Debian Security Advisory

DSA-2010-1 kvm -- privilege escalation/denial of service

Date Reported:
10 Mar 2010
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2010-0298, CVE-2010-0306, CVE-2010-0309, CVE-2010-0419.
More information:

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.

Fixed in:

Debian GNU/Linux 5.0 (lenny)

Architecture-independent component:
Intel IA-32:

MD5 checksums of the listed files are available in the original advisory.