CVE-2026-23394: Software Security Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-p5pc-67g7-qcv2
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CVSS 4.7
CWE-362
Published
Advisory Summary

CVE-2026-23394 is a MODERATE (CVSS 4.7) security vulnerability vulnerability (CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-23394 at a Glance

CVE Identifier CVE-2026-23394
GHSA Identifier GHSA-p5pc-67g7-qcv2
Severity MODERATE
CVSS v3.1 Base Score 4.7
CWE Classification CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 4.7

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

Attack Vector Local (AV:L)
Attack Complexity High (AC:H)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2026-23394

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-2026-23394, 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-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition'), where the product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently. 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: af_unix: Give up GC if MSG_PEEK intervened. Igor Ushakov reported that GC purged the receive queue of an alive socket due to a race with MSG_PEEK with a nice repro. This is the exact same issue previously fixed by commit cbcf01128d0a ("af_unix: fix garbage collect vs MSG_PEEK"). After GC was replaced with the current algorithm, the cited commit removed the locking dance in unix_peek_fds() and reintroduced the same issue. The problem is that MSG_PEEK bumps a file refcount without interacting with GC. Consider an SCC containing sk-A and sk-B, where sk-A is close()d but can be recv()ed via sk-B. The bad thing happens if sk-A is recv()ed with MSG_PEEK from sk-B and sk-B is close()d while GC is checking unix_vertex_dead() for sk-A and sk-B. GC thread User thread --------- ----------- unix_vertex_dead(sk-A) -> true <------. \ `------ recv(sk-B, MSG_PEEK) invalidate !! -> sk-A's file refcount : 1 -> 2 close(sk-B) -> sk-B's file refcount : 2 -> 1 unix_vertex_dead(sk-B) -> true Initially, sk-A's file refcount is 1 by the inflight fd in sk-B recvq. GC thinks sk-A is dead because the file refcount is the same as the number of its inflight fds. However, sk-A's file refcount is bumped silently by MSG_PEEK, which invalidates the previous evaluation. At this moment, sk-B's file refcount is 2; one by the open fd, and one by the inflight fd in sk-A. The subsequent close() releases one refcount by the former. Finally, GC incorrectly concludes that both sk-A and sk-B are dead. One option is to restore the locking dance in unix_peek_fds(), but we can resolve this more elegantly thanks to the new algorithm. The point is that the issue does not occur without the subsequent close() and we actually do not need to synchronise MSG_PEEK with the dead SCC detection. When the issue occurs, close() and GC touch the same file refcount. If GC sees the refcount being decremented by close(), it can just give up garbage-collecting the SCC. Therefore, we only need to signal the race during MSG_PEEK with a proper memory barrier to make it visible to the GC. Let's use seqcount_t to notify GC when MSG_PEEK occurs and let it defer the SCC to the next run. This way no locking is needed on the MSG_PEEK side, and we can avoid imposing a penalty on every MSG_PEEK unnecessarily. Note that we can retry within unix_scc_dead() if MSG_PEEK is detected, but we do not do so to avoid hung task splat from abusive MSG_PEEK calls.

References

NVD — CVE-2026-23394 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-23394
git.kernel.org/stable/c/3106f326f6... WEB
https://git.kernel.org/stable/c/3106f326f67c03dd9da4ca64663d11e40138cf40
git.kernel.org/stable/c/37dd7ab332... WEB
https://git.kernel.org/stable/c/37dd7ab332396eb8dd80b2dc7ea4b61abf767436
git.kernel.org/stable/c/72cf49ad50... WEB
https://git.kernel.org/stable/c/72cf49ad50c16270b52bc512d9c2df5743922968
git.kernel.org/stable/c/980999a96e... WEB
https://git.kernel.org/stable/c/980999a96e1ad043f1197606e5d637219cb102b9
git.kernel.org/stable/c/e3dd56fb56... WEB
https://git.kernel.org/stable/c/e3dd56fb5683ba80bf8d7a2f9aa21cfa53f05202
git.kernel.org/stable/c/e5b31d988a... WEB
https://git.kernel.org/stable/c/e5b31d988a41549037b8d8721a3c3cae893d8670

