CVE-2026-64047: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-25cm-2563-466g
Share
CVSS 9.8
CWE-191 CWE-193
Published
Advisory Summary

CVE-2026-64047 is a CRITICAL (CVSS 9.8) security vulnerability vulnerability (CWE-191: Integer Underflow (Wrap or Wraparound)) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-64047 at a Glance

CVE Identifier CVE-2026-64047
GHSA Identifier GHSA-25cm-2563-466g
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-191: Integer Underflow (Wrap or Wraparound)
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-2026-64047

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-2026-64047, 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-191: Integer Underflow (Wrap or Wraparound), where the product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. 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: net: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring When an sk_msg scatterlist ring wraps (sg.end < sg.start), tls_push_record() chains the tail portion of the ring to the head using sg_chain(). An extra entry in the sg array is reserved for this: struct sk_msg_sg { [...] /* The extra two elements: * 1) used for chaining the front and sections when the list becomes * partitioned (e.g. end < start). The crypto APIs require the * chaining; * 2) to chain tailer SG entries after the message. */ struct scatterlist data[MAX_MSG_FRAGS + 2]; The current code uses MAX_SKB_FRAGS + 1 as the ring size: sg_chain(&msg_pl->sg.data[msg_pl->sg.start], MAX_SKB_FRAGS - msg_pl->sg.start + 1, msg_pl->sg.data); This places the chain pointer at sg_chain(data[start], (MAX_SKB_FRAGS - msg_start + 1) .. = &data[start] + (MAX_SKB_FRAGS - msg_start + 1) - 1 = data[start + (MAX_SKB_FRAGS - start + 1) - 1] = data[MAX_SKB_FRAGS] instead of the true last entry. This is likely due to a "race" of the commit under Fixes landing close to commit 031097d9e079 ("bpf: sk_msg, zap ingress queue on psock down") Convert to ARRAY_SIZE and drop the data[start] / - start (as suggested by Sabrina).

References

NVD — CVE-2026-64047 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-64047
git.kernel.org/stable/c/131ef12057... WEB
https://git.kernel.org/stable/c/131ef12057d92b77b636321b7849c69222405a97
git.kernel.org/stable/c/285943c6e7... WEB
https://git.kernel.org/stable/c/285943c6e7ca309bbea84b253745154241d9788a
git.kernel.org/stable/c/2fb0dc7e00... WEB
https://git.kernel.org/stable/c/2fb0dc7e0099686c4e9d2732745d8a31b18c3628
git.kernel.org/stable/c/47110c3a9a... WEB
https://git.kernel.org/stable/c/47110c3a9ac247b688657337f5981efcfcb240dc
git.kernel.org/stable/c/66339b71f1... WEB
https://git.kernel.org/stable/c/66339b71f105e6f83e0da3b9583d95077534fe1d
git.kernel.org/stable/c/73963a3758... WEB
https://git.kernel.org/stable/c/73963a375885d5ccb7def39fd0b4f542e0f343dd
git.kernel.org/stable/c/84158c2997... WEB
https://git.kernel.org/stable/c/84158c2997159df4a0d70cd9c46774512d32a522
git.kernel.org/stable/c/eca989eab4... WEB
https://git.kernel.org/stable/c/eca989eab4b2599dcb02f72140a7c08f08838520

Frequently Asked Questions

What is CVE-2026-64047?
CVE-2026-64047 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-191: Integer Underflow (Wrap or Wraparound).
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-64047?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-64047?
CVE-2026-64047 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-2026-64047?
CVE-2026-64047 is classified under CWE-191: Integer Underflow (Wrap or Wraparound) (The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.).
How can I check Maven dependencies for CVE-2026-64047?
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-25cm-2563-466g",
  "modified" : "2026-07-20T15:31:57Z",
  "published" : "2026-07-19T18:31:50Z",
  "aliases" : [ "CVE-2026-64047" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring\n\nWhen an sk_msg scatterlist ring wraps (sg.end < sg.start),\ntls_push_record() chains the tail portion of the ring to the head\nusing sg_chain(). An extra entry in the sg array is reserved for\nthis:\n\n  struct sk_msg_sg {\n        [...]\n        /* The extra two elements:\n         * 1) used for chaining the front and sections when the list becomes\n         *    partitioned (e.g. end < start). The crypto APIs require the\n         *    chaining;\n         * 2) to chain tailer SG entries after the message.\n         */\n        struct scatterlist              data[MAX_MSG_FRAGS + 2];\n\nThe current code uses MAX_SKB_FRAGS + 1 as the ring size:\n\n    sg_chain(&msg_pl->sg.data[msg_pl->sg.start],\n             MAX_SKB_FRAGS - msg_pl->sg.start + 1,\n             msg_pl->sg.data);\n\nThis places the chain pointer at\n\n  sg_chain(data[start], (MAX_SKB_FRAGS - msg_start + 1) .. =\n  &data[start] + (MAX_SKB_FRAGS - msg_start + 1) - 1 =\n  data[start + (MAX_SKB_FRAGS - start + 1) - 1] =\n  data[MAX_SKB_FRAGS]\n\ninstead of the true last entry. This is likely due to a \"race\" of\nthe commit under Fixes landing close to\ncommit 031097d9e079 (\"bpf: sk_msg, zap ingress queue on psock down\")\n\nConvert to ARRAY_SIZE and drop the data[start] / - start (as suggested\nby Sabrina).",
  "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" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-64047"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/131ef12057d92b77b636321b7849c69222405a97"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/285943c6e7ca309bbea84b253745154241d9788a"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/2fb0dc7e0099686c4e9d2732745d8a31b18c3628"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/47110c3a9ac247b688657337f5981efcfcb240dc"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/66339b71f105e6f83e0da3b9583d95077534fe1d"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/73963a375885d5ccb7def39fd0b4f542e0f343dd"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/84158c2997159df4a0d70cd9c46774512d32a522"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/eca989eab4b2599dcb02f72140a7c08f08838520"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-191", "CWE-193" ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-19T16:17:45Z"
  }
}