Use-after-free vulnerability in the xacct_add_tsk function in kernel/tsacct.c in the Linux kernel before 2.6.19 allows local users to obtain potentially sensitive information from kernel memory or cause a denial of service (system crash) via a taskstats TASKSTATS_CMD_ATTR_PID command.
https://bugzilla.redhat.com/show_bug.cgi?id=849722
http://www.securitytracker.com/id?1027602
http://www.securityfocus.com/bid/55144
http://www.openwall.com/lists/oss-security/2012/08/20/12
http://secunia.com/advisories/50811
http://rhn.redhat.com/errata/RHSA-2012-1323.html
http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.19