The netback driver in Xen, when using certain Linux versions that do not allow sleeping in softirq context, allows local guest administrators to cause a denial of service ("scheduling while atomic" error and host crash) via a malformed packet, which causes a mutex to be taken when trying to disable the interface.
CVSS Severity (version 2.0):
Impact Subscore: 6.9
Exploitability Subscore: 2.7
CVSS Version 2 Metrics:
Access Vector: Locally exploitable
Access Complexity: Medium
Authentication: Required to exploit
Impact Type: Allows disruption of service
References to Advisories, Solutions, and Tools
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[oss-security] 20140324 Xen Security Advisory 90 - Linux netback crash trying to disable due to malformed packet
[oss-security] 20140324 Re: Xen Security Advisory 90 - Linux netback crash trying to disable due to malformed packet
Advisory; Patch Information
Vulnerable software and versions