CVE-2026-89520: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-q4pw-m5gm-wg9r
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CVSS 7.8
Published
Advisory Summary

CVE-2026-89520 is a HIGH (CVSS 7.8) security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-89520 at a Glance

CVE Identifier CVE-2026-89520
GHSA Identifier GHSA-q4pw-m5gm-wg9r
Severity HIGH
CVSS v3.1 Base Score 7.8
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.8

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:U/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 Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-89520

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-2026-89520, 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: sched/core: Make core-sched flips wait for in-flight selections Core scheduling's pick_next_task() operates on all sibling rqs under one acquisition of the shared core-wide lock. A ->pick_task() that releases the rq lock leaves every sibling __lock momentarily free, letting __sched_core_flip(false) complete mid-selection and rebind rq_lockp() under it. The selection resumes on the split locks, touching sibling state it no longer protects, and __schedule() finally releases a lock that was never taken while leaking the one that was. Count in-flight core-wide selections in the leader's rq->core_pick_in_flight and make __sched_core_flip() wait for the count to drain. The count only changes under the shared lock, which the flip holds while sampling, so no other ordering is needed. The wait can repeat while selections overlap, but the flip backs off between samples and flips are rare cookie-lifetime events. sched_core_cpu_deactivate() moves the count to the new leader - a stale copy left behind would bias it forever if that CPU later returns as its own leader.

References

NVD — CVE-2026-89520 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89520
git.kernel.org/stable/c/23eda24f32... WEB
https://git.kernel.org/stable/c/23eda24f325a6e6d686d30ec75f2e9d6745e2015
git.kernel.org/stable/c/3e2511bffa... WEB
https://git.kernel.org/stable/c/3e2511bffa93a639774a99e392181e21d28677e2
git.kernel.org/stable/c/9d69422dda... WEB
https://git.kernel.org/stable/c/9d69422ddaa13526c2223444e237d948d6e44728
git.kernel.org/stable/c/f3629c63a4... WEB
https://git.kernel.org/stable/c/f3629c63a4af3e491381780bc6c123cb498c4c40

Frequently Asked Questions

What is CVE-2026-89520?
CVE-2026-89520 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-2026-89520?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-89520?
CVE-2026-89520 has a CVSS v3.1 base score of 7.8 (HIGH) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-89520?
CVE-2026-89520 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-89520?
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-q4pw-m5gm-wg9r",
  "modified" : "2026-10-03T12:31:06Z",
  "published" : "2026-09-11T21:31:30Z",
  "aliases" : [ "CVE-2026-89520" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/core: Make core-sched flips wait for in-flight selections\n\nCore scheduling's pick_next_task() operates on all sibling rqs under one\nacquisition of the shared core-wide lock. A ->pick_task() that releases the\nrq lock leaves every sibling __lock momentarily free, letting\n__sched_core_flip(false) complete mid-selection and rebind rq_lockp() under\nit. The selection resumes on the split locks, touching sibling state it no\nlonger protects, and __schedule() finally releases a lock that was never\ntaken while leaking the one that was.\n\nCount in-flight core-wide selections in the leader's rq->core_pick_in_flight\nand make __sched_core_flip() wait for the count to drain. The count only\nchanges under the shared lock, which the flip holds while sampling, so no\nother ordering is needed. The wait can repeat while selections overlap, but\nthe flip backs off between samples and flips are rare cookie-lifetime\nevents.\n\nsched_core_cpu_deactivate() moves the count to the new leader - a stale copy\nleft behind would bias it forever if that CPU later returns as its own\nleader.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-89520"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/23eda24f325a6e6d686d30ec75f2e9d6745e2015"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/3e2511bffa93a639774a99e392181e21d28677e2"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/9d69422ddaa13526c2223444e237d948d6e44728"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/f3629c63a4af3e491381780bc6c123cb498c4c40"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-11T20:19:34Z"
  }
}