CVE-2011-4622

CVE-2011-4622 describes a denial-of-service vulnerability in KVM 83 and potentially other versions, specifically within the create_pit_timer function in arch/x86/kvm/i8254.c. This flaw occurs when the Programmable Interval Timer (PIT) interrupt requests are mishandled due to the absence of a virtual interrupt controller, allowing local users to trigger a NULL pointer dereference by starting a timer. With a CVSS score of 4.9 (AV:L/AC:L/Au:N/C:N/I:N/A:C), this vulnerability has a low attack complexity and requires local access, leading to a complete loss of availability. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage, indicating a low current threat profile.