The kernel has been updated to fix a regression introduced in a patch
A security vulnerability that was discovered in the Linux kernel, affecting the Ubuntu 12.10 (Quantal Quetzal) operating system, has been announced by Canonical.USN-1699-1 fixed vulnerabilities in the Linux kernel, but it also introduced a regression. Due to an unrelated regression, inotify/fanotify stopped working after upgrading. This update fixes the problem.
The security flaws can be fixed if you upgrade your system(s) to the linux-image-3.5.0-23 (3.5.0-23.35).
Don't forget to reboot your computer after the upgrade!
ATTENTION: Due to an unavoidable ABI change, the kernel packages have a new version number, which will force you to reinstall and recompile all third-party kernel modules you might have installed. Moreover, if you use the linux-restricted-modules package, you have to update it as well to get modules that work with the new Linux kernel version.