CVE-2026-53264: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-vq3g-6qwh-5wj2
Share
CVSS 7.8
CWE-416
Published
Advisory Summary

CVE-2026-53264 is a HIGH (CVSS 7.8) security vulnerability vulnerability (CWE-416: Use After Free) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product reuses or references memory after it has been freed. at some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-53264 at a Glance

CVE Identifier CVE-2026-53264
GHSA Identifier GHSA-vq3g-6qwh-5wj2
Severity HIGH
CVSS v3.1 Base Score 7.8
CWE Classification CWE-416: Use After Free
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.8

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

Attack Vector Local (AV:L)
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-2026-53264

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-2026-53264, 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-416: Use After Free, where the product reuses or references memory after it has been freed. at some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer. 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/sched: act_api: use RCU with deferred freeing for action lifecycle When NEWTFILTER and DELFILTER are run concurrently it is possible to create a race with an associated action. Let's illustrate with CPU0 running NEWTFILTER and CPU1 running DELFILTER: 0: mutex_lock() <-- holds the idr lock 0: rcu_read_lock() 0: p = idr_find(idr, index) <-- action p is valid (RCU protects IDR) 0: mutex_unlock() <-- releases the idr lock 1: refcount_dec_and_mutex_lock() <-- refcnt 1->0, mutex held 1: idr_remove(idr, index) <-- Action removed from IDR 1: mutex_unlock() <-- mutex released allowing us to delete the action 1: tcf_action_cleanup(p); kfree(p) <-- Kfrees p immediately, no deferral 0: refcount_inc_not_zero(&p->tcfa_refcnt) <-- ouch, UAF p points to freed memory This patch fixes the race condition between NEWTFILTER and DELFILTER by adding struct rcu_head to tc_action used in the deferral and introducing a call_rcu() in the delete path to defer the final kfree(). Note: this is a revert of commit d7fb60b9cafb ("net_sched: get rid of tcfa_rcu") but also modernization/simplification to directly use kfree_rcu(). Let's illustrate the new restored code path: 0: rcu_read_lock() 1: refcount_dec_and_mutex_lock() <-- refcnt 1->0, mutex held 1: idr_remove(idr, index) 1: mutex_unlock() 1: call_rcu(&p->tcfa_rcu, tcf_action_rcu_free) <-- defer kfree after grace period 0: p = idr_find(idr, index) 0: refcount_inc_not_zero(&p->tcfa_refcnt) <-- fails, refcnt already 0 1: rcu_read_unlock() <-- release so freeing can run after grace period After CPU1 calls idr_remove(), the object is no longer reachable through the IDR. CPU0's subsequent idr_find() will return NULL, and even if it still held a stale pointer, the immediate kfree() is now deferred until after the RCU grace period, so no UAF can occur.

References

NVD — CVE-2026-53264 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-53264
cert-portal.siemens.com/productcert/html/ss... WEB
https://cert-portal.siemens.com/productcert/html/ssa-784472.html
git.kernel.org/stable/c/18af5d2ef0... WEB
https://git.kernel.org/stable/c/18af5d2ef0c4f65787fd1280c8b23286b9f2a835
git.kernel.org/stable/c/1f1b98fea6... WEB
https://git.kernel.org/stable/c/1f1b98fea6b9ea30507d0f2fbff6750292d097e2
git.kernel.org/stable/c/5057e1aca0... WEB
https://git.kernel.org/stable/c/5057e1aca011e51ef51498c940ef96f3d3e8a305
git.kernel.org/stable/c/5dd51e0902... WEB
https://git.kernel.org/stable/c/5dd51e09020c65aa53cf128e5e3517cd53b3c113
git.kernel.org/stable/c/8b136f18ac... WEB
https://git.kernel.org/stable/c/8b136f18ac4b2ace5aaad3305b3f8a5d8165a009
git.kernel.org/stable/c/91d105d2cb... WEB
https://git.kernel.org/stable/c/91d105d2cbe002f9c7b43a6183adedc37e1da1f7
git.kernel.org/stable/c/98b2e40879... WEB
https://git.kernel.org/stable/c/98b2e40879abf0245be5a5b7af69e0f6ff524ac3
git.kernel.org/stable/c/b60e939114... WEB
https://git.kernel.org/stable/c/b60e9391142e983fab2be53497aa8f71fdd09cd5
starlabs.sg/blog/2026/07-when-a... WEB
https://starlabs.sg/blog/2026/07-when-ai-makes-0-days-feel-like-n-days

