{
  "cveId": "CVE-2026-89709",
  "url": "https://patchblox.com/security/cve/CVE-2026-89709",
  "summary": "CVE-2026-89709 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-89709, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "lockd, nfsd: RCU-protect nlmsvc_ops dispatch",
  "description": "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\u0027s .rodata and the fopen/fclose callbacks live in nfsd\u0027s .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() \u002B 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.",
  "published": "2026-09-11T20:19:58Z",
  "severity": "Moderate",
  "cvss": 8.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00532,
  "epssPercentile": 0.4518,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89709",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-89709",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89709",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-89709",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89709",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}