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Vigil@nce - Linux kernel: information disclosure via Segmentation Zerocopy

March 2014 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

A local attacker can use fragmented data, in order to obtain
memory areas from the Linux kernel memory.

 Impacted products: Linux
 Severity: 1/4
 Creation date: 11/03/2014

DESCRIPTION OF THE VULNERABILITY

A SKB (Socket Kernel Buffer) can store fragmented network data.
The Zerocopy feature is used to access to data without performing
a copy of the memory area.

However, if a fragmented SKB comes from vhost-net with a Zerocopy,
a buffer storing data can be freed, and then returned to the user
space.

A local attacker can therefore use fragmented data, in order to
obtain memory areas from the Linux kernel memory.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Linux-kernel-information-disclosure-via-Segmentation-Zerocopy-14391


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