Frequently Asked Questions

What is CVE-2026-23394?
CVE-2026-23394 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition').
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-23394?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What is the CVSS score of CVE-2026-23394?
CVE-2026-23394 has a CVSS v3.1 base score of 4.7 (MODERATE) with vector string CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-23394?
CVE-2026-23394 is classified under CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') (The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.).
How can I check Maven dependencies for CVE-2026-23394?
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-p5pc-67g7-qcv2",
  "modified" : "2026-08-19T18:31:58Z",
  "published" : "2026-03-25T12:30:24Z",
  "aliases" : [ "CVE-2026-23394" ],
  "details" : "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Give up GC if MSG_PEEK intervened.\n\nIgor Ushakov reported that GC purged the receive queue of\nan alive socket due to a race with MSG_PEEK with a nice repro.\n\nThis is the exact same issue previously fixed by commit\ncbcf01128d0a (\"af_unix: fix garbage collect vs MSG_PEEK\").\n\nAfter GC was replaced with the current algorithm, the cited\ncommit removed the locking dance in unix_peek_fds() and\nreintroduced the same issue.\n\nThe problem is that MSG_PEEK bumps a file refcount without\ninteracting with GC.\n\nConsider an SCC containing sk-A and sk-B, where sk-A is\nclose()d but can be recv()ed via sk-B.\n\nThe bad thing happens if sk-A is recv()ed with MSG_PEEK from\nsk-B and sk-B is close()d while GC is checking unix_vertex_dead()\nfor sk-A and sk-B.\n\n  GC thread                    User thread\n  ---------                    -----------\n  unix_vertex_dead(sk-A)\n  -> true   <------.\n                    \\\n                     `------   recv(sk-B, MSG_PEEK)\n              invalidate !!    -> sk-A's file refcount : 1 -> 2\n\n                               close(sk-B)\n                               -> sk-B's file refcount : 2 -> 1\n  unix_vertex_dead(sk-B)\n  -> true\n\nInitially, sk-A's file refcount is 1 by the inflight fd in sk-B\nrecvq.  GC thinks sk-A is dead because the file refcount is the\nsame as the number of its inflight fds.\n\nHowever, sk-A's file refcount is bumped silently by MSG_PEEK,\nwhich invalidates the previous evaluation.\n\nAt this moment, sk-B's file refcount is 2; one by the open fd,\nand one by the inflight fd in sk-A.  The subsequent close()\nreleases one refcount by the former.\n\nFinally, GC incorrectly concludes that both sk-A and sk-B are dead.\n\nOne option is to restore the locking dance in unix_peek_fds(),\nbut we can resolve this more elegantly thanks to the new algorithm.\n\nThe point is that the issue does not occur without the subsequent\nclose() and we actually do not need to synchronise MSG_PEEK with\nthe dead SCC detection.\n\nWhen the issue occurs, close() and GC touch the same file refcount.\nIf GC sees the refcount being decremented by close(), it can just\ngive up garbage-collecting the SCC.\n\nTherefore, we only need to signal the race during MSG_PEEK with\na proper memory barrier to make it visible to the GC.\n\nLet's use seqcount_t to notify GC when MSG_PEEK occurs and let\nit defer the SCC to the next run.\n\nThis way no locking is needed on the MSG_PEEK side, and we can\navoid imposing a penalty on every MSG_PEEK unnecessarily.\n\nNote that we can retry within unix_scc_dead() if MSG_PEEK is\ndetected, but we do not do so to avoid hung task splat from\nabusive MSG_PEEK calls.",
  "severity" : [ {
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    "score" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H"
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  "affected" : [ ],
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    "type" : "WEB",
    "url" : "https://git.kernel.org/stable/c/37dd7ab332396eb8dd80b2dc7ea4b61abf767436"
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    "url" : "https://git.kernel.org/stable/c/72cf49ad50c16270b52bc512d9c2df5743922968"
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  } ],
  "database_specific" : {
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    "severity" : "MODERATE",
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    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-03-25T11:16:40Z"
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}