Debian Lenny: DSA-2010-1 Critical KVM Privileges Escalation/DoS Issues

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 distributio...