CVE-2026-68302: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-9gq3-j787-cjhr
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CVSS 9.8
Published
Advisory Summary

CVE-2026-68302 is a CRITICAL (CVSS 9.8) security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-68302 at a Glance

CVE Identifier CVE-2026-68302
GHSA Identifier GHSA-9gq3-j787-cjhr
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 9.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
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-2026-68302

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-2026-68302, 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: amt: re-read skb header pointers after every pull Several AMT receive and transmit paths cache a pointer into the skb head (ip_hdr(), ipv6_hdr(), eth_hdr() or the AMT message header) and then call a helper that can reallocate that head before the cached pointer is used again. pskb_may_pull(), ip_mc_may_pull(), ipv6_mc_may_pull(), iptunnel_pull_header(), ip_mc_check_igmp() and ipv6_mc_check_mld() can all free the old head and move the data, so a pointer taken before the call dangles afterwards and the later access is a use-after-free of the freed head. The affected sites are: amt_rcv() caches ip_hdr() before amt_parse_type() pulls, then reads iph->saddr. amt_dev_xmit() caches ip_hdr()/ipv6_hdr() before ip_mc_check_igmp()/ ipv6_mc_check_mld() and pskb_may_pull(), then reads the group address. amt_multicast_data_handler() caches eth_hdr() before pskb_may_pull(), then writes the L2 header. amt_membership_query_handler() caches the AMT header, the outer and inner eth_hdr() and ip_hdr() before iptunnel_pull_header() and several pulls, then reads and writes them. amt_igmpv3_report_handler() and amt_mldv2_report_handler() cache ip_hdr()/ipv6_hdr() and the current group record and read the record count from the report header inside the record loop, across the *_mc_may_pull() calls. amt_update_handler() caches ip_hdr() and the AMT membership-update header before pskb_may_pull(), iptunnel_pull_header(), ip_mc_check_igmp() and the report handler, then reads iph->daddr and amtmu->nonce / amtmu->response_mac. Fix each site by either snapshotting the scalar that is used after the pull before the first pull runs, or re-deriving the header pointer from the skb after the last pull that can move the head. Values that are stable across the pull (source and group address, the response MAC and nonce, the record count, the outer source MAC) are snapshotted; pointers that are written through or read repeatedly are re-derived.

References

NVD — CVE-2026-68302 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-68302
git.kernel.org/stable/c/3656a79f94... WEB
https://git.kernel.org/stable/c/3656a79f94c471827a08f2cacce5f94ad5e52c24
git.kernel.org/stable/c/37ff890f9c... WEB
https://git.kernel.org/stable/c/37ff890f9c18dfbcf57e17199901d4fd1e4c174e
git.kernel.org/stable/c/7746d588d4... WEB
https://git.kernel.org/stable/c/7746d588d42a4ac0117b68ed8e9b22a9da53dfb7
git.kernel.org/stable/c/7f48e3ddad... WEB
https://git.kernel.org/stable/c/7f48e3ddad8e97545b25788b8203b3a539df1621
git.kernel.org/stable/c/9005b221cb... WEB
https://git.kernel.org/stable/c/9005b221cb1f9c3c1a2ef656fb0e8fa80c0a187e
git.kernel.org/stable/c/ca0e8b6619... WEB
https://git.kernel.org/stable/c/ca0e8b661957f777591efe874cd9d9a63619cd99

Frequently Asked Questions

What is CVE-2026-68302?
CVE-2026-68302 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-2026-68302?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-68302?
CVE-2026-68302 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-68302?
CVE-2026-68302 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-68302?
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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  "id" : "GHSA-9gq3-j787-cjhr",
  "modified" : "2026-08-19T18:32:13Z",
  "published" : "2026-08-10T15:33:45Z",
  "aliases" : [ "CVE-2026-68302" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\namt: re-read skb header pointers after every pull\n\nSeveral AMT receive and transmit paths cache a pointer into the skb head\n(ip_hdr(), ipv6_hdr(), eth_hdr() or the AMT message header) and then call\na helper that can reallocate that head before the cached pointer is used\nagain.  pskb_may_pull(), ip_mc_may_pull(), ipv6_mc_may_pull(),\niptunnel_pull_header(), ip_mc_check_igmp() and ipv6_mc_check_mld() can all\nfree the old head and move the data, so a pointer taken before the call\ndangles afterwards and the later access is a use-after-free of the freed\nhead.\n\nThe affected sites are:\n\n  amt_rcv() caches ip_hdr() before amt_parse_type() pulls, then reads\n  iph->saddr.\n\n  amt_dev_xmit() caches ip_hdr()/ipv6_hdr() before ip_mc_check_igmp()/\n  ipv6_mc_check_mld() and pskb_may_pull(), then reads the group address.\n\n  amt_multicast_data_handler() caches eth_hdr() before pskb_may_pull(),\n  then writes the L2 header.\n\n  amt_membership_query_handler() caches the AMT header, the outer and\n  inner eth_hdr() and ip_hdr() before iptunnel_pull_header() and several\n  pulls, then reads and writes them.\n\n  amt_igmpv3_report_handler() and amt_mldv2_report_handler() cache\n  ip_hdr()/ipv6_hdr() and the current group record and read the record\n  count from the report header inside the record loop, across the\n  *_mc_may_pull() calls.\n\n  amt_update_handler() caches ip_hdr() and the AMT membership-update\n  header before pskb_may_pull(), iptunnel_pull_header(),\n  ip_mc_check_igmp() and the report handler, then reads iph->daddr and\n  amtmu->nonce / amtmu->response_mac.\n\nFix each site by either snapshotting the scalar that is used after the\npull before the first pull runs, or re-deriving the header pointer from\nthe skb after the last pull that can move the head.  Values that are\nstable across the pull (source and group address, the response MAC and\nnonce, the record count, the outer source MAC) are snapshotted; pointers\nthat are written through or read repeatedly are re-derived.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
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    "url" : "https://git.kernel.org/stable/c/3656a79f94c471827a08f2cacce5f94ad5e52c24"
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    "type" : "WEB",
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  }, {
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    "url" : "https://git.kernel.org/stable/c/7746d588d42a4ac0117b68ed8e9b22a9da53dfb7"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/7f48e3ddad8e97545b25788b8203b3a539df1621"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/9005b221cb1f9c3c1a2ef656fb0e8fa80c0a187e"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/ca0e8b661957f777591efe874cd9d9a63619cd99"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-10T13:20:19Z"
  }
}