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Vigil@nce: Linux kernel, denial of service of tvaudio

October 2008 by Vigil@nce

SYNTHESIS

A local attacker can stop the system by using the tvaudio driver.

Gravity: 1/4

Consequences: denial of service of computer

Provenance: user shell

Means of attack: no proof of concept, no attack

Ability of attacker: expert (4/4)

Confidence: confirmed by the editor (5/5)

Diffusion of the vulnerable configuration: high (3/3)

Creation date: 23/10/2008

IMPACTED PRODUCTS

 Linux kernel

DESCRIPTION

The drivers/media/video/tvaudio.c file implements the driver for
i2c chips handling TV sound. Unsupported features have a NULL
function pointer.

The VIDIOC_S_FREQUENCY changes the frequency of the radio tuner.
This ioctl does not check if the chip support the desc->setmode()
function before calling it. A NULL pointer is thus dereferenced,
which stops the kernel.

A local attacker can therefore create a denial of service.

CHARACTERISTICS

Identifiers: VIGILANCE-VUL-8199

http://vigilance.aql.fr/vulnerability/8199


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