The C+ mode offload emulation in the RTL8139 network card device model in QEMU, as used in Xen 4.5.x and earlier, allows remote attackers to read process heap memory via unspecified vectors.
lists.fedoraproject.org/pipermail/package-announce/2015-September/165373.html
lists.fedoraproject.org/pipermail/package-announce/2015-September/167792.html
lists.fedoraproject.org/pipermail/package-announce/2015-September/167820.html
lists.opensuse.org/opensuse-security-announce/2015-08/msg00018.html
lists.opensuse.org/opensuse-security-announce/2015-09/msg00027.html
rhn.redhat.com/errata/RHSA-2015-1674.html
rhn.redhat.com/errata/RHSA-2015-1683.html
rhn.redhat.com/errata/RHSA-2015-1739.html
rhn.redhat.com/errata/RHSA-2015-1740.html
rhn.redhat.com/errata/RHSA-2015-1793.html
rhn.redhat.com/errata/RHSA-2015-1833.html
support.citrix.com/article/CTX201717
www.debian.org/security/2015/dsa-3348
www.debian.org/security/2015/dsa-3349
www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
www.securityfocus.com/bid/76153
www.securitytracker.com/id/1033176
xenbits.xen.org/xsa/advisory-140.html
www.arista.com/en/support/advisories-notices/security-advisories/1180-security-advisory-13