The Vigil@nce team watches public vulnerabilities impacting your computers, and then offers security solutions, a vigilance database and tools to fix them.

Vulnerability of Xen, Linux: denial of service via Netback Grant Mapping Errors

Synthesis of the vulnerability 

An attacker, inside a guest system, can trigger a fatal error via Netback Grant Mapping Errors of Xen with Linux, in order to trigger a denial of service on the host system.
Impacted software: XenServer, Debian, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu, Xen.
Severity of this computer vulnerability: 2/4.
Creation date: 04/03/2021.
Références of this announce: CERTFR-2021-AVI-191, CERTFR-2021-AVI-227, CERTFR-2021-AVI-264, CERTFR-2021-AVI-265, CERTFR-2021-AVI-278, CERTFR-2021-AVI-284, CTX306565, CVE-2021-28038, DLA-2586-1, DLA-2610-1, openSUSE-SU-2021:0532-1, SUSE-SU-2021:1175-1, SUSE-SU-2021:1176-1, SUSE-SU-2021:1177-1, SUSE-SU-2021:1210-1, SUSE-SU-2021:1211-1, SUSE-SU-2021:1238-1, USN-4904-1, USN-4911-1, VIGILANCE-VUL-34750, XSA-367.

Description of the vulnerability 

An attacker, inside a guest system, can trigger a fatal error via Netback Grant Mapping Errors of Xen with Linux, in order to trigger a denial of service on the host system.
Full bulletin, software filtering, emails, fixes, ... (Request your free trial)

This computer vulnerability announce impacts software or systems such as XenServer, Debian, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu, Xen.

Our Vigil@nce team determined that the severity of this cybersecurity bulletin 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 threat alert.

Solutions for this threat 

Xen, Linux: patch for Netback Grant Mapping Errors.
A patch is available:
  http://xenbits.xen.org/xsa/xsa367-linux.patch

Citrix Hypervisor, XenServer: patch.
A patch is indicated in information sources.

Debian 9: new linux-4.19 packages.
New packages are available:
  Debian 9: linux-4.19 4.19.181-1~deb9u1

Debian 9: new linux packages.
New packages are available:
  Debian 9: linux 4.9.258-1

openSUSE Leap 15.2: new kernel packages.
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.69.1

SUSE LE 12 SP5: new kernel-azure packages.
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.50.1

SUSE LE 12 SP5: new kernel packages.
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.66.2

SUSE LE 12 SP5: new kernel-rt packages.
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.37.1

SUSE LE 15 SP2: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP2: kernel-azure 5.3.18-18.41.1

SUSE LE 15 SP2: new kernel packages.
New packages are available:
  SUSE LE 15 SP2: kernel 5.3.18-24.61.1

SUSE LE 15 SP2: new kernel-rt packages.
New packages are available:
  SUSE LE 15 SP2: kernel-rt 5.3.18-33.1

Ubuntu 20.04: new linux-image-oem-20.04b packages.
New packages are available:
  Ubuntu 20.04 LTS: linux-image-oem-20.04b 5.10.0.1021.22

Ubuntu: new linux-image-4.4.0 packages (14/04/2021).
New packages are available:
  Ubuntu 14.04 ESM: linux-image-generic-lts-xenial 4.4.0.208.181
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.208.214
Full bulletin, software filtering, emails, fixes, ... (Request your free trial)

Computer vulnerabilities tracking service 

Vigil@nce provides systems vulnerabilities analysis. The Vigil@nce computer vulnerability tracking service alerts your teams of vulnerabilities or threats impacting your information system.