CVE-2026-93186: Software Security Vulnerability Vulnerability

UNKNOWN
Advisory Identifier: GHSA-4xf9-vh86-48mc
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Advisory Summary

CVE-2026-93186 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-2026-93186 at a Glance

CVE Identifier CVE-2026-93186
GHSA Identifier GHSA-4xf9-vh86-48mc
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-2026-93186

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-2026-93186, 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: cxl/mbox: Clamp mailbox output allocation to the payload size CXL_MEM_SEND_COMMAND bounds the user's in.size to the mailbox payload size but leaves out.size unbounded, then cxl_mbox_cmd_ctor() calls kvzalloc(out.size). A large out.size drives a huge allocation, above INT_MAX it WARNs and taints, and with panic_on_warn=1 it panics. The transport __cxl_pci_mbox_send_cmd() already clamps the response copy to min(out.size, payload_size, device len), so the output buffer is never written beyond payload_size. Clamp the allocation to payload_size too, matching the RAW path.

References

NVD — CVE-2026-93186 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-93186
git.kernel.org/stable/c/31d4841eca... WEB
https://git.kernel.org/stable/c/31d4841eca7c4b75751ca96d24339e19303337f2
git.kernel.org/stable/c/8a13db9f89... WEB
https://git.kernel.org/stable/c/8a13db9f899d149c3aab24abcb668121cfda5a4f
git.kernel.org/stable/c/b4e11c731d... WEB
https://git.kernel.org/stable/c/b4e11c731d6bee3b87315e055a1ca417c92dc1fc
git.kernel.org/stable/c/f5d2bbf030... WEB
https://git.kernel.org/stable/c/f5d2bbf0300f46307948864fbb97bce5097f4fe2

Frequently Asked Questions

What is CVE-2026-93186?
CVE-2026-93186 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-2026-93186?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-93186?
CVE-2026-93186 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-93186?
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-4xf9-vh86-48mc",
  "modified" : "2026-09-17T18:32:13Z",
  "published" : "2026-09-17T18:32:13Z",
  "aliases" : [ "CVE-2026-93186" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/mbox: Clamp mailbox output allocation to the payload size\n\nCXL_MEM_SEND_COMMAND bounds the user's in.size to the mailbox payload\nsize but leaves out.size unbounded, then cxl_mbox_cmd_ctor() calls\nkvzalloc(out.size). A large out.size drives a huge allocation, above\nINT_MAX it WARNs and taints, and with panic_on_warn=1 it panics.\n\nThe transport __cxl_pci_mbox_send_cmd() already clamps the response copy\nto min(out.size, payload_size, device len), so the output buffer is\nnever written beyond payload_size. Clamp the allocation to payload_size\ntoo, matching the RAW path.",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-93186"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/31d4841eca7c4b75751ca96d24339e19303337f2"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/8a13db9f899d149c3aab24abcb668121cfda5a4f"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/b4e11c731d6bee3b87315e055a1ca417c92dc1fc"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/f5d2bbf0300f46307948864fbb97bce5097f4fe2"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : null,
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-17T17:18:14Z"
  }
}