CVE-2026-89957: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-pgcj-5wj3-jcmr
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CVSS 8.8
Published
Advisory Summary

CVE-2026-89957 is a HIGH (CVSS 8.8) security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-89957 at a Glance

CVE Identifier CVE-2026-89957
GHSA Identifier GHSA-pgcj-5wj3-jcmr
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 8.8

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

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

How to Fix CVE-2026-89957

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-2026-89957, 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: s390/vfio-ap: Fix hot-unplug skipped when last AP adapter or domain removed The vfio_ap_mdev_hot_unplug_cfg() function uses the return value of bitmap_andnot() to determine whether the guest APCB needs to be updated. However, bitmap_andnot() returns false when the resulting destination bitmap is empty. This means that if the only adapter, domain or control domain assigned to an mdev is removed from the host's AP configuration, the bit is correctly cleared from the shadow APCB, but bitmap_andnot() returns false because the result is an empty bitmap. Consequently, do_hotplug remains 0 and vfio_ap_mdev_update_guest_apcb() is never called, leaving the KVM guest with stale hardware access to the unplugged AP devices. Fix this by replacing the bitmap_andnot() return value check with bitmap_intersects() to determine whether the shadow APCB actually overlaps with the removal mask. If there is an intersection, call bitmap_andnot() solely for its side effect of clearing the bits, then unconditionally set do_hotplug to trigger the guest APCB update.

References

NVD — CVE-2026-89957 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89957
git.kernel.org/stable/c/04b35dd88c... WEB
https://git.kernel.org/stable/c/04b35dd88c108b2d2ceaaa396aba1cb4049d5831
git.kernel.org/stable/c/3a9b049bbd... WEB
https://git.kernel.org/stable/c/3a9b049bbdc40165d7f3e20b818eec95e5694d96
git.kernel.org/stable/c/753aa3bb12... WEB
https://git.kernel.org/stable/c/753aa3bb1273bc0d36adb013d5915cc8ff6b72a9
git.kernel.org/stable/c/917f509bfb... WEB
https://git.kernel.org/stable/c/917f509bfb88048094dbb85c4e9dbc4d6fe4a886
git.kernel.org/stable/c/c45753c32d... WEB
https://git.kernel.org/stable/c/c45753c32d452d10d8efaeb52587e9e6e8126e33
git.kernel.org/stable/c/f58e824de8... WEB
https://git.kernel.org/stable/c/f58e824de8577fe411f6199d659731a0f86a7275

Frequently Asked Questions

What is CVE-2026-89957?
CVE-2026-89957 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-2026-89957?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-89957?
CVE-2026-89957 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
What CWE is associated with CVE-2026-89957?
CVE-2026-89957 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-89957?
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-pgcj-5wj3-jcmr",
  "modified" : "2026-09-16T15:31:03Z",
  "published" : "2026-09-16T12:30:43Z",
  "aliases" : [ "CVE-2026-89957" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/vfio-ap: Fix hot-unplug skipped when last AP adapter or domain removed\n\nThe vfio_ap_mdev_hot_unplug_cfg() function uses the return value of\nbitmap_andnot() to determine whether the guest APCB needs to be updated.\nHowever, bitmap_andnot() returns false when the resulting destination\nbitmap is empty. This means that if the only adapter, domain or control\ndomain assigned to an mdev is removed from the host's AP configuration,\nthe bit is correctly cleared from the shadow APCB, but bitmap_andnot()\nreturns false because the result is an empty bitmap. Consequently,\ndo_hotplug remains 0 and vfio_ap_mdev_update_guest_apcb() is never called,\nleaving the KVM guest with stale hardware access to the unplugged AP\ndevices.\n\nFix this by replacing the bitmap_andnot() return value check with\nbitmap_intersects() to determine whether the shadow APCB actually\noverlaps with the removal mask. If there is an intersection, call\nbitmap_andnot() solely for its side effect of clearing the bits, then\nunconditionally set do_hotplug to trigger the guest APCB update.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-89957"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/04b35dd88c108b2d2ceaaa396aba1cb4049d5831"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/3a9b049bbdc40165d7f3e20b818eec95e5694d96"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/753aa3bb1273bc0d36adb013d5915cc8ff6b72a9"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/917f509bfb88048094dbb85c4e9dbc4d6fe4a886"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/c45753c32d452d10d8efaeb52587e9e6e8126e33"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/f58e824de8577fe411f6199d659731a0f86a7275"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-16T11:17:06Z"
  }
}