Exynos DRM HDR Driver TOCTOU Race Causing Heap Overflow Crash
CVE-2026-23786 Published on September 14, 2026
An issue was discovered in DPU in Samsung Mobile Processor Exynos 1280, 2200, 1380, 1480, 2400, 1580, 2500, 1680, and 2600. A TOCTOU race condition in the Exynos DRM HDR Driver leads to a heap overflow, causing a kernel crash.
Vulnerability Analysis
CVE-2026-23786 is exploitable with local system access, and requires small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a small impact on availability.
Weakness Type
What is a TOCTTOU Vulnerability?
The software checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the software to perform invalid actions when the resource is in an unexpected state. This weakness can be security-relevant when an attacker can influence the state of the resource between check and use. This can happen with shared resources such as files, memory, or even variables in multithreaded programs.
CVE-2026-23786 has been classified to as a TOCTTOU vulnerability or weakness.
Products Associated with CVE-2026-23786
Want to know whenever a new CVE is published for Samsung Exynos 1280 Firmware? stack.watch will email you.
Affected Versions
Samsung Exynos 1280 firmware:- Before and including 2025-12-24 is affected.