National Cyber-Alert System
Vulnerability Summary for CVE-2009-3290
Original release date:09/22/2009
Last revised:10/01/2009
Source:
US-CERT/NIST
Overview
The kvm_emulate_hypercall function in arch/x86/kvm/x86.c in KVM in the Linux kernel 2.6.25-rc1, and other versions before 2.6.31, when running on x86 systems, does not prevent access to MMU hypercalls from ring 0, which allows local guest OS users to cause a denial of service (guest kernel crash) and read or write guest kernel memory via unspecified "random addresses."
Impact
CVSS Severity (version 2.0):
Impact Subscore:
10.0
Exploitability Subscore:
3.9
CVSS Version 2 Metrics:
Access Vector: Locally exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type:Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service
Official Statement from Red Hat (09/22/2009)
Red Hat is aware of this issue and is tracking it via the following bug: https://bugzilla.redhat.com/CVE-2009-3290
This issue did not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 3, 4, and Red Hat Enterprise MRG as KVM (Kernel-based Virtual Machine) is only supported in Red Hat Enterprise Linux 5. A future kernel update in Red Hat Enterprise Linux 5 will address this flaw.
References to Advisories, Solutions, and Tools
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External Source: CONFIRM
Name: http://patchwork.kernel.org/patch/38926/
Type: Patch Information
External Source: CONFIRM
Name: https://bugzilla.redhat.com/show_bug.cgi?id=524124
External Source: REDHAT
Name: RHSA-2009:1465
External Source: MLIST
Name: [oss-security] 20090922 Re: CVE request: kernel: KVM: x86: Disallow hypercalls for guest callers in rings > 0
External Source: MLIST
Name: [oss-security] 20090921 Re: CVE request: kernel: KVM: x86: Disallow hypercalls for guest callers in rings > 0
External Source: MLIST
Name: [oss-security] 20090918 CVE request: kernel: KVM: x86: Disallow hypercalls for guest callers in rings > 0
External Source: CONFIRM
Name: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=07708c4af1346ab1521b26a202f438366b7bcffd
