CVE-2026-81000: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-32hf-vhcc-85c2
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CVSS 7.8
Published
Advisory Summary

CVE-2026-81000 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-2026-81000 at a Glance

CVE Identifier CVE-2026-81000
GHSA Identifier GHSA-32hf-vhcc-85c2
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-2026-81000

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-2026-81000, 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: net: tun: bound receive headroom tun_get_user() uses tun->align both as skb headroom and when choosing how much packet data to keep linear. OVS can propagate an oversized headroom request from another port to TUN or TAP. When align is larger than the usable space in a one-page skb head, SKB_MAX_HEAD(align) underflows and the result becomes negative when stored in good_linear. That value later wraps when assigned to the size_t linear variable, and tun_alloc_skb() can place skb->data outside the allocated head. Bound the headroom stored by TUN to the one-page skb-head budget and the largest non-sentinel 16-bit skb header offset. Leave one linear byte for raw TUN and a complete Ethernet header for TAP, including NET_IP_ALIGN. Also pull the raw-TUN protocol byte and the TAP Ethernet header before accessing them, so these checks remain safe for nonlinear skbs supplied by other allocation paths.

References

NVD — CVE-2026-81000 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-81000
git.kernel.org/stable/c/010eee265d... WEB
https://git.kernel.org/stable/c/010eee265d6bd8769b6a523d2a0693d9b3f5df43
git.kernel.org/stable/c/0ada54ea63... WEB
https://git.kernel.org/stable/c/0ada54ea63e48b9c1608e917ccb7dfadbe86db28
git.kernel.org/stable/c/18ef24cdb2... WEB
https://git.kernel.org/stable/c/18ef24cdb2eba32e38f1d27f2d02b7b4212e8f76
git.kernel.org/stable/c/379d85c7f2... WEB
https://git.kernel.org/stable/c/379d85c7f25f3e05a428225e6b8a65613c6e9b9d
git.kernel.org/stable/c/447c930394... WEB
https://git.kernel.org/stable/c/447c9303942c439a117d9b76ce6d6e2116b38ee7
git.kernel.org/stable/c/708e87937d... WEB
https://git.kernel.org/stable/c/708e87937de93f445225c134a2e20519f9b4ce60
git.kernel.org/stable/c/ad715e7136... WEB
https://git.kernel.org/stable/c/ad715e713610d2d5473c3a6498c825ccecf26491
git.kernel.org/stable/c/e098d9cc88... WEB
https://git.kernel.org/stable/c/e098d9cc8859614a7f7baebc96e32a5a16b18ed2

Frequently Asked Questions

What is CVE-2026-81000?
CVE-2026-81000 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-2026-81000?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-81000?
CVE-2026-81000 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-2026-81000?
CVE-2026-81000 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-81000?
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-32hf-vhcc-85c2",
  "modified" : "2026-09-14T15:32:22Z",
  "published" : "2026-09-11T21:31:23Z",
  "aliases" : [ "CVE-2026-81000" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tun: bound receive headroom\n\ntun_get_user() uses tun->align both as skb headroom and when choosing how\nmuch packet data to keep linear. OVS can propagate an oversized headroom\nrequest from another port to TUN or TAP.\n\nWhen align is larger than the usable space in a one-page skb head,\nSKB_MAX_HEAD(align) underflows and the result becomes negative when stored\nin good_linear. That value later wraps when assigned to the size_t linear\nvariable, and tun_alloc_skb() can place skb->data outside the allocated\nhead.\n\nBound the headroom stored by TUN to the one-page skb-head budget and the\nlargest non-sentinel 16-bit skb header offset. Leave one linear byte for\nraw TUN and a complete Ethernet header for TAP, including NET_IP_ALIGN.\n\nAlso pull the raw-TUN protocol byte and the TAP Ethernet header before\naccessing them, so these checks remain safe for nonlinear skbs supplied by\nother allocation paths.",
  "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-2026-81000"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/010eee265d6bd8769b6a523d2a0693d9b3f5df43"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/0ada54ea63e48b9c1608e917ccb7dfadbe86db28"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/18ef24cdb2eba32e38f1d27f2d02b7b4212e8f76"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/379d85c7f25f3e05a428225e6b8a65613c6e9b9d"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/447c9303942c439a117d9b76ce6d6e2116b38ee7"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/708e87937de93f445225c134a2e20519f9b4ce60"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/ad715e713610d2d5473c3a6498c825ccecf26491"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/e098d9cc8859614a7f7baebc96e32a5a16b18ed2"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-11T20:19:07Z"
  }
}