xattr.c in the ext2 and ext3 file system code for Linux kernel 2.6 does not properly compare the name_index fields when sharing xattr blocks, which could prevent default ACLs from being applied.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10495
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-2802
http://www.securityfocus.com/bid/14793
http://www.securityfocus.com/archive/1/427980/100/0/threaded
http://www.redhat.com/support/errata/RHSA-2006-0144.html
http://www.redhat.com/support/errata/RHSA-2005-514.html
http://www.novell.com/linux/security/advisories/2005_18_kernel.html
http://www.mandriva.com/security/advisories?name=MDKSA-2005:219
http://secunia.com/advisories/19252
http://secunia.com/advisories/18059
http://secunia.com/advisories/18056
http://secunia.com/advisories/17826
http://secunia.com/advisories/17073
http://lists.debian.org/debian-kernel/2005/08/msg00238.html
http://acl.bestbits.at/pipermail/acl-devel/2005-February/001848.html