Description
A flaw was found in BusyBox. The udhcpc6 DHCPv6 client does not properly validate the size of network options sent by a server before copying them into memory. A malicious DHCPv6 server on the local network can exploit this flaw by sending a crafted reply, triggering a stack-based buffer overflow. This vulnerability could allow an attacker to achieve arbitrary code execution with root privileges or cause a denial of service (DoS) crash.
Published: 2026-11-11
Score: 7.6 High
EPSS: n/a
KEV: No
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Remediation

Vendor Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

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History

Wed, 11 Nov 2026 10:45:00 +0000

Type Values Removed Values Added
Description A flaw was found in BusyBox. The udhcpc6 DHCPv6 client does not properly validate the size of network options sent by a server before copying them into memory. A malicious DHCPv6 server on the local network can exploit this flaw by sending a crafted reply, triggering a stack-based buffer overflow. This vulnerability could allow an attacker to achieve arbitrary code execution with root privileges or cause a denial of service (DoS) crash.
Title Busybox: stack buffer overflow in udhcpc6 send_d6_renew() and send_d6_release()
First Time appeared Redhat
Redhat hummingbird
Redhat rhel Els
Weaknesses CWE-787
CPEs cpe:/a:redhat:hummingbird:1
cpe:/o:redhat:rhel_els:6
Vendors & Products Redhat
Redhat hummingbird
Redhat rhel Els
References
Metrics cvssV3_1

{'score': 7.6, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H'}


Subscriptions

Redhat Hummingbird Rhel Els
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-11-11T10:41:14.290Z

Reserved: 2026-11-09T11:36:29.478Z

Link: CVE-2026-124741

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-11-11T11:17:17.233

Modified: 2026-11-11T11:17:17.397

Link: CVE-2026-124741

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses