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 by malicious people to cause a DoS.

1) A vulnerability is caused due to an error within the "parisc_show_stack()" function when trying to unwind a stack containing userspace addresses, which can be exploited to crash a vulnerable system.

Successful exploitation requires that the kernel is running on a PARISC 32bit or 64bit machine.

2) A vulnerability is caused due to knfsd not properly verifying if there's enough available memory, which can be exploited to cause a NULL pointer dereference when e.g. exporting shmemfs objects and running strict overcommit.

Solution
Update to version 2.6.28.
Further details available in Customer Area

Provided and/or discovered by
1) Helge Deller
2) The vendor credits Junjiro R. Okajima.

Changelog
Further details available in Customer Area

Original Advisory
1) http://marc.info/?l=linux-parisc&m=121736357203624&w=2
2) http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=731572d39fcd3498702eda4600db4c43d51e0b26
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=1b79cd04fab80be61dcd2732e2423aafde9a4c1c
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.27.47

Deep Links
Links available in Customer Area