CVE-2025-47868: Apache NuttX RTOS: tools/bdf-converter.: tools/bdf-converter: Fix loop termination condition.

[Tomasz Cedro <cederom () apache org>]

Severity: low 

Affected versions:

- Apache NuttX RTOS: tools/bdf-converter. 6.9 before 12.9.0

Description:

Out-of-bounds Write resulting in possible Heap-based Buffer Overflow vulnerability was discovered in 
tools/bdf-converter font conversion utility that is part of Apache NuttX RTOS repository. This standalone program is 
optional and neither part of NuttX RTOS nor Applications runtime, but active bdf-converter users may be affected when 
this tool is exposed to external provided user data data (i.e. publicly available automation).

This issue affects Apache NuttX: from 6.9 before 12.9.0.

Users are recommended to upgrade to version 12.9.0, which fixes the issue.

Credit:

Chánh Phạm <chanhphamviet () gmail com> (finder)
Nathan Hartman <hartman.nathan () gmail com> (remediation developer)
Tomek CEDRO <tomek () cedro info> (coordinator)
Alan Carvalho de Assis <acassis () gmail com> (remediation reviewer)
Alin Jerpelea <jerpelea () gmail com> (remediation reviewer)
Lee, Lup Yuen <luppy () appkaki com> (remediation reviewer)
Arnout Engelen <engelen () apache org> (coordinator)

References:

https://github.com/apache/nuttx/pull/16000
https://nuttx.apache.org
https://www.cve.org/CVERecord?id=CVE-2025-47868