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Vigil@nce - Linux kernel: denial of service via GRO

April 2011 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

An attacker can send a packet with a malicious VLAN, in order to
stop the kernel if GRO is enabled.

Severity: 2/4

Creation date: 28/03/2011

IMPACTED PRODUCTS

 Linux kernel

DESCRIPTION OF THE VULNERABILITY

The GRO (Generic Receive Offload) feature groups several received
packets in a same SKB (Socket Kernel Buffer), in order to reduce
the number of processing.

When a packet processed with GRO is received with an unknown VLAN
number, the skb->dev (device) field is set to NULL.

The memory area used by SKB is reused to process the following
packets. However, the skb->dev field is not reinitialized between
two usages. The second usage thus dereferences a NULL pointer.

An attacker can therefore send a packet with a malicious VLAN, in
order to stop the kernel if GRO is enabled.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Linux-kernel-denial-of-service-via-GRO-10497


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