CVE-2026-53243: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-qhcg-6255-c538
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CVSS 5.5
CWE-908
Published
Advisory Summary

CVE-2026-53243 is a MODERATE (CVSS 5.5) security vulnerability vulnerability (CWE-908: Use of Uninitialized Resource) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product uses or accesses a resource that has not been initialized.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-53243 at a Glance

CVE Identifier CVE-2026-53243
GHSA Identifier GHSA-qhcg-6255-c538
Severity MODERATE
CVSS v3.1 Base Score 5.5
CWE Classification CWE-908: Use of Uninitialized Resource
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.5

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:N/I:N/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 None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2026-53243

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-2026-53243, 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 CWE-908: Use of Uninitialized Resource, where the product uses or accesses a resource that has not been initialized. 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: rseq: Fix using an uninitialized stack variable in rseq_exit_user_update() There is an bug in which an uninitialized stack variable is used in rseq_exit_user_update() as reported by syzbot: BUG: KMSAN: kernel-infoleak in rseq_set_ids_get_csaddr include/linux/rseq_entry.h:502 [inline] The local variable: struct rseq_ids ids = { .cpu_id = task_cpu(t), .mm_cid = task_mm_cid(t), .node_id = cpu_to_node(ids.cpu_id), }; According to the C standard, the evaluation order of expressions in an initializer list is indeterminately sequenced. The compiler (Clang, in this KMSAN build) evaluates `cpu_to_node(ids.cpu_id)` *before* `ids.cpu_id` is initialized with `task_cpu(t)`. This is fixed by moving the assignment of ids.node_id outside the structure initialization.

References

NVD — CVE-2026-53243 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-53243
git.kernel.org/stable/c/6d99479799... WEB
https://git.kernel.org/stable/c/6d99479799c69c3cb588fcda19c81d8f61d64ecd
git.kernel.org/stable/c/e12d20a63b... WEB
https://git.kernel.org/stable/c/e12d20a63b61aaf9de4772effccf42cc9a003e58

Frequently Asked Questions

What is CVE-2026-53243?
CVE-2026-53243 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-908: Use of Uninitialized Resource.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-53243?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-53243?
CVE-2026-53243 has a CVSS v3.1 base score of 5.5 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-53243?
CVE-2026-53243 is classified under CWE-908: Use of Uninitialized Resource (The product uses or accesses a resource that has not been initialized.).
How can I check Maven dependencies for CVE-2026-53243?
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-qhcg-6255-c538",
  "modified" : "2026-07-08T00:37:52Z",
  "published" : "2026-06-25T09:31:22Z",
  "aliases" : [ "CVE-2026-53243" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nrseq: Fix using an uninitialized stack variable in rseq_exit_user_update()\n\nThere is an bug in which an uninitialized stack variable is used in\nrseq_exit_user_update() as reported by syzbot:\n\nBUG: KMSAN: kernel-infoleak in rseq_set_ids_get_csaddr include/linux/rseq_entry.h:502 [inline]\n\nThe local variable:\n\n\tstruct rseq_ids ids = {\n\t\t.cpu_id\t = task_cpu(t),\n\t\t.mm_cid\t = task_mm_cid(t),\n\t\t.node_id = cpu_to_node(ids.cpu_id),\n\t};\n\nAccording to the C standard, the evaluation order of expressions in an\ninitializer list is indeterminately sequenced. The compiler (Clang, in\nthis KMSAN build) evaluates `cpu_to_node(ids.cpu_id)` *before*\n`ids.cpu_id` is initialized with `task_cpu(t)`.\n\nThis is fixed by moving the assignment of ids.node_id outside the\nstructure initialization.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-53243"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/6d99479799c69c3cb588fcda19c81d8f61d64ecd"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/e12d20a63b61aaf9de4772effccf42cc9a003e58"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-908" ],
    "severity" : "MODERATE",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-06-25T09:16:42Z"
  }
}