A number of vulnerabilities have been discovered in the Linux kernel.
CVE-2002-0429: The iBCS routines in arch/i386/kernel/traps.c for Linux kernels 2.4.18 and earlier on x86 systems allow local users to kill arbitrary processes via a binary compatibility interface (lcall).
CAN-2003-0001: Multiple ethernet Network Interface Card (NIC) device drivers do not pad frames with null bytes, which allows remote attackers to obtain information from previous packets or kernel memory by using malformed packets.
CAN-2003-0127: The kernel module loader allows local users to gain root privileges by using ptrace to attach to a child process that is spawned by the kernel.
CAN-2003-0244: The route cache implementation in Linux 2.4, and the Netfilter IP conntrack module, allows remote attackers to cause a denial of service (CPU consumption) via packets with forged source addresses that cause a large number of hash table collisions related to the PREROUTING chain.
CAN-2003-0246: The ioperm system call in Linux kernel 2.4.20 and earlier does not properly restrict privileges, which allows local users to gain read or write access to certain I/O ports.
CAN-2003-0247: Vulnerability in the TTY layer of the Linux kernel 2.4 allows attackers to cause a denial of service ("kernel oops").
CAN-2003-0248: The mxcsr code in Linux kernel 2.4 allows attackers to modify CPU state registers via a malformed address.
CAN-2003-0364: The TCP/IP fragment reassembly handling in the Linux kernel 2.4 allows remote attackers to cause a denial of service (CPU consumption) via certain packets that cause a large number of hash table collisions.
This advisory covers only the i386 (Intel IA32) architectures. Other architectures will be covered by separate advisories.
For the stable distribution (woody) on the i386 architecture, these problems have been fixed in kernel-source-2.4.18 version 2.4.18-9, kernel-image-2.4.18-1-i386 version 2.4.18-8, and kernel-image-2.4.18-i386bf version 2.4.18-5woody1.
For the unstable distribution (sid) these problems are fixed in the 2.4.20 series kernels based on Debian sources.
We recommend that you update your kernel packages.
If you are using the kernel installed by the installation system when the "bf24" option is selected (for a 2.4.x kernel), you should install the kernel-image-2.4.18-bf2.4 package. If you installed a different kernel-image package after installation, you should install the corresponding 2.4.18-1 kernel. You may use the table below as a guide.
| If "uname -r" shows: | Install this package: | 2.4.18-bf2.4 | kernel-image-2.4.18-bf2.4 | 2.4.18-386 | kernel-image-2.4.18-1-386 | 2.4.18-586tsc | kernel-image-2.4.18-1-586tsc | 2.4.18-686 | kernel-image-2.4.18-1-686 | 2.4.18-686-smp | kernel-image-2.4.18-1-686-smp | 2.4.18-k6 | kernel-image-2.4.18-1-k6 | 2.4.18-k7 | kernel-image-2.4.18-1-k7
NOTE: that this kernel is not binary compatible with the previous version. For this reason, the kernel has a different version number and will not be installed automatically as part of the normal upgrade process. Any custom modules will need to be rebuilt in order to work with the new kernel. New PCMCIA modules are provided for all of the above kernels.
NOTE: A system reboot will be required immediately after the upgrade in order to replace the running kernel. Remember to read carefully and follow the instructions given during the kernel upgrade process.
MD5 checksums of the listed files are available in the original advisory.