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Ubuntu Security Notice USN-869-1 December 10, 2009
linux vulnerability
CVE-2009-1298, CVE-2009-4131
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A security issue affects the following Ubuntu releases:

Ubuntu 9.10

This advisory also applies to the corresponding versions of
Kubuntu, Edubuntu, and Xubuntu.

The problem can be corrected by upgrading your system to the
following package versions:

Ubuntu 9.10:
linux-image-2.6.31-16-386 2.6.31-16.53
linux-image-2.6.31-16-generic 2.6.31-16.53
linux-image-2.6.31-16-generic-pae 2.6.31-16.53
linux-image-2.6.31-16-ia64 2.6.31-16.53
linux-image-2.6.31-16-lpia 2.6.31-16.53
linux-image-2.6.31-16-powerpc 2.6.31-16.53
linux-image-2.6.31-16-powerpc-smp 2.6.31-16.53
linux-image-2.6.31-16-powerpc64-smp 2.6.31-16.53
linux-image-2.6.31-16-server 2.6.31-16.53
linux-image-2.6.31-16-sparc64 2.6.31-16.53
linux-image-2.6.31-16-sparc64-smp 2.6.31-16.53
linux-image-2.6.31-16-virtual 2.6.31-16.53

After a standard system upgrade you need to reboot your computer to
effect the necessary changes.

Details follow:

David Ford discovered that the IPv4 defragmentation routine did not
correctly handle oversized packets. A remote attacker could send
specially crafted traffic that would cause a system to crash, leading
to a denial of service. (The fix was included in the earlier kernels
from USN-864-1.) (CVE-2009-1298)

Akira Fujita discovered that the Ext4 “move extents” ioctl did not
correctly check permissions. A local attacker could exploit this to
overwrite arbitrary files on the system, leading to root privilege
escalation. (CVE-2009-4131)