Several local and remote vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service or the execution of arbitrary code. The Common Vulnerabilities and Exposures project identifies the following problems:
Michal Miroslaw reported a DoS vulnerability (crash) in netfilter. A remote attacker can cause a NULL pointer dereference in the nfnetlink_log function.
Patrick McHardy reported an vulnerability in netfilter that may allow attackers to bypass certain firewall rules. The nfctinfo value of reassembled IPv6 packet fragments were incorrectly initialized to 0 which allowed these packets to become tracked as ESTABLISHED.
Jaco Kroon reported a bug in which NETLINK_FIB_LOOKUP packages were incorrectly routed back to the kernel resulting in an infinite recursion condition. Local users can exploit this behavior to cause a DoS (crash).
For the stable distribution (etch) these problems have been fixed in version 2.6.18.dfsg.1-12etch2.
The following matrix lists additional packages that were rebuilt for compatibility with or to take advantage of this update:
| Debian 4.0 (etch) | |
|---|---|
| fai-kernels | 1.17+etch2 |
| user-mode-linux | 2.6.18-1um-2etch2 |
| kernel-patch-openvz | 028.18.1etch1 |
We recommend that you upgrade your kernel package immediately and reboot the machine. If you have built a custom kernel from the kernel source package, you will need to rebuild to take advantage of these fixes.
MD5 checksums of the listed files are available in the original advisory.