The MITRE CVE dictionary describes this issue as:
The cifs_lookup function in fs/cifs/dir.c in the Linux kernel before 3.2.10 allows local users to cause a denial of service (OOPS) via attempted access to a special file, as demonstrated by a FIFO.
Find out more about CVE-2012-1090 from the
MITRE CVE dictionary dictionary and
This issue did not affect the Linux kernel as shipped with Red Hat Enterprise
Linux 4 and 5 as they did not backport the commit
a6ce4932fbdbcd8f8e8c6df76812014351c32892 that introduced this issue. This issue did not affect the Linux kernel as shipped with Red Hat Enterprise MRG 2. This has been addressed in Red Hat Enterprise Linux 6 via https://rhn.redhat.com/errata/RHSA-2012-0481.html.