CVE-2011-2521

CVE-2011-2521 describes a denial-of-service vulnerability in the Linux kernel's Performance Events subsystem, specifically affecting versions prior to 2.6.39. A local attacker can trigger a system panic by manipulating counter values through the perf program due to improper calculations in the x86_assign_hw_event function. This vulnerability has a CVSS score of 4.9, indicating low attack complexity and local access requirements, with the primary impact being system availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.