CVE-2026-89709lockd, nfsd: RCU-protect nlmsvc_ops dispatch
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: lockd, nfsd: RCU-protect nlmsvc_ops dispatch nlmsvc_ops is published by nfsd_lockd_init() and cleared by nfsd_lockd_shutdown() with plain stores, while lockd dereferences it unguarded from dispatch sites in fs/lockd/svcsubs.c. The pointer targets nfsd's .rodata and the fopen/fclose callbacks live in nfsd's .text, so a stale load after rmmod nfsd results in either a NULL deref or a module-text use-after-free. Declare nlmsvc_ops as __rcu, publish via rcu_assign_pointer(), clear via RCU_INIT_POINTER() + synchronize_rcu(). Add a struct module *owner field to nlmsvc_binding and pin the module across indirect calls with try_module_get/module_put. When the binding is torn down, fall back to fput() to avoid leaking struct file references.
- CVSS
- 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 836ce2b99bcce6d68c58edd04efbc5cd1fd581af; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 3c461a1820088fb5889d73a6522369bde45527a9; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 641e5e20852359b8c31149be4598884e30652f60 | CNA record |
References
- https://git.kernel.org/stable/c/836ce2b99bcce6d68c58edd04efbc5cd1fd581af
- https://git.kernel.org/stable/c/3c461a1820088fb5889d73a6522369bde45527a9
- https://git.kernel.org/stable/c/641e5e20852359b8c31149be4598884e30652f60
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.