The user_update function in security/keys/user_defined.c in the Linux kernel 2.6 allows local users to cause a denial of service (NULL pointer dereference and kernel oops) via vectors related to a user-defined key and βupdating a negative key into a fully instantiated key.β
marc.info/?l=bugtraq&m=139447903326211&w=2
secunia.com/advisories/47754
www.openwall.com/lists/oss-security/2011/11/21/19
www.openwall.com/lists/oss-security/2011/11/22/5
www.openwall.com/lists/oss-security/2011/11/22/6
www.securityfocus.com/bid/50755
www.ubuntu.com/usn/USN-1324-1
www.ubuntu.com/usn/USN-1328-1
www.ubuntu.com/usn/USN-1344-1
bugzilla.redhat.com/show_bug.cgi?id=751297
lkml.org/lkml/2011/11/15/363