CVE-2026-64390: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-pgh2-g34p-4j6m
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CVSS 8.8
Published
Advisory Summary

CVE-2026-64390 is a HIGH (CVSS 8.8) security vulnerability vulnerability (General Security Weakness) affecting Software libraries in the Maven ecosystem. Remediation is available in the latest vendor maintenance releases.

CVE-2026-64390 at a Glance

CVE Identifier CVE-2026-64390
GHSA Identifier GHSA-pgh2-g34p-4j6m
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification General Security Weakness
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 8.8

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
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-2026-64390

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-2026-64390, 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: ksmbd: track the connection owning a byte-range lock SMB2_LOCK adds each granted byte-range lock to both the file lock list and the lock list of the connection which handled the request. The final close and durable handle paths, however, remove the connection list entry while holding fp->conn->llist_lock. With SMB3 multichannel, the connection handling the LOCK request can be different from the connection which opened the file. The entry can therefore be removed under a different spinlock from the one protecting the list it belongs to. A concurrent traversal can then access freed struct ksmbd_lock and struct file_lock objects. Record the connection owning each lock's clist entry and hold a reference to it while the entry is linked. Use that connection and its llist_lock for unlock, rollback, close, and durable preserve. Durable reconnect assigns the new connection as the owner when publishing the locks again.

References

NVD — CVE-2026-64390 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-64390
git.kernel.org/stable/c/22d38cf75b... WEB
https://git.kernel.org/stable/c/22d38cf75b556c20b039743bdf3654d535b858be
git.kernel.org/stable/c/427faaa52b... WEB
https://git.kernel.org/stable/c/427faaa52b0b399940c1a88065a5c310d10dad15
git.kernel.org/stable/c/5fecc15a30... WEB
https://git.kernel.org/stable/c/5fecc15a30cb9ebd310f7b52c1ab607edcea78f6
git.kernel.org/stable/c/66eb364316... WEB
https://git.kernel.org/stable/c/66eb3643164e5e1029907793926c132f8b5c6148
git.kernel.org/stable/c/c1016dd1d8... WEB
https://git.kernel.org/stable/c/c1016dd1d8b2bcd1158bbaabe94a31bb7e7431fb
git.kernel.org/stable/c/ea5c9bf99f... WEB
https://git.kernel.org/stable/c/ea5c9bf99f626a15cc59f645dc895f2b3f01992e
git.kernel.org/stable/c/fe20d492a6... WEB
https://git.kernel.org/stable/c/fe20d492a69a6f79e637f438072b212e21ed3b78

Frequently Asked Questions

What is CVE-2026-64390?
CVE-2026-64390 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-2026-64390?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-64390?
CVE-2026-64390 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-64390?
CVE-2026-64390 is classified under General Security Weakness.
How can I check Maven dependencies for CVE-2026-64390?
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-pgh2-g34p-4j6m",
  "modified" : "2026-07-27T06:30:35Z",
  "published" : "2026-07-25T12:31:33Z",
  "aliases" : [ "CVE-2026-64390" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: track the connection owning a byte-range lock\n\nSMB2_LOCK adds each granted byte-range lock to both the file lock list\nand the lock list of the connection which handled the request.  The\nfinal close and durable handle paths, however, remove the connection\nlist entry while holding fp->conn->llist_lock.\n\nWith SMB3 multichannel, the connection handling the LOCK request can be\ndifferent from the connection which opened the file.  The entry can\ntherefore be removed under a different spinlock from the one protecting\nthe list it belongs to.  A concurrent traversal can then access freed\nstruct ksmbd_lock and struct file_lock objects.\n\nRecord the connection owning each lock's clist entry and hold a\nreference to it while the entry is linked.  Use that connection and its\nllist_lock for unlock, rollback, close, and durable preserve.  Durable\nreconnect assigns the new connection as the owner when publishing the\nlocks again.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
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  "database_specific" : {
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    "severity" : "HIGH",
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    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-25T10:17:22Z"
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}