CVE-2023-53632

Local denial of service via unlocked notifier call

Published Oct 7, 2025 · Updated Oct 7, 2025

Denial of service in Linux kernel 6.3 through 6.4.10 allows local users to destabilize or crash systems during mlx5 profile changes. The mlx5e profile-change path calls xdp_set_features() on a registered network device without holding the RTNL lock, so notifier execution violates required synchronization. Administrative access to change the mlx5 eswitch profile and an affected Mellanox device are required; the demonstrated result is a kernel warning, with system instability or a crash as the bounded consequence.

CVSS severity5.5
Medium
EPSS probability0.18%
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 Linux kernel 6.3 through 6.4.10 allows local users to destabilize or crash systems during mlx5 profile changes. The mlx5e profile-change path calls xdp_set_features() on a registered network device without holding the RTNL lock, so notifier execution violates required synchronization. Administrative access to change the mlx5 eswitch profile and an affected Mellanox device are required; the demonstrated result is a kernel warning, with system instability or a crash as the bounded consequence.

The record

CVE
CVE-2023-53632
Published
Oct 7, 2025
Updated
Oct 7, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Oct 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 7, 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=4d5ab0ad964df178beba031b89429a601893ff61 <16b7775ae4389dd1e885732ea610321c64284e5f
  2. Affected versionversion=4d5ab0ad964df178beba031b89429a601893ff61 <72cc654970658e88a1cdea08f06b11c218efa4da
  3. Affected versionversion=6.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=4d5ab0ad964df178beba031b89429a601893ff61 <16b7775ae4389dd1e885732ea610321c64284e5f; version=4d5ab0ad964df178beba031b89429a601893ff61 <72cc654970658e88a1cdea08f06b11c218efa4da; version=6.3

Published CVSS scores

5.5UbuntuCVSS: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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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