CVE-2026-33960 in Exynos
Summary
by MITRE • 09/14/2026
An issue was discovered in Samsung Mobile Processor and Wearable Processor Exynos 1330, 1380, 1480, 1580, 1680, W920, W930, and W1000. . A malformed ioctl command to the Wi-Fi interface device can lead to improper buffer size allocation, resulting in an out-of-bounds write and causing a denial of service (DoS).
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Analysis
by VulDB Data Team • 09/14/2026
The vulnerability identified within Samsung Mobile Processor and Wearable Processor families, specifically encompassing Exynos 1330, 1380, 1480, 1580, 1680 as well as the W920, W930, and W1000 wearable series, represents a critical flaw in the kernel-level handling of Wi-Fi interface commands. This issue stems from an improper validation mechanism when processing ioctl system calls directed at the wireless network device driver. In modern operating systems such as Android or Tizen, which power these devices, the interaction between user-space applications and kernel-space drivers is mediated through ioctl interfaces. When a malformed command is submitted to this interface, the underlying code fails to adequately verify the parameters provided by the caller before proceeding with memory operations. This lack of rigorous input validation allows an attacker who can execute arbitrary code or exploit another vulnerability within the application layer to craft specific malicious requests that bypass standard safety checks.
The core technical flaw lies in the buffer size allocation logic associated with these ioctl commands. Upon receiving a request, the driver is expected to allocate memory buffers sufficient for processing the command and its payload. However, due to the malformed nature of the input, the system miscalculates or ignores the required buffer dimensions. This leads directly to an out-of-bounds write condition where data is written beyond the boundaries of the allocated heap or stack memory segment. In C-based kernel drivers, such as those typically found in embedded SoCs like the Exynos series, this type of memory corruption is particularly dangerous because it can overwrite adjacent metadata structures, function pointers, or other critical variables residing in contiguous memory locations. While the immediate manifestation described is a denial of service, out-of-bounds writes are frequently precursors to more severe security breaches, including arbitrary code execution if the attacker can precisely control the overwritten data and target specific return addresses or object vtables.
The operational impact of this vulnerability is primarily characterized by system instability and loss of availability for Wi-Fi connectivity services on affected devices. When an out-of-bounds write corrupts critical kernel memory structures, it typically triggers a panic condition in the operating system, resulting in an immediate reboot of the device. For mobile users, this means sudden disconnection from networks, interruption of ongoing communications, and potential data loss if unsaved work is present on the device. In wearable contexts such as smartwatches running W-series processors, where battery life and continuous connectivity are paramount, a forced reboot can disrupt health tracking features, notifications, and pairing with smartphones. Furthermore, because this vulnerability resides in the kernel space, it does not require elevated privileges to exploit if an attacker has already achieved code execution within any application that holds access to network device interfaces, which is common for many system services on Android devices.
From a classification perspective, this flaw aligns closely with CWE-787: Out-of-bounds Write and CWE-20: Improper Input Validation. The failure to validate the size parameter of an ioctl command before memory allocation is a classic example of input validation weakness that leads to buffer overflow conditions. In terms of attack vectors, this vulnerability falls under ATT&CK technique T1059: Command and Scripting Interpreter if exploited via scriptable interfaces or more likely T1203: Exploitation for Defense Evasion if used in conjunction with other exploits to maintain persistence after a crash, though the primary impact here is denial of service. The vulnerability highlights the risks associated with complex driver codebases where edge cases in command parsing may not be exhaustively tested during development cycles.
Mitigation strategies must focus on both immediate patching and long-term architectural improvements. Samsung should release firmware updates that enforce strict bounds checking before any buffer allocation occurs within the Wi-Fi driver ioctl handlers. Developers must ensure that all input parameters, particularly those related to size and length, are validated against maximum allowable limits defined by the hardware specifications or kernel constraints. Additionally, implementing Address Space Layout Randomization (ASLR) and Stack Canaries can help mitigate the potential for exploitation leading to code execution, although these protections do not prevent the denial of service impact itself. For device manufacturers and users, ensuring that devices are updated with the latest security patches is critical to closing this gap in kernel-level input validation. Security researchers should also consider submitting reports through coordinated disclosure channels to allow vendors adequate time to develop and test fixes before public exposure, thereby reducing the window of opportunity for malicious actors to weaponize the flaw against widespread device populations.