CVE-2023-53811

Kernel warning via excessive MSI-X vector count

Published Dec 9, 2025 · Updated May 11, 2026

Improper MSI-X vector handling in the Linux kernel irdma driver allows attackers to trigger a kernel warning during initialization. In irdma_cfg_ceq_vector, the driver accepts too many MSI-X vectors and constructs an affinity mask containing a CPU ID beyond the kernel's maximum. Reachability requires irdma initialization with a qualifying RDMA device and excess MSI-X vectors; the published record reports a warning, not a crash or data compromise.

CVSS severityUnavailable
Unscored
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper MSI-X vector handling in the Linux kernel irdma driver allows attackers to trigger a kernel warning during initialization. In irdma_cfg_ceq_vector, the driver accepts too many MSI-X vectors and constructs an affinity mask containing a CPU ID beyond the kernel's maximum. Reachability requires irdma initialization with a qualifying RDMA device and excess MSI-X vectors; the published record reports a warning, not a crash or data compromise.

The record

CVE
CVE-2023-53811
Published
Dec 9, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 9, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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?

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  1. Affected versionversion=44d9e52977a1b90b0db1c7f8b197c218e9226520 <209e4aa9a7b636d8aaa1297e1d089ee2ed91d73f
  2. Affected versionversion=44d9e52977a1b90b0db1c7f8b197c218e9226520 <87674a359ad173a3b8cd484e92e4f1901666da4c
  3. Affected versionversion=44d9e52977a1b90b0db1c7f8b197c218e9226520 <9cd9842c46996ef62173c36619c746f57416bcb0
  4. Affected versionversion=44d9e52977a1b90b0db1c7f8b197c218e9226520 <b3bd44bf20cb3a6a47aa4373e1817147efb4be04
  5. Affected versionversion=5.14

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=44d9e52977a1b90b0db1c7f8b197c218e9226520 <209e4aa9a7b636d8aaa1297e1d089ee2ed91d73f; version=44d9e52977a1b90b0db1c7f8b197c218e9226520 <87674a359ad173a3b8cd484e92e4f1901666da4c; version=44d9e52977a1b90b0db1c7f8b197c218e9226520 <9cd9842c46996ef62173c36619c746f57416bcb0; version=44d9e52977a1b90b0db1c7f8b197c218e9226520 <b3bd44bf20cb3a6a47aa4373e1817147efb4be04; version=5.14

Published CVSS scores

No CVSS assessment is available in this record.

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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