DescriptionThe do_hvm_op function in xen/arch/x86/hvm/hvm.c in Xen 4.2.x on the x86_32 platform does not prevent HVM_PARAM_NESTEDHVM (aka nested virtualization) operations, which allows guest OS users to cause a denial of service (long-duration page mappings and host OS crash) by leveraging administrative access to an HVM guest in a domain with a large number of VCPUs.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium (attack range: remote)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
xen (PTS)wheezy4.1.4-3+deb7u9fixed
wheezy (security)4.1.6.lts1-13fixed
jessie (security), jessie4.4.1-9+deb8u10fixed
buster, sid, stretch (security), stretch4.8.3+comet2+shim4.10.0+comet3-1+deb9u5fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
xensource(unstable)(not affected)


- xen <not-affected> (Only applies to Xen 4.2, which is only available in experimental)

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