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Vulnerability of libxml2: NULL pointer dereference via xmlValidBuildAContentModel

Synthesis of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via xmlValidBuildAContentModel() of libxml2, in order to trigger a denial of service.
Impacted products: Debian, Fedora, libxml, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES.
Severity of this bulletin: 1/4.
Creation date: 10/05/2021.
Références of this threat: CVE-2021-3537, DLA-2653-1, FEDORA-2021-b950000d2b, FEDORA-2021-e3ed1ba38b, openSUSE-SU-2021:0764-1, RHBUG-1956524, SUSE-SU-2021:14729-1, SUSE-SU-2021:1654-1, SUSE-SU-2021:1658-1, VIGILANCE-VUL-35289.

Description of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via xmlValidBuildAContentModel() of libxml2, in order to trigger a denial of service.
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This computer vulnerability bulletin impacts software or systems such as Debian, Fedora, libxml, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES.

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

The trust level is of type confirmed by the editor, with an origin of document.

An attacker with a expert ability can exploit this threat note.

Solutions for this threat 

Debian 9: new libxml2 packages.
New packages are available:
  Debian 9: libxml2 2.9.4+dfsg1-2.2+deb9u4

Fedora 33: new libxml2 packages.
New packages are available:
  Fedora 33: libxml2 2.9.12-4.fc33

Fedora 34: new libxml2 packages.
New packages are available:
  Fedora 34: libxml2 2.9.10-12.fc34

openSUSE Leap 15.2: new libxml2 packages (24/05/2021).
New packages are available:
  openSUSE Leap 15.2: libxml2 2-2.9.7-lp152.10.12.1

SUSE LE 11 SP3-4: new libxml2 packages.
New packages are available:
  SUSE LE 11 SP3: libxml2 2.7.6-0.77.36.1
  SUSE LE 11 SP4: libxml2 2.7.6-0.77.36.1

SUSE LE 12 SP2-5: new libxml2 packages.
New packages are available:
  SUSE LE 12 SP2: libxml2 2.9.4-46.43.1
  SUSE LE 12 SP3: libxml2 2.9.4-46.43.1
  SUSE LE 12 SP4: libxml2 2.9.4-46.43.1
  SUSE LE 12 SP5: libxml2 2.9.4-46.43.1

SUSE LE 15 SP2-3: new libxml2 packages (19/05/2021).
New packages are available:
  SUSE LE 15 SP2: libxml2 2.9.7-3.34.1
  SUSE LE 15 SP3: libxml2 2.9.7-3.34.1
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