USN-661-1: Linux kernel regression
Ubuntu Security Notice USN-661-1
30th October, 2008
linux regression
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 8.10
Software description
- linux
- procps
Details
Version 2.6.27 of the Linux kernel changed the order of options in
TCP headers. While this change was RFC-compliant, it was found that
some old routers and consumer DSL modems would not route traffic for
these systems when TCP timestamps were enabled. As a workaround, TCP
timestamps were disabled via sysctl.
This update restores the previous ordering of TCP options, and
reenables TCP timestamps. We apologize for the inconvenience.
Update instructions
The problem can be corrected by updating your system to the following package version:
- Ubuntu 8.10:
- linux-image-2.6.27-7-virtual 2.6.27-7.15
- linux-image-2.6.27-7-generic 2.6.27-7.15
- linux-image-2.6.27-7-server 2.6.27-7.15
- procps 1:3.2.7-9ubuntu2.1
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system upgrade you need to reboot your computer to
effect the necessary changes.