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


Synthesis of the vulnerability 


An attacker can trigger a memory corruption via expand_downwards() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Impacted systems: Linux.
Severity of this alert: 2/4.
Creation date: 14/09/2020.
Références of this alert: PROJ-ZERO-2056, VIGILANCE-VUL-33317.

Description of the vulnerability 


An attacker can trigger a memory corruption via expand_downwards() of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
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This threat note impacts software or systems such as Linux.

Our Vigil@nce team determined that the severity of this cybersecurity note 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 vulnerability note.

Solutions for this threat 


Linux kernel: version 5.7.11.
The version 5.7.11 is fixed:
  http://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.54.
The version 5.4.54 is fixed:
  http://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: patch for expand_downwards.
A patch is indicated in information sources.
Full bulletin, software filtering, emails, fixes, … (Request your free trial)

Computer vulnerabilities tracking service 


Vigil@nce provides an applications vulnerabilities announce. The Vigil@nce team tracks computer vulnerabilities impacting systems and applications.





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