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Vulnerability of QEMU: assertion error via net_tx_pkt_add_raw_fragment

Synthesis of the vulnerability 

An attacker, inside a guest system, can force an assertion error via net_tx_pkt_add_raw_fragment() of QEMU, in order to trigger a denial of service on the host system.
Impacted software: Debian, QEMU, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this computer vulnerability: 1/4.
Creation date: 10/08/2020.
Références of this announce: CVE-2020-16092, DLA-2373-1, DSA-4760-1, SUSE-SU-2020:2743-1, USN-4467-1, VIGILANCE-VUL-33040.

Description of the vulnerability 

An attacker, inside a guest system, can force an assertion error via net_tx_pkt_add_raw_fragment() of QEMU, in order to trigger a denial of service on the host system.
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This cybersecurity weakness impacts software or systems such as Debian, QEMU, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

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

Solutions for this threat 

QEMU: patch for net_tx_pkt_add_raw_fragment.
A patch is indicated in information sources.

Debian 10: new qemu packages.
New packages are available:
  Debian 10: qemu 1:3.1+dfsg-8+deb10u8

Debian 9: new qemu packages.
New packages are available:
  Debian 9: qemu 1:2.8+dfsg-6+deb9u11

SUSE LE 12 SP5: new qemu packages.
New packages are available:
  SUSE LE 12 SP5: qemu 3.1.1.1-45.1

Ubuntu: new qemu packages.
New packages are available:
  Ubuntu 20.04 LTS: qemu 1:4.2-3ubuntu6.4
  Ubuntu 18.04 LTS: qemu 1:2.11+dfsg-1ubuntu7.31
  Ubuntu 16.04 LTS: qemu 1:2.5+dfsg-5ubuntu10.45
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