CVE-2009-3623

The lookup_cb_cred function in fs/nfsd/nfs4callback.c in the nfsd4
subsystem in the Linux kernel before 2.6.31.2 attempts to access a
credentials cache even when a client specifies the AUTH_NULL authentication
flavor, which allows remote attackers to cause a denial of service (NULL
pointer dereference and system crash) via an NFSv4 mount request.

Bugs

• <https://bugzilla.redhat.com/show_bug.cgi?id=530269&gt;