CVE-2026-33968 in Exynos
Summary
by MITRE • 09/14/2026
An issue was discovered in camera in Samsung Mobile Processor Exynos 1330, 1380, 1480, 2400, 1580, 2500, 2600, and 1680. In the camera driver, a Time-of-Check Time-of-Use (TOCTOU) race condition leads to out-of-bounds access.
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Analysis
by VulDB Data Team • 09/14/2026
The vulnerability identified in Samsung Mobile Processors within the Exynos series, specifically models including 1330, 1380, 1480, 2400, 1580, 2500, 2600, and 1680, represents a critical flaw in the camera subsystem driver architecture. This issue is classified as a Time-of-Check Time-of-Use race condition, commonly referred to as TOCTOU. In software engineering, particularly within operating system kernels and hardware abstraction layers, a TOCTOU vulnerability arises when there is a discrepancy between the time at which a resource or variable is checked for validity and the time it is actually used by the application or driver logic. This temporal gap allows an attacker who can influence the state of the system during that interval to manipulate the data being processed, leading to unpredictable behavior and potential security breaches. In the context of mobile device processors, such race conditions are particularly dangerous because they occur at a low level where memory safety is paramount for maintaining system integrity.
The technical manifestation of this flaw involves an out-of-bounds access within the camera driver code path. When the driver performs its initial validation checks on input parameters or buffer pointers, it verifies that these values fall within acceptable limits defined by allocated memory regions. However, due to the race condition inherent in the TOCTOU mechanism, the state of these variables can change between the moment they are checked and the moment they are dereferenced for actual data processing. An attacker with local access privileges could exploit this window of opportunity to modify pointers or buffer sizes using concurrent threads or interrupt handlers. Consequently, when the driver proceeds to use the now-invalidated values, it attempts to read from or write to memory addresses that lie outside the boundaries of the intended allocation. This results in an out-of-bounds memory access, which is a severe violation of memory safety principles and can lead to data corruption, application crashes, or arbitrary code execution depending on how the overwritten memory is utilized by subsequent operations.
From a classification perspective, this vulnerability aligns with CWE-367, Time-of-check Time-of-use race condition, as it fundamentally relies on the unsafe handling of shared resources without proper synchronization mechanisms such as locks or atomic operations to ensure consistency between check and use phases. Furthermore, the resulting out-of-bounds access corresponds directly to CWE-125, Out-of-bounds Read, and potentially CWE-787, Out-of-bounds Write, depending on whether the exploit primarily involves reading sensitive kernel memory or overwriting critical control structures. In terms of offensive security frameworks like MITRE ATT&CK for Mobile, this vulnerability facilitates techniques associated with privilege escalation and defense evasion by allowing an attacker to bypass standard memory protection mechanisms inherent in modern mobile operating systems such as Android. The ability to perform out-of-bounds accesses on a system-level component like the camera driver provides a pathway to compromise the confidentiality, integrity, and availability of device data.
The operational impact of this vulnerability is significant for both end-users and enterprise environments relying on Samsung devices powered by these Exynos chips. If successfully exploited, an attacker could potentially extract sensitive information stored in adjacent memory regions, such as encryption keys or user credentials, leading to a breach of confidentiality. Alternatively, the ability to write out-of-bounds allows for the corruption of kernel data structures, which can lead to denial of service through system crashes or more severe outcomes like arbitrary code execution with high privileges. This undermines the trust model of the mobile platform, as users expect their personal media and device functionality to be isolated from malicious actors even if those actors have gained some level of local access. The widespread deployment of these Exynos processors across various mid-range and flagship devices amplifies the potential blast radius of this vulnerability, affecting millions of endpoints globally.
Mitigation strategies for this issue primarily involve patching the camera driver code within the Samsung Mobile Processor firmware to enforce strict synchronization controls around shared variables. Developers must implement proper locking mechanisms or use atomic operations to ensure that checks on buffer boundaries are immediately followed by their usage without any intervening state changes from other threads or interrupts. Additionally, enabling hardware-enforced memory protection features such as ARM Memory Tagging Extension (MTE) can help detect and prevent out-of-bounds accesses at runtime, providing an additional layer of defense against exploitation attempts. For device owners, it is crucial to apply the latest security patches released by Samsung for their specific devices, as these updates typically include fixes for known kernel-level vulnerabilities like this TOCTOU race condition. Regularly updating the operating system ensures that the underlying drivers are hardened against such timing-based attacks and reduces the attack surface available to potential adversaries seeking to compromise device integrity through low-level driver flaws.