Integer signedness error in the NE2000 emulator in QEMU 0.8.2 as used in Xen and possibly other products allows local users to trigger a heap-based buffer overflow via certain register values that bypass sanity checks aka QEMU NE2000 \receive\ integer signedness error. NOTE: this identifier was inadvertently used by some sources to cover multiple issues that were labeled \NE2000 network driver and the socket code \ but separate identifiers have been created for the individual vulnerabilities since there are sometimes different fixes; see CVE-2007-5729 and CVE-2007-5730.