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Vulnerability of QEMU: out-of-bounds memory reading via ati-vga ati_2d_blt

Synthesis of the vulnerability 

An attacker, inside a guest system, can force a read at an invalid address via ati-vga ati_2d_blt() of QEMU, in order to trigger a denial of service, or to obtain sensitive information on the host system.
Vulnerable software: openSUSE Leap, QEMU, SLES, Ubuntu.
Severity of this announce: 2/4.
Creation date: 03/11/2020.
Références of this computer vulnerability: CVE-2020-27616, openSUSE-SU-2021:0600-1, SUSE-SU-2021:1243-1, USN-4650-1, VIGILANCE-VUL-33775.

Description of the vulnerability 

An attacker, inside a guest system, can force a read at an invalid address via ati-vga ati_2d_blt() of QEMU, in order to trigger a denial of service, or to obtain sensitive information on the host system.
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This computer threat bulletin impacts software or systems such as openSUSE Leap, QEMU, SLES, Ubuntu.

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

Solutions for this threat 

QEMU: patch for ati-vga ati_2d_blt.
A patch is indicated in information sources.

openSUSE Leap 15.2: new qemu packages.
New packages are available:
  openSUSE Leap 15.2: qemu 4.2.1-lp152.9.12.1

SUSE LE 15 SP2: new qemu packages.
New packages are available:
  SUSE LE 15 SP2: qemu 4.2.1-11.16.3

Ubuntu: new qemu packages.
New packages are available:
  Ubuntu 16.04 LTS: qemu 1:2.5+dfsg-5ubuntu10.48
  Ubuntu 18.04 LTS: qemu 1:2.11+dfsg-1ubuntu7.34
  Ubuntu 20.04 LTS: qemu 1:4.2-3ubuntu6.10
  Ubuntu 20.10: qemu 1:5.0-5ubuntu9.2
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