CVE-2023-53340

Local privilege escalation via unchecked DEVX opcode

Published Sep 17, 2025 · Updated Sep 17, 2025

Out-of-bounds write in Linux kernel 5.18 through 6.1.30 and 6.2 through 6.3.4 allows local users to corrupt kernel memory via DEVX. In cmd_status_log, the mlx5 driver uses an unrecognized firmware command opcode to index failure-statistics storage that exists only for known commands. A local user with access to an mlx5 RDMA uverbs device and DEVX can trigger the write, causing kernel memory corruption that enables privilege escalation, a crash, or a hang.

CVSS severity7.8
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Linux kernel 5.18 through 6.1.30 and 6.2 through 6.3.4 allows local users to corrupt kernel memory via DEVX. In cmd_status_log, the mlx5 driver uses an unrecognized firmware command opcode to index failure-statistics storage that exists only for known commands. A local user with access to an mlx5 RDMA uverbs device and DEVX can trigger the write, causing kernel memory corruption that enables privilege escalation, a crash, or a hang.

The record

CVE
CVE-2023-53340
Published
Sep 17, 2025
Updated
Sep 17, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-129, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=34f46ae0d4b38e83cfb26fb6f06b5b5efea47fdc <2a0a935fb64ee8af253b9c6133bb6702fb152ac2
  2. Affected versionversion=34f46ae0d4b38e83cfb26fb6f06b5b5efea47fdc <411e4d6caa7f7169192b8dacc8421ac4fd64a354
  3. Affected versionversion=34f46ae0d4b38e83cfb26fb6f06b5b5efea47fdc <d8b6f175235d7327b4e1b13216859e89496dfbd5
  4. Affected versionversion=5.18

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=34f46ae0d4b38e83cfb26fb6f06b5b5efea47fdc <2a0a935fb64ee8af253b9c6133bb6702fb152ac2; version=34f46ae0d4b38e83cfb26fb6f06b5b5efea47fdc <411e4d6caa7f7169192b8dacc8421ac4fd64a354; version=34f46ae0d4b38e83cfb26fb6f06b5b5efea47fdc <d8b6f175235d7327b4e1b13216859e89496dfbd5; version=5.18

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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

CWE-129Improper Validation of Array Index
T1068Exploitation for Privilege Escalation

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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