CVE-2023-53369

Local service interruption via DCB policy overflow

Published Sep 18, 2025 · Updated Sep 18, 2025

Out-of-bounds policy access in the Linux kernel DCB subsystem allows local users to interrupt affected systems through crafted netlink data. The dcbnl_bcn_setcfg function parses DCB_ATTR_BCN with dcbnl_pfc_up_nest, then indexes the result as the larger dcbnl_bcn_nest policy, overrunning the policy array. Low-privileged local access is required, and the published impact is limited to loss of availability.

CVSS severity5.5
Medium
EPSS probability0.17%
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 policy access in the Linux kernel DCB subsystem allows local users to interrupt affected systems through crafted netlink data. The dcbnl_bcn_setcfg function parses DCB_ATTR_BCN with dcbnl_pfc_up_nest, then indexes the result as the larger dcbnl_bcn_nest policy, overrunning the policy array. Low-privileged local access is required, and the published impact is limited to loss of availability.

The record

CVE
CVE-2023-53369
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=2.6.29
  2. Affected versionversion=859ee3c43812051e21816c6d6d4cc04fb7ce9b2e <199fde04bd875d28b3a5ca525eaaa004eec6e947
  3. Affected versionversion=859ee3c43812051e21816c6d6d4cc04fb7ce9b2e <31d49ba033095f6e8158c60f69714a500922e0c3
  4. Affected versionversion=859ee3c43812051e21816c6d6d4cc04fb7ce9b2e <5b3dbedb8d4a0f9f7ce904d76b885438af2a21f9
  5. Affected versionversion=859ee3c43812051e21816c6d6d4cc04fb7ce9b2e <8e309f43d0ca4051d20736c06a6f84bbddd881da
  6. Affected versionversion=859ee3c43812051e21816c6d6d4cc04fb7ce9b2e <a0da2684db18dead3bcee12fb185e596e3d63c2b
  7. Affected versionversion=859ee3c43812051e21816c6d6d4cc04fb7ce9b2e <ecff20e193207b44fdbfe64d7de89890f0a7fe6c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.29; version=859ee3c43812051e21816c6d6d4cc04fb7ce9b2e <199fde04bd875d28b3a5ca525eaaa004eec6e947; version=859ee3c43812051e21816c6d6d4cc04fb7ce9b2e <31d49ba033095f6e8158c60f69714a500922e0c3; version=859ee3c43812051e21816c6d6d4cc04fb7ce9b2e <5b3dbedb8d4a0f9f7ce904d76b885438af2a21f9; version=859ee3c43812051e21816c6d6d4cc04fb7ce9b2e <8e309f43d0ca4051d20736c06a6f84bbddd881da; version=859ee3c43812051e21816c6d6d4cc04fb7ce9b2e <a0da2684db18dead3bcee12fb185e596e3d63c2b; version=859ee3c43812051e21816c6d6d4cc04fb7ce9b2e <ecff20e193207b44fdbfe64d7de89890f0a7fe6c

Published CVSS scores

5.5NVDCVSS: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
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

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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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