date: 08/02/2021.
Références of this alert: 1171374, CVE-2020-0110, openSUSE-SU-2021:0242-1, VIGILANCE-VUL-34505.

Description of the vulnerability 

An attacker can trigger a buffer overflow via psi_write() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
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This threat note impacts software or systems such as Android OS, Linux, openSUSE Leap.

Our Vigil@nce team determined that the severity of this cybersecurity note 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 vulnerability note.

Solutions for this threat 

Linux kernel: version 5.5.7.
The version 5.5.7 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.23.
The version 5.4.23 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

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

Google Android/Pixel: patch for May 2020.
A patch is indicated in information sources.

openSUSE Leap 15.2: new kernel-rt packages.
New packages are available:
  openSUSE Leap 15.2: kernel-rt 5.3.18-lp152.3.5.1
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