CVE-2026-64538: Software Security Vulnerability Vulnerability

UNKNOWN
Advisory Identifier: GHSA-c37c-frr8-rx54
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Advisory Summary

CVE-2026-64538 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-2026-64538 at a Glance

CVE Identifier CVE-2026-64538
GHSA Identifier GHSA-c37c-frr8-rx54
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-2026-64538

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-2026-64538, 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: Fix null-ptr-deref in fib6_nh_mtu_change(). fib6_nh_mtu_change() re-fetches idev via __in6_dev_get(arg->dev) and dereferences idev->cnf.mtu6 without a NULL check. addrconf_ifdown() clears dev->ip6_ptr with RCU_INIT_POINTER() after rt6_disable_ip() has released tb6_lock, so the RA-driven MTU walk can observe a NULL idev and oops. The caller rt6_mtu_change_route() guards its own __in6_dev_get(), but this re-fetch is unguarded; nexthop-backed routes survive addrconf_ifdown()'s flush, so the walk still reaches it after ip6_ptr is nulled. Return 0 when idev is NULL, matching rt6_mtu_change_route() and the fib6_mtu() fix in commit 5ad509c1fdad ("ipv6: Fix null-ptr-deref in fib6_mtu()."). Oops: general protection fault, ... KASAN: null-ptr-deref in range [0x00000000000002a8-0x00000000000002af] RIP: 0010:fib6_nh_mtu_change+0x203/0x990 rt6_mtu_change_route+0x141/0x1d0 __fib6_clean_all+0xd0/0x160 rt6_mtu_change+0xb4/0x100 ndisc_router_discovery+0x24b5/0x2cb0 icmpv6_rcv+0x12e9/0x1710 ipv6_rcv+0x39b/0x410

References

NVD — CVE-2026-64538 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-64538
cert-portal.siemens.com/productcert/html/ss... WEB
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
cert-portal.siemens.com/productcert/html/ss... WEB
https://cert-portal.siemens.com/productcert/html/ssa-457936.html
git.kernel.org/stable/c/1451deca98... WEB
https://git.kernel.org/stable/c/1451deca9896957159f0666520a792c1b861af4f
git.kernel.org/stable/c/302d57ed78... WEB
https://git.kernel.org/stable/c/302d57ed7872838b40e56a868fb4c7da7da606e9
git.kernel.org/stable/c/46c3b8191a... WEB
https://git.kernel.org/stable/c/46c3b8191aad3d032776bf3bebf03efdf5f4b905
git.kernel.org/stable/c/6428634f7a... WEB
https://git.kernel.org/stable/c/6428634f7a0b7878144b4925c37856bef3224967
git.kernel.org/stable/c/80600b5d0f... WEB
https://git.kernel.org/stable/c/80600b5d0f3ecb9324120dc95b5e915130f516c5
git.kernel.org/stable/c/b0d0eb13a0... WEB
https://git.kernel.org/stable/c/b0d0eb13a0441a8ebf4f227843deaf494f1e2c33
git.kernel.org/stable/c/b2c70dd332... WEB
https://git.kernel.org/stable/c/b2c70dd3326809429b709a9c7e9220d29923051a
git.kernel.org/stable/c/d08d019f2f... WEB
https://git.kernel.org/stable/c/d08d019f2f43a6f9a71e81868bbc326b3afaf37b

Frequently Asked Questions

What is CVE-2026-64538?
CVE-2026-64538 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-2026-64538?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-64538?
CVE-2026-64538 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-64538?
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-c37c-frr8-rx54",
  "modified" : "2026-10-15T03:36:22Z",
  "published" : "2026-07-27T21:31:26Z",
  "aliases" : [ "CVE-2026-64538" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: Fix null-ptr-deref in fib6_nh_mtu_change().\n\nfib6_nh_mtu_change() re-fetches idev via __in6_dev_get(arg->dev) and\ndereferences idev->cnf.mtu6 without a NULL check. addrconf_ifdown()\nclears dev->ip6_ptr with RCU_INIT_POINTER() after rt6_disable_ip() has\nreleased tb6_lock, so the RA-driven MTU walk can observe a NULL idev and\noops. The caller rt6_mtu_change_route() guards its own __in6_dev_get(),\nbut this re-fetch is unguarded; nexthop-backed routes survive\naddrconf_ifdown()'s flush, so the walk still reaches it after ip6_ptr is\nnulled.\n\nReturn 0 when idev is NULL, matching rt6_mtu_change_route() and the\nfib6_mtu() fix in commit 5ad509c1fdad (\"ipv6: Fix null-ptr-deref in\nfib6_mtu().\").\n\n  Oops: general protection fault, ... KASAN: null-ptr-deref in range\n        [0x00000000000002a8-0x00000000000002af]\n  RIP: 0010:fib6_nh_mtu_change+0x203/0x990\n   rt6_mtu_change_route+0x141/0x1d0\n   __fib6_clean_all+0xd0/0x160\n   rt6_mtu_change+0xb4/0x100\n   ndisc_router_discovery+0x24b5/0x2cb0\n   icmpv6_rcv+0x12e9/0x1710\n   ipv6_rcv+0x39b/0x410",
  "severity" : [ ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-64538"
  }, {
    "type" : "WEB",
    "url" : "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
  }, {
    "type" : "WEB",
    "url" : "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/1451deca9896957159f0666520a792c1b861af4f"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/302d57ed7872838b40e56a868fb4c7da7da606e9"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/46c3b8191aad3d032776bf3bebf03efdf5f4b905"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/6428634f7a0b7878144b4925c37856bef3224967"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/80600b5d0f3ecb9324120dc95b5e915130f516c5"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/b0d0eb13a0441a8ebf4f227843deaf494f1e2c33"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/b2c70dd3326809429b709a9c7e9220d29923051a"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/d08d019f2f43a6f9a71e81868bbc326b3afaf37b"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : null,
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-27T21:17:06Z"
  }
}