Canonical announced that a few vulnerabilities had been found in the Linux kernel packages, this time affecting the OMAP4 kernel of the Ubuntu 11.10 (Oneiric Ocelot) operating system.
According to Canonical, several security issues have been fixed in the kernel. A flaw was discovered in the Linux kernel's vhost driver used to accelerate guest networking in KVM-based virtual machines. A privileged guest user could exploit this flaw to crash the host system.
A complete description of the vulnerabilities can be found in the Ubuntu Security Notice.
The security flaws can be fixed if you upgrade your system to the linux-image-3.0.0-1222-omap4 package. 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.