CVE-2026-89662: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-h9v2-7c48-mpxj
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CVSS 9.8
Published
Advisory Summary

CVE-2026-89662 is a CRITICAL (CVSS 9.8) security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-89662 at a Glance

CVE Identifier CVE-2026-89662
GHSA Identifier GHSA-h9v2-7c48-mpxj
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 9.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-89662

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-89662, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under General Security Weakness. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

In the Linux kernel, the following vulnerability has been resolved: NFSD: Prevent lock owner use-after-free during client teardown __destroy_client() releases a client's open owners, but a lock owner whose only reference is a blocked lock (nbl) stays on cl_ownerstr_hashtbl. client_has_state() does not count a bare owner, so DESTROY_CLIENTID can reach __destroy_client() with such owners present. __destroy_client() then walks the table, calling remove_blocked_locks() on each owner without a reference. Freeing a blocked lock drops the owner reference held via flc_owner. The per-net laundromat reaps blocked locks from nn->blocked_locks_lru independently of client state. The two paths share blocked_locks_lock only for the list splice, not the owner's lifetime. The laundromat therefore frees the owner as __destroy_client() dereferences it, a NULL dereference in remove_blocked_locks(). nfsd4_release_lockowner() holds a reference across the same call; __destroy_client() does not. Hold cl_lock across the walk, taking a reference and unhashing each owner, then drop it before remove_blocked_locks() and nfs4_put_stateowner(), which take blocked_locks_lock and cl_lock.

References

NVD — CVE-2026-89662 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89662
git.kernel.org/stable/c/1ce74d1b77... WEB
https://git.kernel.org/stable/c/1ce74d1b7770e69735e8f8e509807af4ff9c8ee7
git.kernel.org/stable/c/42d7954b0a... WEB
https://git.kernel.org/stable/c/42d7954b0a1907d4ef122aef94561952a033cdc3
git.kernel.org/stable/c/4804c58f73... WEB
https://git.kernel.org/stable/c/4804c58f73a80d12df1de323bf97a164f6ee8743
git.kernel.org/stable/c/5e2fa29d22... WEB
https://git.kernel.org/stable/c/5e2fa29d223a9a1e6a948e40b109d09081d1decd
git.kernel.org/stable/c/8cf4ff0a7c... WEB
https://git.kernel.org/stable/c/8cf4ff0a7c083dd5e0067f517d63979b74b66649
git.kernel.org/stable/c/a6ead6fff3... WEB
https://git.kernel.org/stable/c/a6ead6fff3a7d03e49845f048f7000a2e0d34431
git.kernel.org/stable/c/b8bad5a114... WEB
https://git.kernel.org/stable/c/b8bad5a11416b26cc7fd4b18fba46d75ff636558
git.kernel.org/stable/c/bb38ff8b4d... WEB
https://git.kernel.org/stable/c/bb38ff8b4dafbbd1781ad37cd96722fdf2cd972a

Frequently Asked Questions

What is CVE-2026-89662?
CVE-2026-89662 is a security vulnerability in Software classified as a security vulnerability vulnerability under General Security Weakness.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-89662?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-89662?
CVE-2026-89662 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-89662?
CVE-2026-89662 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-89662?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-h9v2-7c48-mpxj",
  "modified" : "2026-09-14T15:32:33Z",
  "published" : "2026-09-11T21:31:35Z",
  "aliases" : [ "CVE-2026-89662" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Prevent lock owner use-after-free during client teardown\n\n__destroy_client() releases a client's open owners, but a lock owner\nwhose only reference is a blocked lock (nbl) stays on\ncl_ownerstr_hashtbl.  client_has_state() does not count a bare owner,\nso DESTROY_CLIENTID can reach __destroy_client() with such owners\npresent.\n\n__destroy_client() then walks the table, calling remove_blocked_locks()\non each owner without a reference.  Freeing a blocked lock drops the\nowner reference held via flc_owner.  The per-net laundromat reaps\nblocked locks from nn->blocked_locks_lru independently of client state.\nThe two paths share blocked_locks_lock only for the list splice, not\nthe owner's lifetime.  The laundromat therefore frees the owner as\n__destroy_client() dereferences it, a NULL dereference in\nremove_blocked_locks().\n\nnfsd4_release_lockowner() holds a reference across the same call;\n__destroy_client() does not.  Hold cl_lock across the walk, taking a\nreference and unhashing each owner, then drop it before\nremove_blocked_locks() and nfs4_put_stateowner(), which take\nblocked_locks_lock and cl_lock.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-89662"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/1ce74d1b7770e69735e8f8e509807af4ff9c8ee7"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/42d7954b0a1907d4ef122aef94561952a033cdc3"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/4804c58f73a80d12df1de323bf97a164f6ee8743"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/5e2fa29d223a9a1e6a948e40b109d09081d1decd"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/8cf4ff0a7c083dd5e0067f517d63979b74b66649"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/a6ead6fff3a7d03e49845f048f7000a2e0d34431"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/b8bad5a11416b26cc7fd4b18fba46d75ff636558"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/bb38ff8b4dafbbd1781ad37cd96722fdf2cd972a"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-11T20:19:52Z"
  }
}