CVE-2026-89948: Software Security Vulnerability Vulnerability

UNKNOWN
Advisory Identifier: GHSA-9m5r-cr5m-2hhr
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Advisory Summary

CVE-2026-89948 is a security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-89948 at a Glance

CVE Identifier CVE-2026-89948
GHSA Identifier GHSA-9m5r-cr5m-2hhr
Severity N/A
CVSS v3.1 Base Score N/A
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-89948

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-2026-89948, 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: batman-adv: bla: fix freeing of claims on meshif deletion When the mesh interface is getting deleted, then batadv_bla_del_backbone_claims() (via batadv_bla_purge_backbone_gw()) could make sure that all claims gets removed. But this function is only executed when bat_priv->bla.claim_hash is not NULL. And since batadv_bla_free() is always setting it to NULL before it is (indirectly) called, it was never actually executed. But the batadv_bla_purge_claims() -> batadv_handle_unclaim() is at the moment too fragile because the BLA code is not handling the rehashing in batadv_bla_update_orig_address(). The stored backbone address doesn't have to be the one actually used for the hash bucket selection during the initial adding of the backbone. The batadv_handle_unclaim() can therefore fail to find the respective backbone for the unclaim and then stop the deletion. But the actual backbone_gw object is not needed for the unclaim because all relevant information is always provided by the caller. And the check for the existence of the backbone_gw doesn't provide any additional security check for the deletion of a claim.

References

NVD — CVE-2026-89948 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89948
git.kernel.org/stable/c/76aedcde5a... WEB
https://git.kernel.org/stable/c/76aedcde5a2489cc971d4d1e396e784a49565e96
git.kernel.org/stable/c/844a95a734... WEB
https://git.kernel.org/stable/c/844a95a734f178d56c7acce14c5cce2cecff7e1a
git.kernel.org/stable/c/871acdf97f... WEB
https://git.kernel.org/stable/c/871acdf97f64cee8398f72b88b89e8b4f4816dbe
git.kernel.org/stable/c/8d128c932b... WEB
https://git.kernel.org/stable/c/8d128c932bced74e3b1625ba3d7c78ef122a88a7
git.kernel.org/stable/c/9a0c47023d... WEB
https://git.kernel.org/stable/c/9a0c47023d3254048a1588534755d4476bcc3abc
git.kernel.org/stable/c/aacffa780a... WEB
https://git.kernel.org/stable/c/aacffa780a37e06cd5a13d33740a6e96c3a67e6c
git.kernel.org/stable/c/baeb1a28fd... WEB
https://git.kernel.org/stable/c/baeb1a28fd8e2f68193650d3664a8cd1adfd85c6
git.kernel.org/stable/c/f50edb6908... WEB
https://git.kernel.org/stable/c/f50edb69082a8ba990cc23d642089829f99afe6a

Frequently Asked Questions

What is CVE-2026-89948?
CVE-2026-89948 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-2026-89948?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-89948?
CVE-2026-89948 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-89948?
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-9m5r-cr5m-2hhr",
  "modified" : "2026-09-16T12:30:42Z",
  "published" : "2026-09-16T12:30:42Z",
  "aliases" : [ "CVE-2026-89948" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: bla: fix freeing of claims on meshif deletion\n\nWhen the mesh interface is getting deleted, then\nbatadv_bla_del_backbone_claims() (via batadv_bla_purge_backbone_gw()) could\nmake sure that all claims gets removed. But this function is only executed\nwhen bat_priv->bla.claim_hash is not NULL. And since batadv_bla_free() is\nalways setting it to NULL before it is (indirectly) called, it was never\nactually executed.\n\nBut the batadv_bla_purge_claims() -> batadv_handle_unclaim() is at the\nmoment too fragile because the BLA code is not handling the rehashing in\nbatadv_bla_update_orig_address(). The stored backbone address doesn't have\nto be the one actually used for the hash bucket selection during the\ninitial adding of the backbone. The batadv_handle_unclaim() can therefore\nfail to find the respective backbone for the unclaim and then stop the\ndeletion.\n\nBut the actual backbone_gw object is not needed for the unclaim because all\nrelevant information is always provided by the caller. And the check for\nthe existence of the backbone_gw doesn't provide any additional security\ncheck for the deletion of a claim.",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-89948"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/76aedcde5a2489cc971d4d1e396e784a49565e96"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/844a95a734f178d56c7acce14c5cce2cecff7e1a"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/871acdf97f64cee8398f72b88b89e8b4f4816dbe"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/8d128c932bced74e3b1625ba3d7c78ef122a88a7"
  }, {
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    "type" : "WEB",
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  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/baeb1a28fd8e2f68193650d3664a8cd1adfd85c6"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/f50edb69082a8ba990cc23d642089829f99afe6a"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : null,
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-16T11:17:04Z"
  }
}