CVE-2026-89668

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

nfsd: move nfsd_debugfs_init() after nfsd4_init_slabs() in init_nfsd()

nfsd_debugfs_init() runs before nfsd4_init_slabs() in init_nfsd().

If the slab allocation fails, the bare "return retval" bypasses

nfsd_debugfs_exit(), leaving orphan debugfs files with stale fops

pointers into the freed module text.

Move nfsd_debugfs_init() to after the slab init succeeds, so the

early return has no debugfs state to clean up.

Since debugfs is now the more recently initialized of the two, also

update the unwind paths to match reverse-initialization (LIFO) order:

run nfsd_debugfs_exit() before nfsd4_free_slabs() in both the

init_nfsd() error path and exit_nfsd(). The nfsd debugfs files only

reference module-global state and have no dependency on the slab

caches, so that reordering is a cleanup with no functional change.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References