CVE-2025-48769 Apache NuttX RTOS: fs/vfs/fs_rename: use after free
A use-after-free in NuttX RTOS allows attackers with write access to corrupt memory and potentially execute code or modify data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-48769?
CVE-2025-48769 is a medium-severity use after free vulnerability in Apache NuttX RTOS, published on 1 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Use After Free vulnerability was discovered in fs/vfs/fs_rename code of the Apache NuttX RTOS, that due recursive implementation and single buffer use by two different pointer variables allowed arbitrary user provided size buffer reallocation and write to the previously freed heap chunk, that in specific cases could cause unintended virtual filesystem rename/move operation results.
This issue affects Apache NuttX RTOS: from 7.20 before 12.11.0.
Users of virtual filesystem based services with write access especially when exposed over the network (i.e. FTP) are affected and recommended to upgrade to version 12.11.0 that fixes the issue.
Weakness: CWE-416
Which versions are affected by CVE-2025-48769?
It affects 1 product.
Products include Apache Nuttx.
How do I fix CVE-2025-48769?
No fix has been published for CVE-2025-48769 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2025-48769 being exploited?
There is no known exploitation of CVE-2025-48769 in the wild and no public exploit code.
Other vulnerabilities in Apache NuttX RTOS
- CVE-2025-47868 Apache NuttX RTOS: tools/bdf-converter.: tools/bdf-converter: Fix loop termination condition.
- CVE-2025-47869 Apache NuttX RTOS: examples/xmlrpc: Fix calls buffers size.
- CVE-2025-35003 Apache NuttX RTOS: NuttX Bluetooth Stack HCI and UART DoS/RCE Vulnerabilities.
- CVE-2021-26461 malloc, realloc and memalign implementations are vulnerable to integer wrap-arounds
- CVE-2020-17529 Apache NuttX (incubating) Out of Bound Write from invalid fragmentation offset value specified in the IP header
Sources
Also known as GHSA-mrp2-wx3j-867f.