Some vulnerabilities have been reported in KVM, which can be exploited by malicious, local users to bypass certain security restrictions or cause a DoS (Denial of Service).
1) The block device backends do not properly check a guest's read or write attempts, which can be exploited out of a KVM guest system to e.g. crash the KVM host or potentially escape the virtualisation jail by writing into arbitrary host memory.
Note: Successful exploitation requires privileges to send specially crafted read or write requests to the block device backends.
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Subject: KVM Multiple Vulnerabilities
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