Xen 4.4.x, when running on an ARM system, does not properly context switch the CNTKCTL_EL1 register, which allows local guest users to modify the hardware timers and cause a denial of service (crash) via unspecified vectors.
CVSS Severity (version 2.0):
Impact Subscore: 7.8
Exploitability Subscore: 5.1
CVSS Version 2 Metrics:
Access Vector: Local network exploitable
Access Complexity: Low
Authentication: Required to exploit
Impact Type: Allows unauthorized modification; Allows disruption of service
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Advisory; Patch Information
[oss-security] 20140430 Re: Xen Security Advisory 91 - Hardware timer context is not properly context switched on ARM
[oss-security] 20140430 Xen Security Advisory 91 - Hardware timer context is not properly context switched on ARM
Vulnerable software and versions