Description of problem:
It was found that lockd did not properly handle data packets that contained invalid data. This could be possibly exploited by unprivileged remote user to crash the server (DoS).
Red Hat would like to thank Adam Prince for reporting this issue.
This issue only affects Red Hat Enterprise Linux 6. We did not properly backport upstream commit b48fa6b9. So we needed additional patch that fixes the improper backport.
This issue only affects Red Hat Enterprise Linux 6 as we did not properly backport upstream commit b48fa6b9. The versions of the Linux kernel as shipped with Red Hat Enterprise Linux 4, 5, and Red Hat Enterprise MRG are not affected.
This issue has been addressed in following products:
Red Hat Enterprise Linux 6
Via RHSA-2011:0329 https://rhn.redhat.com/errata/RHSA-2011-0329.html