CVE-2026-89668
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk7th percentile - higher than 7% of all known CVEs
Summary
In the Linux kernel, init_nfsd() calls nfsd_debugfs_init() before nfsd4_init_slabs(). If slab allocation fails, the early return bypasses nfsd_debugfs_exit(), leaving orphan debugfs files with stale fops pointers into freed module text.
Risk Assessment
Orphaned debugfs files can lead to use-after-free when accessed, risking system instability or privilege escalation.
Recommendation
Update the Linux kernel to a version where nfsd_debugfs_init() runs after nfsd4_init_slabs() and unwind paths follow reverse (LIFO) initialization order.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS