# 20220314_coreos-status-QNAP-nfs-post SUBJECT: Latest kernel update can cause NFS mount failures The most recent kernel update to 5.16.13-200.fc35 has been reported to cause failures for NFS clients connecting to some QNAP NASsystems. Details of the issue as well as links to upstream forum posts and downstream bug reports can be found in [our issue tracker](https://github.com/coreos/fedora-coreos-tracker/issues/1121). Fortunately this bug was caught in our `testing` stream. Unfortunately, we do need to proceed promoting this kernel into our `stable` stream because the update will fix [CVE-2022-0847](https://github.com/coreos/fedora-coreos-tracker/issues/1118) (known as "dirty pipe"). If you will be affected by this bug, the easiest workaround is to switch the mount options for the mount to add `vers=4.0` for NFS 4.0. You can then follow progress in the tracker issue to know when to revert the change. Dusty Mabe for the Fedora CoreOS Team --- - overriding the kernel to freeze on kernel-5.15.18-200.fc35 - `sudo rpm-ostree override replace https://bodhi.fedoraproject.org/updates/FEDORA-2022-a39015bec2`