CVE-2026-80839: Software Security Vulnerability Vulnerability

UNKNOWN
Advisory Identifier: GHSA-676r-cqgf-36vf
Share
Published
Advisory Summary

CVE-2026-80839 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-2026-80839 at a Glance

CVE Identifier CVE-2026-80839
GHSA Identifier GHSA-676r-cqgf-36vf
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-2026-80839

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-2026-80839, 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: batman-adv: reject unrepresentable multicast TVLV offsets The network and transport header fields in struct sk_buff are 16-bit offsets from skb->head, and U16_MAX is reserved as the unset transport header value. batadv_tvlv_call_handler() sets both fields from a received multicast TVLV without checking whether the TVLV end is representable. If the end offset exceeds the field's range, skb_set_transport_header() truncates it so that the transport header precedes the network header. The negative difference is then returned by skb_network_header_len() as a large u32. batadv_mcast_forw_packet() consequently accepts an oversized multicast tracker and accesses memory beyond the skb data. Add skb_set_transport_header_careful(), an offset-aware counterpart to skb_reset_transport_header_careful(), which validates the final head-relative offset before assigning it. Use the new helper in batadv_tvlv_call_handler() and reject unrepresentable TVLVs before setting the network header.

References

NVD — CVE-2026-80839 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-80839
git.kernel.org/stable/c/1b466746fe... WEB
https://git.kernel.org/stable/c/1b466746fe109127fd983100a228cdd1f1f6ece2
git.kernel.org/stable/c/2b46baa591... WEB
https://git.kernel.org/stable/c/2b46baa591d0a7c16b62f150917187e70d053be6
git.kernel.org/stable/c/916ec741e6... WEB
https://git.kernel.org/stable/c/916ec741e65af072b98e475feaad98c063da1b7c
git.kernel.org/stable/c/da1f5aa7ec... WEB
https://git.kernel.org/stable/c/da1f5aa7ec93f2cc17f5cd30efc54f62af433cf2
git.kernel.org/stable/c/f12c2de4f5... WEB
https://git.kernel.org/stable/c/f12c2de4f542e3220e17e0606f492110064f04cb

Frequently Asked Questions

What is CVE-2026-80839?
CVE-2026-80839 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-2026-80839?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-80839?
CVE-2026-80839 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-80839?
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-676r-cqgf-36vf",
  "modified" : "2026-09-04T18:31:28Z",
  "published" : "2026-09-04T18:31:28Z",
  "aliases" : [ "CVE-2026-80839" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: reject unrepresentable multicast TVLV offsets\n\nThe network and transport header fields in struct sk_buff are 16-bit\noffsets from skb->head, and U16_MAX is reserved as the unset transport\nheader value. batadv_tvlv_call_handler() sets both fields from a received\nmulticast TVLV without checking whether the TVLV end is representable.\n\nIf the end offset exceeds the field's range, skb_set_transport_header()\ntruncates it so that the transport header precedes the network header.\nThe negative difference is then returned by skb_network_header_len() as\na large u32. batadv_mcast_forw_packet() consequently accepts an oversized\nmulticast tracker and accesses memory beyond the skb data.\n\nAdd skb_set_transport_header_careful(), an offset-aware counterpart to\nskb_reset_transport_header_careful(), which validates the final\nhead-relative offset before assigning it. Use the new helper in\nbatadv_tvlv_call_handler() and reject unrepresentable TVLVs before\nsetting the network header.",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-80839"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/1b466746fe109127fd983100a228cdd1f1f6ece2"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/2b46baa591d0a7c16b62f150917187e70d053be6"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/916ec741e65af072b98e475feaad98c063da1b7c"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/da1f5aa7ec93f2cc17f5cd30efc54f62af433cf2"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/f12c2de4f542e3220e17e0606f492110064f04cb"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : null,
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-04T16:18:12Z"
  }
}