The Apache Software Foundation has released important security updates for Apache NuttX RTOS, a widely used real-time operating system designed for embedded and IoT devices. These updates address two filesystem-related vulnerabilities that could allow attackers to crash devices, corrupt memory, or disrupt system operations, especially when file services are exposed over a network.
Apache NuttX is commonly deployed across a broad range of hardware, from 8-bit microcontrollers to 64-bit systems, making these flaws particularly concerning for industries relying on embedded systems, including industrial control, automotive, medical devices, and IoT environments.
The vulnerabilities affect the virtual filesystem (VFS) component of NuttX and have been assigned the identifiers CVE-2025-48769 and CVE-2025-48768. While neither issue is rated as critical, both pose real risks in production environments if left unpatched.
The more serious of the two flaws is CVE-2025-48769, which has been rated Moderate severity. This vulnerability is classified as a Use After Free memory bug and exists in the fs/vfs/fs_rename code responsible for handling file rename operations.
According to the Apache advisory, the issue originates from a recursive implementation combined with improper buffer handling. Specifically, the same memory buffer is referenced by two different pointer variables, leading to unsafe memory reuse.
In certain conditions, an attacker can:
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Trigger a buffer reallocation with an arbitrary size
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Force the system to write data into a memory region that has already been freed
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Corrupt heap memory during a filesystem rename or move operation
This type of memory corruption can lead to unexpected behavior in the virtual filesystem, including incorrect rename results or system instability. While exploitation may require specific conditions, the risk increases significantly when filesystem services are exposed remotely.
Use After Free vulnerabilities are dangerous because they can:
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Crash embedded devices
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Corrupt critical memory structures
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Potentially open the door to further exploitation
In resource-constrained environments like RTOS-based systems, such memory issues can quickly lead to device failure or unresponsive systems.
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Apache NuttX RTOS 7.20
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All versions prior to 12.11.0
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Upgrade to Apache NuttX RTOS version 12.11.0 or later
The second vulnerability, CVE-2025-48768, is rated Low severity but can still cause serious operational issues. This flaw is a logic error found in the fs/inode/fs_inoderemove code path.
The bug allows the removal of the root filesystem inode, an action that should normally be blocked by the operating system. If triggered, this incorrect behavior can result in:
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A NULL pointer dereference
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A failed debug assertion
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A complete system crash or freeze
In most cases, exploitation leads to a Denial of Service (DoS) condition, where the affected device becomes unresponsive and requires a reboot or manual recovery.
The exact impact depends on the target architecture and system configuration, but typical outcomes include:
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System hang
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Kernel panic
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Forced reboot
For embedded systems operating in real-time environments, even a short outage can disrupt critical services or industrial processes.
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Apache NuttX RTOS 10.0.0
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All versions prior to 12.10.0
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Upgrade to Apache NuttX RTOS version 12.10.0 or later
Although both vulnerabilities exist deep within the NuttX kernel, the Apache advisory clearly warns that they can be reached remotely under certain conditions.
Devices are particularly exposed if they:
Use virtual filesystem-based services
Allow write access
Expose services over a network
Examples include devices running FTP or similar file transfer services. In such scenarios, a remote attacker could potentially trigger the vulnerable code paths without physical access to the device.
This risk is especially relevant for IoT and industrial devices deployed in exposed or semi-trusted networks.
Apache strongly recommends that all users of NuttX RTOS update immediately to patched versions. Delaying these updates could leave devices vulnerable to crashes or memory corruption attacks.
CVE-2025-48769 (Use After Free)
→ Upgrade to Apache NuttX RTOS 12.11.0CVE-2025-48768 (Root Inode Removal DoS)
→ Upgrade to Apache NuttX RTOS 12.10.0
In addition to upgrading, organizations should also:
Limit or disable unnecessary filesystem services
Avoid exposing file services directly to untrusted networks
Apply network-level access controls where possible
These newly patched vulnerabilities highlight the growing importance of securing embedded and RTOS-based systems. As Apache NuttX continues to be adopted across critical environments, even moderate or low-severity bugs can have significant real-world impact if exploited.
By applying the latest updates and reviewing device exposure, developers and security teams can reduce the risk of system crashes, memory corruption, and service disruptions.
Keeping RTOS platforms secure is no longer optional—it is a key part of modern cybersecurity strategy.
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