Frequently Asked Questions

What is CVE-2026-53264?
CVE-2026-53264 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-416: Use After Free.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-53264?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-53264?
CVE-2026-53264 has a CVSS v3.1 base score of 7.8 (HIGH) with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-53264?
CVE-2026-53264 is classified under CWE-416: Use After Free (The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.).
How can I check Maven dependencies for CVE-2026-53264?
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-vq3g-6qwh-5wj2",
  "modified" : "2026-10-15T03:36:18Z",
  "published" : "2026-06-25T09:31:23Z",
  "aliases" : [ "CVE-2026-53264" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_api: use RCU with deferred freeing for action lifecycle\n\nWhen NEWTFILTER and DELFILTER are run concurrently it is possible to create a\nrace with an associated action.\n\nLet's illustrate with CPU0 running NEWTFILTER and CPU1 running DELFILTER:\n\n 0: mutex_lock() <-- holds the idr lock\n 0: rcu_read_lock()\n 0: p = idr_find(idr, index) <-- action p is valid (RCU protects IDR)\n 0: mutex_unlock() <-- releases the idr lock\n 1: refcount_dec_and_mutex_lock() <-- refcnt 1->0, mutex held\n 1: idr_remove(idr, index) <-- Action removed from IDR\n 1: mutex_unlock() <-- mutex released allowing us to delete the action\n 1: tcf_action_cleanup(p); kfree(p) <-- Kfrees p immediately, no deferral\n 0: refcount_inc_not_zero(&p->tcfa_refcnt) <-- ouch, UAF p points to freed memory\n\nThis patch fixes the race condition between NEWTFILTER and DELFILTER by\nadding struct rcu_head to tc_action used in the deferral and introducing a\ncall_rcu() in the delete path to defer the final kfree().\n\nNote: this is a revert of commit d7fb60b9cafb (\"net_sched: get rid of tcfa_rcu\")\nbut also modernization/simplification to directly use kfree_rcu().\n\nLet's illustrate the new restored code path:\n\n 0: rcu_read_lock()\n 1: refcount_dec_and_mutex_lock() <-- refcnt 1->0, mutex held\n 1: idr_remove(idr, index)\n 1: mutex_unlock()\n 1: call_rcu(&p->tcfa_rcu, tcf_action_rcu_free) <-- defer kfree after grace period\n 0: p = idr_find(idr, index)\n 0: refcount_inc_not_zero(&p->tcfa_refcnt) <-- fails, refcnt already 0\n 1: rcu_read_unlock() <-- release so freeing can run after grace period\n\nAfter CPU1 calls idr_remove(), the object is no longer reachable through the IDR.\nCPU0's subsequent idr_find() will return NULL, and even if it still held a\nstale pointer, the immediate kfree() is now deferred until after the RCU grace\nperiod, so no UAF can occur.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-53264"
  }, {
    "type" : "WEB",
    "url" : "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/18af5d2ef0c4f65787fd1280c8b23286b9f2a835"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/1f1b98fea6b9ea30507d0f2fbff6750292d097e2"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/5057e1aca011e51ef51498c940ef96f3d3e8a305"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/5dd51e09020c65aa53cf128e5e3517cd53b3c113"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/8b136f18ac4b2ace5aaad3305b3f8a5d8165a009"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/91d105d2cbe002f9c7b43a6183adedc37e1da1f7"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/98b2e40879abf0245be5a5b7af69e0f6ff524ac3"
  }, {
    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/b60e9391142e983fab2be53497aa8f71fdd09cd5"
  }, {
    "type" : "WEB",
    "url" : "https://starlabs.sg/blog/2026/07-when-ai-makes-0-days-feel-like-n-days"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-416" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-06-25T09:16:44Z"
  }
}