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Vigil@nce - Linux kernel: use after free via vgacon_invert_region

April 2020 by Vigil@nce

This bulletin was written by Vigil@nce : https://vigilance.fr/?langue=2

SYNTHESIS OF THE VULNERABILITY

Impacted products: Linux, openSUSE Leap, Slackware, SLES.

Severity: 2/4.

Consequences: administrator access/rights, denial of service on
server.

Provenance: user shell.

Confidence: confirmed by the editor (5/5).

Creation date: 06/02/2020.

DESCRIPTION OF THE VULNERABILITY

An attacker can force the usage of a freed memory area via
vgacon_invert_region() of the Linux kernel, in order to trigger a
denial of service, and possibly to run code.

ACCESS TO THE FULL VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/Linux-kernel-use-after-free-via-vgacon-invert-region-31538


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