CVE-2026-74493: Software Security Vulnerability Vulnerability

CRITICAL
Advisory Identifier: GHSA-xhjj-46q7-2hx6
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CVSS 9.8
Published
Advisory Summary

CVE-2026-74493 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-2026-74493 at a Glance

CVE Identifier CVE-2026-74493
GHSA Identifier GHSA-xhjj-46q7-2hx6
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-2026-74493

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-2026-74493, 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: net/smc: fix socket use-after-free during link group termination __smc_lgr_terminate() drops conns_lock after finding a connection in lgr->conns_all, but before taking a reference on its socket. The connection is embedded in the socket, and its registration reference protects it only while the connection remains in the tree. A concurrent close can unregister the connection and drop that reference, freeing the socket before the termination worker reaches sock_hold(). The race is reachable when close overlaps link group termination. Local stress testing reproduced the use-after-free and KASAN reported: BUG: KASAN: slab-use-after-free in __smc_lgr_terminate.part.0 [smc] Write of size 4 by task kworker/3:3 Workqueue: events smc_lgr_terminate_work [smc] __smc_lgr_terminate.part.0 [smc] The socket was allocated by smc_create(), freed through slab_free_after_rcu_debug(), and was followed by: refcount_t: addition on 0; use-after-free. __smc_lgr_terminate.part.0 [smc] Take the socket reference while conns_lock still protects the tree entry. The unregister path then cannot drop the last reference until termination has finished using the socket.

References

NVD — CVE-2026-74493 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-74493
git.kernel.org/stable/c/281c103a8e... WEB
https://git.kernel.org/stable/c/281c103a8eaed59001ce952f231df1b07674215a
git.kernel.org/stable/c/5a42f162b8... WEB
https://git.kernel.org/stable/c/5a42f162b857019a4c10ff687dc3bcdf51831865
git.kernel.org/stable/c/9fb17c95b8... WEB
https://git.kernel.org/stable/c/9fb17c95b8f0683570fca1fb2792264147af937a
git.kernel.org/stable/c/bea8dc14de... WEB
https://git.kernel.org/stable/c/bea8dc14de2d56aca749d368563e6888217710a5
git.kernel.org/stable/c/f0541a775d... WEB
https://git.kernel.org/stable/c/f0541a775d04c88e90ba448e35ce0d743512822a
git.kernel.org/stable/c/f621d6ebee... WEB
https://git.kernel.org/stable/c/f621d6ebeebb6374342571e4ddf45fdbc420f6cd
git.kernel.org/stable/c/f807a63d0d... WEB
https://git.kernel.org/stable/c/f807a63d0d95680c34f677700da9148a07d7c78f
git.kernel.org/stable/c/ff44f2df57... WEB
https://git.kernel.org/stable/c/ff44f2df57fb5560bdc75eb977867643e764a262

Frequently Asked Questions

What is CVE-2026-74493?
CVE-2026-74493 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-2026-74493?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-74493?
CVE-2026-74493 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-2026-74493?
CVE-2026-74493 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-74493?
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-xhjj-46q7-2hx6",
  "modified" : "2026-08-19T18:32:28Z",
  "published" : "2026-08-15T15:30:34Z",
  "aliases" : [ "CVE-2026-74493" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: fix socket use-after-free during link group termination\n\n__smc_lgr_terminate() drops conns_lock after finding a connection in\nlgr->conns_all, but before taking a reference on its socket. The connection\nis embedded in the socket, and its registration reference protects it only\nwhile the connection remains in the tree.\n\nA concurrent close can unregister the connection and drop that reference,\nfreeing the socket before the termination worker reaches sock_hold().\n\nThe race is reachable when close overlaps link group termination.\nLocal stress testing reproduced the use-after-free and KASAN reported:\n\n  BUG: KASAN: slab-use-after-free in __smc_lgr_terminate.part.0 [smc]\n  Write of size 4 by task kworker/3:3\n  Workqueue: events smc_lgr_terminate_work [smc]\n  __smc_lgr_terminate.part.0 [smc]\n\nThe socket was allocated by smc_create(), freed through\nslab_free_after_rcu_debug(), and was followed by:\n\n  refcount_t: addition on 0; use-after-free.\n  __smc_lgr_terminate.part.0 [smc]\n\nTake the socket reference while conns_lock still protects the tree entry.\nThe unregister path then cannot drop the last reference until termination\nhas finished using the socket.",
  "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-2026-74493"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/281c103a8eaed59001ce952f231df1b07674215a"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/5a42f162b857019a4c10ff687dc3bcdf51831865"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/9fb17c95b8f0683570fca1fb2792264147af937a"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/bea8dc14de2d56aca749d368563e6888217710a5"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/f0541a775d04c88e90ba448e35ce0d743512822a"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/f621d6ebeebb6374342571e4ddf45fdbc420f6cd"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/f807a63d0d95680c34f677700da9148a07d7c78f"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/ff44f2df57fb5560bdc75eb977867643e764a262"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "CRITICAL",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-08-15T13:17:54Z"
  }
}