Security vulnerabilities that were discovered in the Linux kernel packages, this time affecting the Ubuntu 10.04 LTS (Lucid Lynx) operating system, were announced by Canonical.It was discovered that hypervkvpd, which is distributed in the Linux kernel, was not correctly validating the origin on Netlink messages. An untrusted local user could cause a denial of service of Linux guests in Hyper-V virtualization environments.
Also, a race condition flaw has been reported for the Linux ext4 filesystem that could expose stale data.
The security flaws can be fixed if you upgrade your system(s) to the proper version of Linux, detailed in the official announcement.
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.