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A race condition exists in the ptrace and utrace support of the Linux kernel versions 2.6.9 through 2.6.25, particularly as used in Red Hat Enterprise Linux 4. Local users can exploit this by issuing a long series of PTRACE_ATTACH calls to another user's process, triggering a conflict between utrace_detach and report_quiescent. This is due to a late ptrace_may_attach() check and a race around the &dead_engine_ops setting, leading to a kernel oops. This vulnerability is distinct from CVE-2007-0771 and CVE-2008-1514, and may only affect kernel versions prior to 2.6.16.x.
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