CVE-2023-53393

Local host crash via zero device port number

Published Sep 18, 2025 · Updated Sep 18, 2025

Denial of service in the RDMA/mlx5 driver in Linux allows local users to crash the host through device statistics setup. When port_num is zero, mlx5_ib_get_hw_stats passes it unchanged to helpers that assume port numbers start at one, causing invalid kernel memory access and an oops. Reaching the fault requires local low-privileged access and the mlx5 RDMA device path; the bounded consequence is a host crash.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the RDMA/mlx5 driver in Linux allows local users to crash the host through device statistics setup. When port_num is zero, mlx5_ib_get_hw_stats passes it unchanged to helpers that assume port numbers start at one, causing invalid kernel memory access and an oops. Reaching the fault requires local low-privileged access and the mlx5 RDMA device path; the bounded consequence is a host crash.

The record

CVE
CVE-2023-53393
Published
Sep 18, 2025
Updated
Sep 18, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2025Record 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=4.16
  2. Affected versionversion=aac4492ef23a176b6f1a41aadb99177eceb1fc06 <38b50aa44495d5eb4218f0b82fc2da76505cec53
  3. Affected versionversion=aac4492ef23a176b6f1a41aadb99177eceb1fc06 <8d89870d63758363b07ace5c2df82d6bf865f78b
  4. Affected versionversion=aac4492ef23a176b6f1a41aadb99177eceb1fc06 <9a97da4674b890b4c28f5f12beba8c33a9cd2f49
  5. Affected versionversion=aac4492ef23a176b6f1a41aadb99177eceb1fc06 <e597b003c736217b0c99ccf1b240c25009105238

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.16; version=aac4492ef23a176b6f1a41aadb99177eceb1fc06 <38b50aa44495d5eb4218f0b82fc2da76505cec53; version=aac4492ef23a176b6f1a41aadb99177eceb1fc06 <8d89870d63758363b07ace5c2df82d6bf865f78b; version=aac4492ef23a176b6f1a41aadb99177eceb1fc06 <9a97da4674b890b4c28f5f12beba8c33a9cd2f49; version=aac4492ef23a176b6f1a41aadb99177eceb1fc06 <e597b003c736217b0c99ccf1b240c25009105238

Published CVSS scores

5.5NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CISA-ADPCVSS:3.1/AV:L/AC:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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