CVE-2026-68121: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-7hvc-v975-w6v4
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CVSS 7.8
CWE-416
Published
Advisory Summary

CVE-2026-68121 is a HIGH (CVSS 7.8) security vulnerability vulnerability (CWE-416: Use After Free) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product reuses or references memory after it has been freed. at some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-68121 at a Glance

CVE Identifier CVE-2026-68121
GHSA Identifier GHSA-7hvc-v975-w6v4
Severity HIGH
CVSS v3.1 Base Score 7.8
CWE Classification CWE-416: Use After Free
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-2026-68121

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-2026-68121, 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-416: Use After Free, where the product reuses or references memory after it has been freed. at some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer. 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: pppoe: reload header pointer after dev_hard_header() pppoe_sendmsg() saves a pointer to the PPPoE header before calling dev_hard_header(). Device header callbacks are allowed to reallocate the skb head, invalidating pointers into it. This can happen when a send is blocked in copy_from_user() while the first non-Ethernet port is added to an empty team device. The team's delegated GRE header callback then expands the skb head. PPPoE subsequently writes six bytes through the stale pointer into the freed head. Reload the PPPoE header through the skb's network-header offset after device header creation. pskb_expand_head() updates that offset when it relocates the head.

References

NVD — CVE-2026-68121 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-68121
git.kernel.org/stable/c/6866abf599... WEB
https://git.kernel.org/stable/c/6866abf59976d273164a6624234d96a967280223
git.kernel.org/stable/c/6eed5ae788... WEB
https://git.kernel.org/stable/c/6eed5ae7887a93160803d2b81ff88e75eefd4a4c
git.kernel.org/stable/c/7a56e7c9b0... WEB
https://git.kernel.org/stable/c/7a56e7c9b08e08fd55a1bcada24cf4fe3782b722
git.kernel.org/stable/c/7e9fbd7f96... WEB
https://git.kernel.org/stable/c/7e9fbd7f96bcde63a7c798fe16b38cedee7a1501
git.kernel.org/stable/c/ba3409369c... WEB
https://git.kernel.org/stable/c/ba3409369c5413cdf0dcbf3a928f76b48e8c3e6a
git.kernel.org/stable/c/bed4caecd7... WEB
https://git.kernel.org/stable/c/bed4caecd723693f750e13adbb2c42ca1249a3fd
git.kernel.org/stable/c/e6493a4d1e... WEB
https://git.kernel.org/stable/c/e6493a4d1ee17595766165fa446d45b7e0c318d0
git.kernel.org/stable/c/e9c238f6fe... WEB
https://git.kernel.org/stable/c/e9c238f6fe42fb1b4dba3a578277de32cb487937

Frequently Asked Questions

What is CVE-2026-68121?
CVE-2026-68121 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-416: Use After Free.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-68121?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-68121?
CVE-2026-68121 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-2026-68121?
CVE-2026-68121 is classified under CWE-416: Use After Free (The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.).
How can I check Maven dependencies for CVE-2026-68121?
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 
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  "published" : "2026-08-10T15:33:36Z",
  "aliases" : [ "CVE-2026-68121" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\npppoe: reload header pointer after dev_hard_header()\n\npppoe_sendmsg() saves a pointer to the PPPoE header before calling\ndev_hard_header(). Device header callbacks are allowed to reallocate the\nskb head, invalidating pointers into it.\n\nThis can happen when a send is blocked in copy_from_user() while the first\nnon-Ethernet port is added to an empty team device. The team's delegated\nGRE header callback then expands the skb head. PPPoE subsequently writes\nsix bytes through the stale pointer into the freed head.\n\nReload the PPPoE header through the skb's network-header offset after\ndevice header creation. pskb_expand_head() updates that offset when it\nrelocates the head.",
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}