CVE-2026-23111: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-jh9m-9mr6-3ghc
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CVSS 7.8
CWE-672 CWE-416
Published
Advisory Summary

CVE-2026-23111 is a HIGH (CVSS 7.8) security vulnerability vulnerability (CWE-672: Operation on a Resource after Expiration or Release) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product uses, accesses, or otherwise operates on a resource after that resource has been expired, released, or revoked.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-23111 at a Glance

CVE Identifier CVE-2026-23111
GHSA Identifier GHSA-jh9m-9mr6-3ghc
Severity HIGH
CVSS v3.1 Base Score 7.8
CWE Classification CWE-672: Operation on a Resource after Expiration or Release
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-2026-23111

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-2026-23111, 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-672: Operation on a Resource after Expiration or Release, where the product uses, accesses, or otherwise operates on a resource after that resource has been expired, released, or revoked. 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: netfilter: nf_tables: fix inverted genmask check in nft_map_catchall_activate() nft_map_catchall_activate() has an inverted element activity check compared to its non-catchall counterpart nft_mapelem_activate() and compared to what is logically required. nft_map_catchall_activate() is called from the abort path to re-activate catchall map elements that were deactivated during a failed transaction. It should skip elements that are already active (they don't need re-activation) and process elements that are inactive (they need to be restored). Instead, the current code does the opposite: it skips inactive elements and processes active ones. Compare the non-catchall activate callback, which is correct: nft_mapelem_activate(): if (nft_set_elem_active(ext, iter->genmask)) return 0; /* skip active, process inactive */ With the buggy catchall version: nft_map_catchall_activate(): if (!nft_set_elem_active(ext, genmask)) continue; /* skip inactive, process active */ The consequence is that when a DELSET operation is aborted, nft_setelem_data_activate() is never called for the catchall element. For NFT_GOTO verdict elements, this means nft_data_hold() is never called to restore the chain->use reference count. Each abort cycle permanently decrements chain->use. Once chain->use reaches zero, DELCHAIN succeeds and frees the chain while catchall verdict elements still reference it, resulting in a use-after-free. This is exploitable for local privilege escalation from an unprivileged user via user namespaces + nftables on distributions that enable CONFIG_USER_NS and CONFIG_NF_TABLES. Fix by removing the negation so the check matches nft_mapelem_activate(): skip active elements, process inactive ones.

References

NVD — CVE-2026-23111 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-23111
Software Security Information SECURITY
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23111.json
git.kernel.org/stable/c/f41c5d1510... WEB
https://git.kernel.org/stable/c/f41c5d151078c5348271ffaf8e7410d96f2d82f8
git.kernel.org/stable/c/b9b6573421... WEB
https://git.kernel.org/stable/c/b9b6573421de51829f7ec1cce76d85f5f6fbbd7f
git.kernel.org/stable/c/8c760ba4e3... WEB
https://git.kernel.org/stable/c/8c760ba4e36c750379d13569f23f5a6e185333f5
git.kernel.org/stable/c/8b68a45f97... WEB
https://git.kernel.org/stable/c/8b68a45f9722f2babe9e7bad00aa74638addf081
git.kernel.org/stable/c/42c574c150... WEB
https://git.kernel.org/stable/c/42c574c1504aa089a0a142e4c13859327570473d
git.kernel.org/stable/c/1444ff890b... WEB
https://git.kernel.org/stable/c/1444ff890b4653add12f734ffeffc173d42862dd
cert-portal.siemens.com/productcert/html/ss... WEB
https://cert-portal.siemens.com/productcert/html/ssa-457936.html
cert-portal.siemens.com/productcert/html/ss... WEB
https://cert-portal.siemens.com/productcert/html/ssa-253495.html
cert-portal.siemens.com/productcert/html/ss... WEB
https://cert-portal.siemens.com/productcert/html/ssa-082556.html
cert-portal.siemens.com/productcert/html/ss... WEB
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=2439687
blog.exodusintel.com/2026/06/08/off-by-e... WEB
https://blog.exodusintel.com/2026/06/08/off-by-exploiting-a-use-after-free-in-the-linux-kernel
Software Security Information SECURITY
https://access.redhat.com/security/cve/CVE-2026-23111
access.redhat.com/errata/rhsa-2026:91... WEB
https://access.redhat.com/errata/RHSA-2026:9112
access.redhat.com/errata/rhsa-2026:65... WEB
https://access.redhat.com/errata/RHSA-2026:6570
access.redhat.com/errata/rhsa-2026:62... WEB
https://access.redhat.com/errata/RHSA-2026:62641
access.redhat.com/errata/rhsa-2026:62... WEB
https://access.redhat.com/errata/RHSA-2026:62639
access.redhat.com/errata/rhsa-2026:18... WEB
https://access.redhat.com/errata/RHSA-2026:18134
access.redhat.com/errata/rhsa-2026:10... WEB
https://access.redhat.com/errata/RHSA-2026:10996
access.redhat.com/errata/rhsa-2026:10... WEB
https://access.redhat.com/errata/RHSA-2026:10108

Frequently Asked Questions

What is CVE-2026-23111?
CVE-2026-23111 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-672: Operation on a Resource after Expiration or Release.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-23111?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-23111?
CVE-2026-23111 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-2026-23111?
CVE-2026-23111 is classified under CWE-672: Operation on a Resource after Expiration or Release (The product uses, accesses, or otherwise operates on a resource after that resource has been expired, released, or revoked.).
How can I check Maven dependencies for CVE-2026-23111?
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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    "url" : "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
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    "type" : "WEB",
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    "type" : "WEB",
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