CVE-2026-124746 Busybox: out-of-bounds read in volume_id_get_buffer() via an offset+length wraparound
A crafted filesystem image can crash BusyBox utilities like blkid, findfs or mount, preventing storage resolution; Linux systems probing untrusted storage should care.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Harmful if only installed
- No
- Needs a specific call
- No
- Fix
- None listed
What is CVE-2026-124746?
CVE-2026-124746 is a medium-severity integer overflow vulnerability in Red Hat Enterprise Linux 6, published on 11 Nov 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
A flaw was found in BusyBox. An integer overflow occurs in the volume_id component when calculating buffer boundaries while probing filesystem metadata. An attacker can exploit this vulnerability by providing a specially crafted filesystem image on an attached storage device. When probed by utilities such as blkid, findfs, or mount, the application crashes, resulting in a Denial of Service (DoS) that prevents the system from resolving or mounting storage devices.
Weakness: CWE-190
Which versions are affected by CVE-2026-124746?
An affected version is exposed as installed. No special setting or call is needed.
How do I fix CVE-2026-124746?
No fix has been published for CVE-2026-124746 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Check arithmetic on sizes and lengths before using the result. More about Integer overflow.
Is CVE-2026-124746 being exploited?
There is no known exploitation of CVE-2026-124746 in the wild and no public exploit code.
Sources
Also known as GHSA-c279-x2f5-7rgj, UBUNTU-CVE-2026-124746.