CVE-2026-56117

Local memory corruption via stale control-socket pointer

Published Jun 23, 2026 · Updated Jun 23, 2026

Heap use-after-free in dhcpcd 10.3.2 and earlier allows local users to corrupt memory through the control socket. control_recvdata() frees the client object after a privileged command error, but a combined READ and HANGUP event then passes the stale pointer to control_hangup(). Reachability requires disabled or failed privilege separation with a mode 0666 control socket; triggering corrupts daemon memory and can interrupt network configuration.

CVSS severity5.7
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

Heap use-after-free in dhcpcd 10.3.2 and earlier allows local users to corrupt memory through the control socket. control_recvdata() frees the client object after a privileged command error, but a combined READ and HANGUP event then passes the stale pointer to control_hangup(). Reachability requires disabled or failed privilege separation with a mode 0666 control socket; triggering corrupts daemon memory and can interrupt network configuration.

The record

CVE
CVE-2026-56117
Published
Jun 23, 2026
Updated
Jun 23, 2026
Vendor
Network Configuration
Product
dhcpcd
Classifications
CWE-416, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 23, 2026Record 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=0 <=10.3.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Network Configuration · dhcpcdversion=0 <=10.3.2

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.7VulnCheckCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
4.7VulnCheckCVSS:3.1/AV:L/AC:H/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

CWE-416Use After Free
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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