CVE-2026-89709

CVE CVE-2026-89709EUVD EUVD-2026-76621Published 2026-09-11T19:46:24.000ZLast changed 2026-09-13T06:33:32.000ZCVSS 8.1

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3c461a1820088fb5889d73a6522369bde45527a9; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <641e5e20852359b8c31149be4598884e30652f60; patch: 0; patch: 7.3-rc1; 2.6.12; patch: 7.2.4

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

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