New vulnerabilities were found in the Linux 3.2 and 3.5 kernels, which power the Ubuntu 12.04 LTS (Precise Pangolin) and Ubuntu 12.10 (Quantal Quetzal) operating systems, and Canonical just issued patches for them.
The security flaws can be fixed if you upgrade your system(s) to the linux-image-3.2.0-39 (3.2.0-39.62) package(s) for Ubuntu 12.04 LTS, and the linux-image-3.5.0-26 (3.5.0-26.42) package(s) for Ubuntu 12.10.