mm/shmem.c in the Linux kernel before 2.6.28-rc3, when strict overcommit is enabled, does not properly handle the export of shmemfs objects by knfsd, which allows attackers to cause a denial of service (NULL pointer dereference and knfsd crash) or possibly have unspecified other impact via unknown vectors.
http://lists.opensuse.org/opensuse-security-announce/2010-07/msg00006.html
https://bugzilla.redhat.com/show_bug.cgi?id=595970
http://secunia.com/advisories/40645
https://exchange.xforce.ibmcloud.com/vulnerabilities/58957
http://www.kernel.org/pub/linux/kernel/v2.6/testing/v2.6.28/ChangeLog-2.6.28-rc3
http://www.mandriva.com/security/advisories?name=MDVSA-2010:198
http://www.openwall.com/lists/oss-security/2010/05/26/2