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Vigil@nce - Linux kernel: denial of service via xsaves/xrstors
March 2015 by Vigil@nce
This bulletin was written by Vigil@nce : http://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
An attacker can use xsaves/xrstors on the Linux kernel, in order
to trigger a denial of service.
Impacted products: Linux
Severity: 1/4
Creation date: 18/03/2015
DESCRIPTION OF THE VULNERABILITY
The XSAVES instruction saves the state of the Processor Extended
States Supervisor. The XRSTORS instruction restores it.
However, a local attacker can use these instructions to trigger a
fatal error in the kernel, due to an invalid label name.
An attacker can therefore use xsaves/xrstors on the Linux kernel,
in order to trigger a denial of service.
ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
http://vigilance.fr/vulnerability/Linux-kernel-denial-of-service-via-xsaves-xrstors-16413
