CVE-2026-89915: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-crqv-c33h-f779
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CVSS 9.3
Published
Advisory Summary

CVE-2026-89915 is a CRITICAL (CVSS 9.3) security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-89915 at a Glance

CVE Identifier CVE-2026-89915
GHSA Identifier GHSA-crqv-c33h-f779
Severity CRITICAL
CVSS v3.1 Base Score 9.3
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 9.3

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

Attack Vector Local (AV:L)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
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-2026-89915

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-2026-89915, 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: KVM: arm64: Remove VM-wide VNCR mapping counter The global VNCR mapping counter is used to decide whether an L1 provided VNCR page is mapped in L0 on any CPU at the point of dealing with a TLB invalidation. It is incremented when a mapping is made in the fixmap, and decremented when unmapped. As it turns out, this tracking has several flaws: - we are trying to invalidate TLBs, and the mapping is only an opportunistic consequence of the TLB. Checking this counter to decide whether a TLB needs to be invalidated may result in missed invalidations. - an L1 vcpu invalidating its own TLB (a very likely case) will not succeed in invalidating the VNCR pseudo TLB because that page is not mapped in L0 at this stage. Given that this tracking fails at delivering the minimum guarantees that are required and is only a performance optimisation, remove it completely.

References

NVD — CVE-2026-89915 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89915
git.kernel.org/stable/c/5453b85c7e... WEB
https://git.kernel.org/stable/c/5453b85c7ebb605febac3df42021f9471663f051
git.kernel.org/stable/c/87c2bbf189... WEB
https://git.kernel.org/stable/c/87c2bbf189829dce4aaada8f82e3d54ccc037976
git.kernel.org/stable/c/c55bc773b6... WEB
https://git.kernel.org/stable/c/c55bc773b6e814406658fae7dc5c15f639ed816e

Frequently Asked Questions

What is CVE-2026-89915?
CVE-2026-89915 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-2026-89915?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-89915?
CVE-2026-89915 has a CVSS v3.1 base score of 9.3 (CRITICAL) with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
What CWE is associated with CVE-2026-89915?
CVE-2026-89915 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-89915?
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-crqv-c33h-f779",
  "modified" : "2026-09-16T15:31:02Z",
  "published" : "2026-09-16T12:30:41Z",
  "aliases" : [ "CVE-2026-89915" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Remove VM-wide VNCR mapping counter\n\nThe global VNCR mapping counter is used to decide whether an L1\nprovided VNCR page is mapped in L0 on any CPU at the point of\ndealing with a TLB invalidation. It is incremented when a mapping\nis made in the fixmap, and decremented when unmapped.\n\nAs it turns out, this tracking has several flaws:\n\n- we are trying to invalidate TLBs, and the mapping is only an\n  opportunistic consequence of the TLB. Checking this counter to\n  decide whether a TLB needs to be invalidated may result in missed\n  invalidations.\n\n- an L1 vcpu invalidating its own TLB (a very likely case) will not\n  succeed in invalidating the VNCR pseudo TLB because that page is\n  not mapped in L0 at this stage.\n\nGiven that this tracking fails at delivering the minimum guarantees\nthat are required and is only a performance optimisation, remove it\ncompletely.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-89915"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/5453b85c7ebb605febac3df42021f9471663f051"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/87c2bbf189829dce4aaada8f82e3d54ccc037976"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/c55bc773b6e814406658fae7dc5c15f639ed816e"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-16T11:17:00Z"
  }
}