Red Hat Enterprise Linux TFTP buffer overflow

Summaryinfo

A vulnerability described as very critical has been identified in Red Hat Enterprise Linux. This affects an unknown part of the component TFTP Handler. Such manipulation leads to buffer overflow. This vulnerability is traded as CVE-2026-124737. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Red Hat Enterprise Linux (unknown version). It has been rated as very critical. Affected by this issue is an unknown code block of the component TFTP Handler. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A flaw was found in BusyBox. When the TFTP (Trivial File Transfer Protocol) client requests a custom small block size and receives a standard response, it falls back to the default block size without resizing the allocated memory buffer. A malicious TFTP server can exploit this issue by sending standard-sized network packets during a transfer, causing a heap buffer overflow. This flaw allows an attacker to achieve arbitrary code execution or cause a Denial of Service (DoS) by crashing the application.

The advisory is available at access.redhat.com. This vulnerability is handled as CVE-2026-124737 since 11/09/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 11/11/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Operating System

Vendor

• Red Hat

Name

• Enterprise Linux

License

• commercial

Website

• Vendor: https://www.redhat.com/

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