Notice: Debian 5.0.4, the next point release of Debian "lenny", will include a new default value for the mmap_min_addr tunable. This change will add an additional safeguard against a class of security vulnerabilities known as "NULL pointer dereference" vulnerabilities, but it will need to be overridden when using certain applications. Additional information about this change, including instructions for making this change locally in advance of 5.0.4 (recommended), can be found at: http://wiki.debian.org/mmap_min_addr. Several vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service, sensitive memory leak or privilege escalation. The Common Vulnerabilities and Exposures project identifies the following problems: Eric Dumazet reported an instance of uninitialized kernel memory in the network packet scheduler. Local users may be able to exploit this issue to read the contents of sensitive kernel memory. Linus Torvalds provided a change to the get_random_int() function to increase its randomness. Earl Chew discovered a NULL pointer dereference issue in the pipe_rdwr_open function which can be used by local users to gain elevated privileges. Jiri Pirko discovered a typo in the initialization of a structure in the netlink subsystem that may allow local users to gain access to sensitive kernel memory. Ben Hutchings discovered an issue in the DRM manager for ATI Rage 128 graphics adapters. Local users may be able to exploit this vulnerability to cause a denial of service (NULL pointer dereference). Tomoki Sekiyama discovered a deadlock condition in the UNIX domain socket implementation. Local users can exploit this vulnerability to cause a denial of service (system hang). David Wagner reported an overflow in the KVM subsystem on i386 systems. This issue is exploitable by local users with access to the /dev/kvm device file.