CVE-2026-63892: Software Security Vulnerability Vulnerability

UNKNOWN
Advisory Identifier: GHSA-c25w-638m-wrp7
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Advisory Summary

CVE-2026-63892 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-2026-63892 at a Glance

CVE Identifier CVE-2026-63892
GHSA Identifier GHSA-c25w-638m-wrp7
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-2026-63892

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-2026-63892, 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: thunderbolt: property: Reject dir_len < 4 to prevent size_t underflow On the non-root path, __tb_property_parse_dir() takes dir_len from entry->length (u16 widened to size_t). Two distinct OOB conditions follow when entry->length < 4: 1. The non-root path begins with kmemdup(&block[dir_offset], sizeof(*dir->uuid), ...) which always reads 4 dwords from dir_offset. tb_property_entry_valid() only enforces dir_offset + entry->length <= block_len, so a crafted entry with dir_offset close to the end of the property block and entry->length in 0..3 passes that gate but lets the UUID copy run off the block (e.g. dir_offset = 497, dir_len = 3 in a 500-dword block reads block[497..501]). 2. After the kmemdup, content_len = dir_len - 4 underflows size_t to ~SIZE_MAX, nentries becomes SIZE_MAX / 4, and the entry walk runs OOB on each iteration until an entry fails validation or the kernel oopses on an unmapped page. Reject dir_len < 4 on the non-root path *before* the UUID kmemdup, which closes both holes. Also move INIT_LIST_HEAD(&dir->properties) up to immediately after the dir allocation so the new error-return path (and the existing uuid-alloc failure path) calling tb_property_free_dir() sees a walkable list rather than the zero-initialized NULL next/prev that list_for_each_entry_safe() would oops on.

References

NVD — CVE-2026-63892 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63892
git.kernel.org/stable/c/37abc4504f... WEB
https://git.kernel.org/stable/c/37abc4504fa19d8f9f1e87792e8a2b8fdb308e40
git.kernel.org/stable/c/3bec49ca55... WEB
https://git.kernel.org/stable/c/3bec49ca55e08fb085cc4318f24b1b37eaab28cb
git.kernel.org/stable/c/542a13890b... WEB
https://git.kernel.org/stable/c/542a13890b742099c461d70920e97b14e568f6ec
git.kernel.org/stable/c/5506c825f1... WEB
https://git.kernel.org/stable/c/5506c825f14d810f0690b1f4367cb7249ebb387a
git.kernel.org/stable/c/d548179adc... WEB
https://git.kernel.org/stable/c/d548179adcc87e1bc66b17e00352a1f536e76065
git.kernel.org/stable/c/de21b59c29... WEB
https://git.kernel.org/stable/c/de21b59c29e31c5108ddc04210631bbfab81b997
git.kernel.org/stable/c/de61829919... WEB
https://git.kernel.org/stable/c/de618299190b418291609e6921557253bd417e25
git.kernel.org/stable/c/e2d4d51cf5... WEB
https://git.kernel.org/stable/c/e2d4d51cf5785815fa4e91e0c019e3eb2506a84c

Frequently Asked Questions

What is CVE-2026-63892?
CVE-2026-63892 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-2026-63892?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-63892?
CVE-2026-63892 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-63892?
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-c25w-638m-wrp7",
  "modified" : "2026-07-19T18:31:44Z",
  "published" : "2026-07-19T18:31:44Z",
  "aliases" : [ "CVE-2026-63892" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: property: Reject dir_len < 4 to prevent size_t underflow\n\nOn the non-root path, __tb_property_parse_dir() takes dir_len from\nentry->length (u16 widened to size_t).  Two distinct OOB conditions\nfollow when entry->length < 4:\n\n1. The non-root path begins with kmemdup(&block[dir_offset],\n   sizeof(*dir->uuid), ...) which always reads 4 dwords from\n   dir_offset.  tb_property_entry_valid() only enforces\n   dir_offset + entry->length <= block_len, so a crafted entry\n   with dir_offset close to the end of the property block and\n   entry->length in 0..3 passes that gate but lets the UUID copy\n   run off the block (e.g. dir_offset = 497, dir_len = 3 in a\n   500-dword block reads block[497..501]).\n\n2. After the kmemdup, content_len = dir_len - 4 underflows size_t\n   to ~SIZE_MAX, nentries becomes SIZE_MAX / 4, and the entry\n   walk runs OOB on each iteration until an entry fails\n   validation or the kernel oopses on an unmapped page.\n\nReject dir_len < 4 on the non-root path *before* the UUID kmemdup,\nwhich closes both holes.\n\nAlso move INIT_LIST_HEAD(&dir->properties) up to immediately after\nthe dir allocation so the new error-return path (and the existing\nuuid-alloc failure path) calling tb_property_free_dir() sees a\nwalkable list rather than the zero-initialized NULL next/prev that\nlist_for_each_entry_safe() would oops on.",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-63892"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/37abc4504fa19d8f9f1e87792e8a2b8fdb308e40"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/3bec49ca55e08fb085cc4318f24b1b37eaab28cb"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/542a13890b742099c461d70920e97b14e568f6ec"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/5506c825f14d810f0690b1f4367cb7249ebb387a"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/d548179adcc87e1bc66b17e00352a1f536e76065"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/de21b59c29e31c5108ddc04210631bbfab81b997"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/de618299190b418291609e6921557253bd417e25"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/e2d4d51cf5785815fa4e91e0c019e3eb2506a84c"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : null,
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-19T16:17:06Z"
  }
}