Signedness error in the copy_from_read_buf function in n_tty.c for Linux kernel 2.6.10 and 2.6.11rc1 allows local users to read kernel memory via a negative argument.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10960
http://www.redhat.com/support/errata/RHSA-2005-366.html
http://www.novell.com/linux/security/advisories/2005_18_kernel.html
http://marc.info/?l=full-disclosure&m=110846727602817&w=2
http://marc.info/?l=bugtraq&m=111091402626556&w=2
http://linux.bkbits.net:8080/linux-2.6/cset%40420181322LZmhPTewcCOLkubGwOL3w
http://distro.conectiva.com.br/atualizacoes/index.php?id=a&anuncio=000930