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Description of problem:
Xorg server fails to come up on RHEL 6.3 system after applying security updates. Below error is seen in Xorg logs :

 symbol lookup error: /usr/lib64/xorg/modules/libvgahw.so undefined symbol: pci_device_map_legacy

This issue was fixed by updating libpciaccess to 0.13.1.

Version-Release number of selected component (if applicable):
xorg-x11-server-Xorg-1.15.0-25.1.el6_6.x86_64
libpciaccess-0.12.1-1.el6.x86_64

Additional info:

This method is not present in libpciaccess-0.12.1 (RHEL 6.3) but it's present in libpciaccess-0.13.1 (RHEL 6.4).
 
In the spec file for xorg-x11-server packages no specific version of libpciaccess is mentioned as dependency for any xorg related packages, however libpciaccess-devel >= 0.13.1 is mentioned as dependecncy for devel packages :
 
xorg-x11-server (rhel-6.6)> grep libpciaccess *.spec
BuildRequires: libpciaccess-devel >= 0.13.1 openssl-devel byacc flex
Requires: pkgconfig pixman-devel libpciaccess-devel
 
So libpciaccess >= 0.13.1 should be required as dependency for xorg-x11-server-Xorg package.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-0761.html