Public Date:
756084: CVE-2011-4347 kernel: kvm: device assignment DoS

The MITRE CVE dictionary describes this issue as:

The kvm_vm_ioctl_assign_device function in virt/kvm/assigned-dev.c in the KVM subsystem in the Linux kernel before 3.1.10 does not verify permission to access PCI configuration space and BAR resources, which allows host OS users to assign PCI devices and cause a denial of service (host OS crash) via a KVM_ASSIGN_PCI_DEVICE operation.

Find out more about CVE-2011-4347 from the MITRE CVE dictionary dictionary and NIST NVD.


This issue did not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 4 and Red Hat Enterprise MRG as they did not provide support for the KVM subsystem. This has been addressed in Red Hat Enterprise Linux 6 via A future kvm update in Red Hat Enterprise 5 may address this flaw.

CVSS v2 metrics

NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.

Base Score 4
Base Metrics AV:L/AC:H/Au:N/C:N/I:N/A:C
Access Vector Local
Access Complexity High
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Complete

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux Server EUS (v. 6.1) (kernel) RHSA-2012:1042 2012-06-26
Red Hat Enterprise Linux Virtualization version 5 (kvm) RHSA-2012:0149 2012-02-21
Red Hat Enterprise Linux version 6 (kernel) RHSA-2012:0350 2012-03-06

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 5 kvm Affected
Red Hat Enterprise Linux Server EUS (v. 6.1) kernel Affected
Red Hat Enterprise Linux 4 kernel Not affected


Red Hat would like to thank Sasha Levin for reporting this issue.