# CVE-2026-89714 ## Summary - **CVE ID:** CVE-2026-89714 - **Severity:** UNKNOWN - **CVSS Score:** 1.51 - **CWE:** N/A - **Published:** Sep 11, 2026 - **Last Modified:** Sep 16, 2026 ## Description In the Linux kernel, the following vulnerability has been resolved: NFS: fix delegation_hash_table leak when nfs4_server_common_setup() fails nfs4_server_common_setup() allocates server->delegation_hash_table first, but server->destroy - the only path that frees the table via nfs4_destroy_server() - is not assigned until the very end of the function. If any intermediate step fails (the is_ds_only_client() check, nfs4_init_session(), nfs4_get_rootfh(), or nfs_probe_server()), the function returns with server->destroy still NULL, so the caller's nfs_free_server() skips the destroy callback and the hash table is leaked (4 KiB per attempt with the default delegation watermark). This is trivially reachable from userspace: every failed NFSv4 mount leaks one allocation. A client that persistently retries a mount that cannot succeed leaks kernel memory without bound. Observed in production where a Longhorn backup poller retried mount.nfs4 against an NFSv3-only server roughly 10 times per second, leaking ~3.4 GiB of unreclaimable slab (kmalloc-rnd-13-4k) per day; the node accumulated 12 GiB of leaked slab before the source was identified via the kmem:kmalloc tracepoint (call_site=nfs4_delegation_hash_alloc). Reproducer: # server exports NFSv3 only (or export path absent for v4) while :; do mount -t nfs4 :/missing /mnt; done # watch SUnreclaim in /proc/meminfo grow 4 KiB per iteration Free the table on the error paths between the allocation and the assignment of server->destroy. ## Affected Products - Linux — Linux (f5b3108e6a14418b120a3c38ca589b8d6cf87627) - Linux — Linux (6.17) - Linux — Linux (0) - Linux — Linux (6.18.50) - Linux — Linux (7.2.4) - Linux — Linux (7.3-rc1) ## References - [CNA](https://git.kernel.org/stable/c/f3adf1643517357221422c05986d6de5df7b9913) - [CNA](https://git.kernel.org/stable/c/0fd2b9687dae36be5b84eab39b4c627bb7ab33b3) - [CNA](https://git.kernel.org/stable/c/2092f5b38f88be306140c77aeeeb43fc1adacacc) ## Exploitation Prediction (EPSS) - **EPSS Score:** 0.20% - **EPSS Percentile:** 9.8 --- _Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._