The ptrace functionality (ptrace.c) in Linux kernel 2.6 before 2.6.14.2, using CLONE_THREAD, does not use the thread group ID to check whether it is attaching to itself, which allows local users to cause a denial of service (crash).Referenceshttp://secunia.com/advisories/17917http://www.kernel.org/git/?p=linux/kernel/git/gregkh/linux-2.6.14.y.git%3Ba=blobdiff%3Bh=fcfc4568b45f3f190ba320b0d5853836921cb8bc%3Bhp=019e04ec065a55d8f28157d3a1f7ba06cafd347f%3Bhb=082d52c56f642d21b771a13221068d40915a1409%3Bf=kernel/ptrace.chttp://www.securityfocus.com/advisories/9806http://secunia.com/advisories/19369http://secunia.com/advisories/18203https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=174075http://www.debian.org/security/2006/dsa-1018http://secunia.com/advisories/19607http://www.securityfocus.com/archive/1/419522/100/0/threadedhttp://www.kernel.org/git/?p=linux/kernel/git/gregkh/linux-2.6.14.y.git%3Ba=commit%3Bh=082d52c56f642d21b771a13221068d40915a1409http://secunia.com/advisories/17761ftp://patches.sgi.com/support/free/security/advisories/20060402-01-Uhttp://www.mandriva.com/security/advisories?name=MDKSA-2006:018http://www.mandriva.com/security/advisories?name=MDKSA-2006:072http://secunia.com/advisories/17918http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.14.2http://www.debian.org/security/2006/dsa-1017http://www.securityfocus.com/bid/15642http://secunia.com/advisories/19374https://usn.ubuntu.com/231-1/http://secunia.com/advisories/17787
