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 Linux kernel: privilege escalation via Signal Sending

Synthesis of the vulnerability 

An attacker can bypass restrictions via Signal Sending of the Linux kernel, in order to escalate his privileges.
Impacted products: Tivoli Storage Manager, Linux, RHEL, Ubuntu.
Severity of this bulletin: 1/4.
Creation date: 25/02/2021.
Références of this threat: 6445699, CERTFR-2021-AVI-149, CVE-2020-35508, RHBUG-1902724, RHSA-2021:1578-01, RHSA-2021:1739-01, USN-4751-1, USN-4752-1, VIGILANCE-VUL-34683.

Description of the vulnerability 

An attacker can bypass restrictions via Signal Sending of the Linux kernel, in order to escalate his privileges.
Full bulletin, software filtering, emails, fixes, ... (Request your free trial)

This weakness bulletin impacts software or systems such as Tivoli Storage Manager, Linux, RHEL, Ubuntu.

Our Vigil@nce team determined that the severity of this computer 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 vulnerability announce.

Solutions for this threat 

Linux kernel: version 5.9.7.
The version 5.9.7 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.76.
The version 5.4.76 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.156.
The version 4.19.156 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.205.
The version 4.14.205 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.242.
The version 4.9.242 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.242.
The version 4.4.242 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: patch for Signal Sending.
A patch is indicated in information sources.

IBM Spectrum Protect Plus: solution for Linux.
The solution is indicated in information sources.

RHEL 8: new kernel packages.
New packages are available:
  RHEL 8.0-8.3: kernel 4.18.0-305.el8

RHEL 8: new kernel-rt packages.
New packages are available:
  RHEL 8.0-8.3: kernel-rt 4.18.0-305.rt7.72.el8

Ubuntu 20.04: new linux-image-5.6.0 packages.
New packages are available:
  Ubuntu 20.04 LTS: linux-image-oem-20.04 5.6.0.1048.44

Ubuntu 20: new linux-image-5.8.0 packages.
New packages are available:
  Ubuntu 20.04 LTS: linux-image-generic-hwe-20.04 5.8.0.44.50~20.04.30
  Ubuntu 20.10: linux-image-generic 5.8.0.44.49
Full bulletin, software filtering, emails, fixes, ... (Request your free trial)

Computer vulnerabilities tracking service 

Vigil@nce provides a computers vulnerabilities patch. The Vigil@nce security watch publishes vulnerability bulletins about threats impacting the information system.