Vigil@nce - Linux kernel: out-of-bounds memory reading via fbcon_get_font
January 2021 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/?langue=2
SYNTHESIS OF THE VULNERABILITY
Impacted products: Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Consequences: data reading, denial of service on server.
Provenance: user shell.
Confidence: confirmed by the editor (5/5).
Creation date: 19/11/2020.
DESCRIPTION OF THE VULNERABILITY
An attacker can force a read at an invalid address via fbcon_get_font() of the Linux kernel, in order to trigger a denial of service, or to obtain sensitive information.
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