CVE-2026-23463

Local service interruption via dynamic FQID reuse race

Published Apr 3, 2026 · Updated Apr 3, 2026

Race condition in the Linux kernel QMan driver allows local users to interrupt service by racing destruction and reuse of a dynamic FQID. qman_destroy_fq() returns the FQID to gen_pool before clearing fq_table, so qman_create_fq() can reallocate the identifier while the stale entry remains. The flag and concurrent queue operations are required; the public record reports availability loss but does not identify the resulting failure mode.

CVSS severity4.7
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux kernel QMan driver allows local users to interrupt service by racing destruction and reuse of a dynamic FQID. qman_destroy_fq() returns the FQID to gen_pool before clearing fq_table, so qman_create_fq() can reallocate the identifier while the stale entry remains. The flag and concurrent queue operations are required; the public record reports availability loss but does not identify the resulting failure mode.

The record

CVE
CVE-2026-23463
Published
Apr 3, 2026
Updated
Apr 3, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-362, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.9
  2. Affected versionversion=c535e923bb97a4b361e89a6383693482057f8b0c <014077044e874e270ec480515edbc1cadb976cf2
  3. Affected versionversion=c535e923bb97a4b361e89a6383693482057f8b0c <265e56714635c5dd1e5964bfd97fa6e73f62cde5
  4. Affected versionversion=c535e923bb97a4b361e89a6383693482057f8b0c <751f60bd48edaf03f9d84ab09e5ce6705757d50f
  5. Affected versionversion=c535e923bb97a4b361e89a6383693482057f8b0c <85dbbf7dc88b0a54f2e334daedf6f3f31fd004fa
  6. Affected versionversion=c535e923bb97a4b361e89a6383693482057f8b0c <9e3d47904b8153c8c3ad2f9b66d5008aad677aa8
  7. Affected versionversion=c535e923bb97a4b361e89a6383693482057f8b0c <d21923a8059fa896bfef016f55dd769299335cb4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.9; version=c535e923bb97a4b361e89a6383693482057f8b0c <014077044e874e270ec480515edbc1cadb976cf2; version=c535e923bb97a4b361e89a6383693482057f8b0c <265e56714635c5dd1e5964bfd97fa6e73f62cde5; version=c535e923bb97a4b361e89a6383693482057f8b0c <751f60bd48edaf03f9d84ab09e5ce6705757d50f; version=c535e923bb97a4b361e89a6383693482057f8b0c <85dbbf7dc88b0a54f2e334daedf6f3f31fd004fa; version=c535e923bb97a4b361e89a6383693482057f8b0c <9e3d47904b8153c8c3ad2f9b66d5008aad677aa8; version=c535e923bb97a4b361e89a6383693482057f8b0c <d21923a8059fa896bfef016f55dd769299335cb4

Published CVSS scores

4.7NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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