CVE-2026-64542: Software Security Vulnerability Vulnerability

UNKNOWN
Advisory Identifier: GHSA-f33q-wfg9-j2hv
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Advisory Summary

CVE-2026-64542 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-2026-64542 at a Glance

CVE Identifier CVE-2026-64542
GHSA Identifier GHSA-f33q-wfg9-j2hv
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-2026-64542

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-2026-64542, 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: ipv6: ndisc: fix NULL deref in accept_untracked_na() accept_untracked_na() re-fetches the inet6_dev with __in6_dev_get(dev) and dereferences idev->cnf.accept_untracked_na without a NULL check, even though its only caller ndisc_recv_na() already fetched and NULL-checked idev for the same device. Both reads of dev->ip6_ptr run in the same RCU read-side critical section, but a concurrent addrconf_ifdown() can clear dev->ip6_ptr between them: lowering the MTU below IPV6_MIN_MTU calls addrconf_ifdown() without the synchronize_net() that orders the unregister path, so the re-fetch returns NULL and oopses: BUG: KASAN: null-ptr-deref in ndisc_recv_na (net/ipv6/ndisc.c:974) Read of size 4 at addr 0000000000000364 Call Trace: <IRQ> ndisc_recv_na (net/ipv6/ndisc.c:974) icmpv6_rcv (net/ipv6/icmp.c:1193) ip6_protocol_deliver_rcu (net/ipv6/ip6_input.c:479) ip6_input_finish (net/ipv6/ip6_input.c:534) ip6_input (net/ipv6/ip6_input.c:545) ip6_mc_input (net/ipv6/ip6_input.c:635) ipv6_rcv (net/ipv6/ip6_input.c:351) </IRQ> It is reachable by an unprivileged user via a network namespace. Pass the caller's already validated idev instead of re-fetching it; the idev stays alive for the whole RCU critical section, so it is safe even after dev->ip6_ptr has been cleared.

References

NVD — CVE-2026-64542 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-64542
git.kernel.org/stable/c/160d3f0d7a... WEB
https://git.kernel.org/stable/c/160d3f0d7a556ceae505dcab521a37057b4ce28f
git.kernel.org/stable/c/62c719203c... WEB
https://git.kernel.org/stable/c/62c719203cb521b64fab74da94a81bdde5c18808
git.kernel.org/stable/c/63d1c23764... WEB
https://git.kernel.org/stable/c/63d1c23764de2309cedbb779c75188d257a09d9b
git.kernel.org/stable/c/a6450f7cfa... WEB
https://git.kernel.org/stable/c/a6450f7cfae57b382cbaf66a577765c9a88b3c58
git.kernel.org/stable/c/d186e94236... WEB
https://git.kernel.org/stable/c/d186e942365acece7c56d39da05dd63bf95b280a
git.kernel.org/stable/c/e5ba3017e4... WEB
https://git.kernel.org/stable/c/e5ba3017e46f275ad347e762e8eecacec5efa41d

Frequently Asked Questions

What is CVE-2026-64542?
CVE-2026-64542 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-2026-64542?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-64542?
CVE-2026-64542 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-64542?
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-f33q-wfg9-j2hv",
  "modified" : "2026-08-19T18:32:01Z",
  "published" : "2026-07-27T21:31:26Z",
  "aliases" : [ "CVE-2026-64542" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: ndisc: fix NULL deref in accept_untracked_na()\n\naccept_untracked_na() re-fetches the inet6_dev with __in6_dev_get(dev)\nand dereferences idev->cnf.accept_untracked_na without a NULL check,\neven though its only caller ndisc_recv_na() already fetched and\nNULL-checked idev for the same device.\n\nBoth reads of dev->ip6_ptr run in the same RCU read-side critical\nsection, but a concurrent addrconf_ifdown() can clear dev->ip6_ptr\nbetween them: lowering the MTU below IPV6_MIN_MTU calls addrconf_ifdown()\nwithout the synchronize_net() that orders the unregister path, so the\nre-fetch returns NULL and oopses:\n\n BUG: KASAN: null-ptr-deref in ndisc_recv_na (net/ipv6/ndisc.c:974)\n Read of size 4 at addr 0000000000000364\n Call Trace:\n  <IRQ>\n  ndisc_recv_na (net/ipv6/ndisc.c:974)\n  icmpv6_rcv (net/ipv6/icmp.c:1193)\n  ip6_protocol_deliver_rcu (net/ipv6/ip6_input.c:479)\n  ip6_input_finish (net/ipv6/ip6_input.c:534)\n  ip6_input (net/ipv6/ip6_input.c:545)\n  ip6_mc_input (net/ipv6/ip6_input.c:635)\n  ipv6_rcv (net/ipv6/ip6_input.c:351)\n  </IRQ>\n\nIt is reachable by an unprivileged user via a network namespace.\n\nPass the caller's already validated idev instead of re-fetching it; the\nidev stays alive for the whole RCU critical section, so it is safe even\nafter dev->ip6_ptr has been cleared.",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-64542"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/160d3f0d7a556ceae505dcab521a37057b4ce28f"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/62c719203cb521b64fab74da94a81bdde5c18808"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/63d1c23764de2309cedbb779c75188d257a09d9b"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/a6450f7cfae57b382cbaf66a577765c9a88b3c58"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/d186e942365acece7c56d39da05dd63bf95b280a"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/e5ba3017e46f275ad347e762e8eecacec5efa41d"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : null,
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-27T21:17:06Z"
  }
}