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Newly Discovered Kernel Vulnerabilities Affect All Ubuntu Users

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Security

Yesterday, November 27th, the Ubuntu developers discovered yet another security issue (actually, more than one) in the Linux kernel packages. These vulnerabilities affect the following Ubuntu distributions: 6.06 LTS, 7.10, 8.04 LTS and 8.10 (also applies to Kubuntu, Edubuntu and Xubuntu). The truth is that there are exactly nine (yes, 9) security issues (see below for details), therefore, it is strongly recommended to update your system as soon as possible!

The Ubuntu developers discovered that:

1. The Xen hypervisor block driver couldn't accurately validate incoming requests. Therefore, a user with root privileges could crash a system and cause a DoS (Denial of Service) attack by executing malicious I/O requests. This issue affects only Ubuntu 7.10.

2. The i915 video driver couldn't accurately validate memory addresses. Therefore, an attacker could remap memory and cause a system crash, leading to a DoS (Denial of Service) attack. Ubuntu 6.06 LTS, 7.10 and 8.04 LTS users are not affected by this issue. Ubuntu 8.10 users should update their systems to correct this vulnerability!

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