CVE-2004-2536

CVE-2004-2536 describes a privilege escalation vulnerability in Linux kernel versions 2.6 through 2.6.5, specifically within the exit_thread function. This flaw allows a process that obtained IO access permissions via ioperm, but failed to relinquish them upon exit, to leave per-TSS io_bitmap pointers accessible to other processes. This could lead to unauthorized memory access and potential privilege escalation. With a CVSS score of 7.5, it represents a high-severity vulnerability with low attack complexity and potential for confidentiality, integrity, and availability impacts. Despite its age and high community discussion, there is no evidence of active exploitation, nor are there publicly available exploits in Metasploit, Nuclei, or ExploitDB.