Answer in brief
CVE-2026-89709 records a High severity (CVSS 8.1) vulnerability in lockd, nfsd: RCU-protect nlmsvc_ops dispatch. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3c461a1820088fb5889d73a6522369bde45527a9 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <641e5e20852359b8c31149be4598884e30652f60 | 3c461a1820088fb5889d73a6522369bde45527a9, 641e5e20852359b8c31149be4598884e30652f60 |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <836ce2b99bcce6d68c58edd04efbc5cd1fd581af || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3c461a1820088fb5889d73a6522369bde45527a9 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <641e5e20852359b8c31149be4598884e30652f60 | 836ce2b99bcce6d68c58edd04efbc5cd1fd581af, 3c461a1820088fb5889d73a6522369bde45527a9, 641e5e20852359b8c31149be4598884e30652f60 |
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <43943532c105ea8fe26039a1347cfda4ac0fcadc || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6e7495972039f212e336e552b58cac9dd54611c3 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <836ce2b99bcce6d68c58edd04efbc5cd1fd581af || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3c461a1820088fb5889d73a6522369bde45527a9 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <641e5e20852359b8c31149be4598884e30652f60 | 43943532c105ea8fe26039a1347cfda4ac0fcadc, 6e7495972039f212e336e552b58cac9dd54611c3, 836ce2b99bcce6d68c58edd04efbc5cd1fd581af, 3c461a1820088fb5889d73a6522369bde45527a9, 641e5e20852359b8c31149be4598884e30652f60 |
Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 11, 2026
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.
Quoted source text, attributed separately from HOL analysis.