CVE-2026-124741 Busybox: stack buffer overflow in udhcpc6 send_d6_renew() and send_d6_release()
A malicious local DHCPv6 server can overflow a stack buffer in BusyBox udhcpc6, executing code as root or crashing it.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Harmful if only installed
- No
- Needs a specific call
- No
- Fix
- None listed
What is CVE-2026-124741?
CVE-2026-124741 is a high-severity memory corruption vulnerability in Red Hat Enterprise Linux 6, published on 11 Nov 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-787
Which versions are affected by CVE-2026-124741?
An affected version is exposed as installed. No special setting or call is needed.
How do I fix CVE-2026-124741?
No fix has been published for CVE-2026-124741 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-124741 being exploited?
There is no known exploitation of CVE-2026-124741 in the wild and no public exploit code.
Sources
Also known as GHSA-6p28-q7pv-rxcx, UBUNTU-CVE-2026-124741.