Some potential local security vulnerabilities were found in the kernel during code audits; these have been fixed in the 2.2.22 kernel.
The Linux kernel handles the basic functions of the operating system. A security code audit of the 2.2 kernel found a number of possible local security vulnerabilities. These vulnerabilities could allow a local user to obtain elevated (root) privileges. Red Hat Linux 6.2 and 7.0 shipped with the 2.2 kernel and are both vulnerable to these issues. All Red Hat Linux users using the 2.2 kernel should upgrade to the errata pacakages contaning the 2.2.22 kernel which are not vulnerable to these issues. Many thanks to Silvio Cesare and Solar Designer for their work in discovering these issues.