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=========================================================== Ubuntu Security Notice USN-187-1 September 25, 2005 linux-source-2.6.10, linux-source-2.6.8.1 vulnerabilities CAN-2005-1767, CAN-2005-3044 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 4.10 (Warty Warthog) Ubuntu 5.04 (Hoary Hedgehog) The following packages are affected: linux-image-2.6.8.1-5-386 linux-image-2.6.8.1-5-686 linux-image-2.6.8.1-5-686-smp linux-image-2.6.8.1-5-amd64-generic linux-image-2.6.8.1-5-amd64-k8 linux-image-2.6.8.1-5-amd64-k8-smp linux-image-2.6.8.1-5-amd64-xeon linux-image-2.6.8.1-5-k7 linux-image-2.6.8.1-5-k7-smp linux-image-2.6.8.1-5-power3 linux-image-2.6.8.1-5-power3-smp linux-image-2.6.8.1-5-power4 linux-image-2.6.8.1-5-power4-smp linux-image-2.6.8.1-5-powerpc linux-image-2.6.8.1-5-powerpc-smp linux-image-2.6.10-5-386 linux-image-2.6.10-5-686 linux-image-2.6.10-5-686-smp linux-image-2.6.10-5-amd64-generic linux-image-2.6.10-5-amd64-k8 linux-image-2.6.10-5-amd64-k8-smp linux-image-2.6.10-5-amd64-xeon linux-image-2.6.10-5-itanium linux-image-2.6.10-5-itanium-smp linux-image-2.6.10-5-k7 linux-image-2.6.10-5-k7-smp linux-image-2.6.10-5-mckinley linux-image-2.6.10-5-mckinley-smp linux-image-2.6.10-5-power3 linux-image-2.6.10-5-power3-smp linux-image-2.6.10-5-power4 linux-image-2.6.10-5-power4-smp linux-image-2.6.10-5-powerpc linux-image-2.6.10-5-powerpc-smp linux-patch-debian-2.6.8.1 linux-patch-ubuntu-2.6.10 The problem can be corrected by upgrading the affected package to version 2.6.8.1-16.23 (for Ubuntu 4.10), or 2.6.10-34.6 (for Ubuntu 5.04). After a standard system upgrade you need to restart your computer to effect the necessary changes. Details follow: A Denial of Service vulnerability was detected in the stack segment fault handler. A local attacker could exploit this by causing stack fault exceptions under special circumstances (scheduling), which lead to a kernel crash. (CAN-2005-1767) Vasiliy Averin discovered a Denial of Service vulnerability in the "tiocgdev" ioctl call and in the "routing_ioctl" function. By calling fget() and fput() in special ways, a local attacker could exploit this to destroy file descriptor structures and crash the kernel. (CAN-2005-3044)