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Vulnerability of Linux kernel: information disclosure via ARM64/KVM Debug Registers

Synthesis of the vulnerability 

An attacker, inside a guest system, can bypass access restrictions to data via ARM64/KVM Debug Registers of the Linux kernel, in order to obtain sensitive information on the host system.
Vulnerable systems: Fedora, Linux.
Severity of this threat: 1/4.
Creation date: 31/01/2020.
Références of this weakness: FEDORA-2020-2a5cdd665c, FEDORA-2020-f884f9dd7d, VIGILANCE-VUL-31478.

Description of the vulnerability 

An attacker, inside a guest system, can bypass access restrictions to data via ARM64/KVM Debug Registers of the Linux kernel, in order to obtain sensitive information on the host system.
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This security alert impacts software or systems such as Fedora, Linux.

Our Vigil@nce team determined that the severity of this security weakness 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 security announce.

Solutions for this threat 

Linux kernel: version 5.5.1.
The version 5.5.1 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.17.
The version 5.4.17 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.101.
The version 4.19.101 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: patch for ARM64/KVM Debug Registers.
A patch is indicated in information sources.

Fedora: new kernel-headers packages.
New packages are available:
  Fedora 30: kernel-headers 5.4.18-100.fc30
  Fedora 31: kernel-headers 5.4.18-200.fc31

Fedora: new kernel packages.
New packages are available:
  Fedora 30: kernel 5.4.19-100.fc30
  Fedora 31: kernel 5.4.19-200.fc31
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