The AVG Antivirus core kernel mode service driver (avg7core.sys) provides functionality that under a default install allows an unprivileged user to write arbitrary data to arbitrary addresses. This issue has been verified as affecting AVG Free 7.5.446 and AVG Antivirus 7.5.448. The version of avg7core.sys in question is 7.5.0.444.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/57656/avg-kernel.txt
Source: https://packetstormsecurity.com/files/57656/avg-kernel.txt.html