Secunia

Some vulnerabilities have been reported in the Linux Kernel, which can be exploited by malicious, local users to cause a DoS (Denial of Service) and potentially gain escalated privileges, and by malicious people to cause a DoS.

1) A vulnerability is caused due to a memory leak when handling certain AppleTalk-IP datagrams. This can be exploited to cause a DoS due to memory exhaustion by e.g. sending a large amount of specially crafted AppleTalk-IP datagrams.

Successful exploitation requires that the appletalk and ipddp modules are loaded and attached to the same interface.

2) NULL pointer dereference errors exist within certain r128 IOCTL handlers when the CCE state is not properly initialised. This can be exploited to e.g. crash the kernel by sending specially crafted IOCTLs to the driver.

3) An error within the "update_cr8_intercept()" function in arch/x86/kvm/x86.c can be exploited to cause a NULL pointer dereference via the "-no-kvm-irqchip" option.

4) An integer overflow within the "kvm_dev_ioctl_get_supported_cpuid()" function in arch/x86/kvm/x86.c can be exploited to e.g. cause a crash by sending a specially crafted "KVM_GET_SUPPORTED_CPUID" IOCTL.

Note: This may affect 32bit systems only.

5) An error within the "fuse_ioctl_copy_user()" function in fs/fuse/file.c can be exploited to crash a system by sending specially crafted IOCTLs to FUSE.

Solution
Update to version 2.6.32.
Further details available in Customer Area

Provided and/or discovered by
1) Mark Smith
2, 3, 4) Reported by the vendor.
5) Todor Gyumyushev

Changelog
Further details available in Customer Area

Original Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2009-2903
http://git.kernel.org/?p=linux/kernel/git/davem/net-next-2.6.git;a=commit;h=ffcfb8db540ff879c2a85bf7e404954281443414
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=7dc482dfeeeefcfd000d4271c4626937406756d7
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=88c808fd42b53a7e01a2ac3253ef31fef74cb5af
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=6a54435560efdab1a08f429a954df4d6c740bddf
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=0bd87182d3ab18a32a8e9175d3f68754c58e3432

Deep Links
Links available in Customer Area