kvm - several vulnerabilities

Several local vulnerabilities have been discovered in kvm, a full
virtualization system. The Common Vulnerabilities and Exposures project
identifies the following problems:

• CVE-2010-0298
  CVE-2010-0306
  Gleb Natapov discovered issues in the KVM subsystem where missing
  permission checks (CPL/IOPL) permit a user in a guest system to
  denial of service a guest (system crash) or gain escalated
  privileges with the guest.
• CVE-2010-0309
  Marcelo Tosatti fixed an issue in the PIT emulation code in the
  KVM subsystem that allows privileged users in a guest domain to
  cause a denial of service (crash) of the host system.
• CVE-2010-0419
  Paolo Bonzini found a bug in KVM that can be used to bypass proper
  permission checking while loading segment selectors. This
  potentially allows privileged guest users to execute privileged
  instructions on the host system.

For the stable distribution (lenny), this problem has been fixed in
version 72+dfsg-5~lenny5.

For the testing distribution (squeeze), and the unstable distribution (sid),
these problems will be addressed within the linux-2.6 package.

We recommend that you upgrade your kvm package.