From oss-security mailing list at $URL: Commit ef14f0c1578dce4b688726eb2603e50b62d6665a introduced an integer overflow in the ACL handling code, which could further lead to heap-based buffer overflow via a crafted filesystem. Upstream commits: http://git.kernel.org/linus/fa8b18edd752a8b4e9d1ee2cd615b82c93cf8bba http://git.kernel.org/linus/093019cf1b18dd31b2c3b77acce4e000e2cbc9ce Both commits are needed to fix the vulnerability. The vulnerability seems to first appear in 2.6.32-rc1. 3.2 contains only the first commit.
Secunia advisory: https://secunia.com/advisories/47488/
There are no longer any 2.x or <3.1.9 kernels available in the repository with the exception of sys-kernel/xbox-sources which is unsupported by security.