CVE-2015-7835

NameCVE-2015-7835
DescriptionThe mod_l2_entry function in arch/x86/mm.c in Xen 3.4 through 4.6.x does not properly validate level 2 page table entries, which allows local PV guest administrators to gain privileges via a crafted superpage mapping.
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)
ReferencesDSA-3390-1
NVD severityhigh (attack range: local)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
xen (PTS)jessie4.4.1-9+deb8u10fixed
jessie (security)4.4.4lts2-0+deb8u1fixed
buster, stretch4.8.3+xsa267+shim4.10.1+xsa267-1+deb9u9fixed
stretch (security)4.8.4+xsa273+shim4.10.1+xsa273-1+deb9u10fixed
sid4.11.1~pre.20180911.5acdd26fdc+dfsg-5fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
xensource(unstable)4.6.0-1high
xensourcejessie4.4.1-9+deb8u2highDSA-3390-1
xensourcesqueeze(unfixed)end-of-life
xensourcewheezy4.1.4-3+deb7u9highDSA-3390-1

Notes

[squeeze] - xen <end-of-life> (not supported in squeeze-lts)
http://xenbits.xen.org/xsa/advisory-148.html

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