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SYNTHESIS OF THE VULNERABILITY

A local attacker can use a freed memory area in the AIO
ioctx_alloc() function of the Linux kernel, in order to trigger a
denial of service, and possibly to execute code.

– Impacted products: Linux
– Severity: 1/4
– Creation date: 01/04/2014

DESCRIPTION OF THE VULNERABILITY

The Linux kernel supports AIO (Asynchronous IO) in order to
transfer data efficiently.

However, when an error occurs in the ioctx_alloc() function of the
fs/aio.c file, it frees twice a memory area.

A local attacker can therefore use a freed memory area in the AIO
ioctx_alloc() function of the Linux kernel, in order to trigger a
denial of service, and possibly to execute code.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Linux-kernel-use-after-free-via-AIO-ioctx-alloc-14505