CVE-2023-6679

System crash via omitted DPLL pin state

Published Dec 11, 2023 · Updated Nov 21, 2025

Null pointer dereference in the DPLL subsystem of Red Hat Enterprise Linux 9 allows local users to crash the system via a crafted request. dpll_pin_parent_pin_set() passes DPLL_A_PIN_STATE to nla_get_u32() without first checking whether the optional attribute is present. Reachability requires local low-privilege access and a DPLL pin exposed through netlink; the resulting kernel fault interrupts the host.

CVSS severity5.5
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in the DPLL subsystem of Red Hat Enterprise Linux 9 allows local users to crash the system via a crafted request. dpll_pin_parent_pin_set() passes DPLL_A_PIN_STATE to nla_get_u32() without first checking whether the optional attribute is present. Reachability requires local low-privilege access and a DPLL pin exposed through netlink; the resulting kernel fault interrupts the host.

The record

CVE
CVE-2023-6679
Published
Dec 11, 2023
Updated
Nov 21, 2025
Vendor
Red Hat
Product
Red Hat Enterprise Linux 9.2 Extended Update Support
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 11, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 21, 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?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Red Hat · Red Hat Enterprise Linux 9.2 Extended Update SupportAffected versions are unavailable in this record.
Red Hat · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.

Published CVSS scores

5.5Red Hat, Inc.CVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-476NULL Pointer Dereference
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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