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Vulnerability of Linux, Xen: memory leak via Blkback Driver

Synthesis of the vulnerability 

An attacker, inside a guest system, can create a memory leak via Blkback Driver of Linux with Xen, in order to trigger a denial of service on the host system.
Impacted software: XenServer, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Xen.
Severity of this computer vulnerability: 1/4.
Creation date: 30/03/2021.
Références of this announce: CERTFR-2021-AVI-227, CERTFR-2021-AVI-228, CERTFR-2021-AVI-264, CERTFR-2021-AVI-278, CERTFR-2021-AVI-284, CERTFR-2021-AVI-323, CTX306565, CVE-2021-28688, 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, SUSE-SU-2021:1341-1, VIGILANCE-VUL-34966, XSA-371.

Description of the vulnerability 

An attacker, inside a guest system, can create a memory leak via Blkback Driver of Linux with Xen, in order to trigger a denial of service on the host system.
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This security threat impacts software or systems such as XenServer, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Xen.

Our Vigil@nce team determined that the severity of this computer weakness note 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 computer threat alert.

Solutions for this threat 

Linux kernel: version 5.11.11.
The version 5.11.11 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.10.27.
The version 5.10.27 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.109.
The version 5.4.109 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.184.
The version 4.19.184 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.228.
The version 4.14.228 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.264.
The version 4.9.264 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.264.
The version 4.4.264 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux, Xen: patch for Blkback Driver.
A patch is available:
  http://xenbits.xen.org/xsa/xsa371-linux.patch

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

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 SP3: new kgraft-patch packages.
New packages are available:
  SUSE LE 12 SP3: kgraft-patch 4_4_180-94_141-default-3-2.2

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
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