Bug 286104 (CVE-2009-3290)

Summary:	Kernel: KVM: x86: Disallow hypercalls for guest callers in rings > 0 (CVE-2009-3290)
Product:	Gentoo Security	Reporter:	Alex Legler (RETIRED) <a3li>
Component:	Kernel	Assignee:	Gentoo Security <security>
Status:	RESOLVED FIXED
Severity:	normal	CC:	hardened-kernel+disabled, kernel
Priority:	High
Version:	unspecified
Hardware:	All
OS:	Linux
URL:	http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=07708c4af1346ab1521b26a202f438366b7bcffd
Whiteboard:	[linux <2.6.31]
Package list:		Runtime testing required:	---

Description Alex Legler (RETIRED) archtester

2009-09-23 15:36:16 UTC

CVE-2009-3290 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2009-3290):
  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 guest kernel memory via
  unspecified "random addresses."