CVE-2026-33968: Samsung Exynos Race Condition Vulnerability

CVE-2026-33968 Overview

CVE-2026-33968 is a Time-of-Check Time-of-Use (TOCTOU) race condition in the camera driver of multiple Samsung Mobile Processor Exynos chipsets. The race condition leads to out-of-bounds access in kernel-mode camera code. A local attacker with low privileges can exploit the flaw to cause limited availability impact on affected devices. The vulnerability is classified under [CWE-125] (Out-of-bounds Read) and requires high attack complexity due to the timing conditions needed to win the race.

Critical Impact
Local low-privileged attackers can trigger out-of-bounds memory access in the Exynos camera driver, potentially degrading device availability on Samsung devices powered by the affected processors.

Affected Products

Samsung Mobile Processor Exynos 1330, 1380, and 1480
Samsung Mobile Processor Exynos 1580, 1680, and 2400
Samsung Mobile Processor Exynos 2500 and 2600

Discovery Timeline

2026-09-14 - CVE-2026-33968 published to the National Vulnerability Database
2026-09-14 - Last updated in the NVD database

Technical Details for CVE-2026-33968

Vulnerability Analysis

The vulnerability resides in the camera driver shipped with multiple Samsung Exynos mobile processors. A TOCTOU race condition allows an attacker to modify a resource between the driver's validation check and its subsequent use. When the race is won, the driver operates on state that no longer matches the validated conditions, producing an out-of-bounds memory access.

Exploitation requires local access and low privileges, which typically translates to code execution within an unprivileged Android application context. The scope is changed, meaning the impact reaches components beyond the vulnerable driver's security context. Successful exploitation impacts availability only, with no direct confidentiality or integrity effect noted in the advisory.

Root Cause

The root cause is non-atomic handling of user-controllable input inside the Exynos camera driver. The driver checks a value or buffer property, then reuses that value in a subsequent operation without ensuring it remains unchanged. A concurrent thread controlled by the attacker mutates the underlying memory between the two points, causing the driver to perform an out-of-bounds read as tracked by [CWE-125].

Attack Vector

An attacker executes code on the target Samsung device and issues concurrent ioctl requests to the camera driver from multiple threads. One thread races to modify shared user-mode memory referenced by the driver, while another thread invokes the vulnerable code path. Winning the race causes the driver to dereference stale pointers or lengths, triggering the out-of-bounds condition. No user interaction is required.

Detailed technical information is available in the Samsung CVE-2026-33968 advisory.

Detection Methods for CVE-2026-33968

Indicators of Compromise

Unexpected crashes or reboots involving the camera subsystem or kernel panics referencing camera driver symbols on Exynos-based devices.
Repeated, high-frequency ioctl calls to camera device nodes such as /dev/video* from a single unprivileged application.
Applications requesting camera access that also spawn multiple worker threads performing rapid memory mapping and unmapping.

Detection Strategies

Monitor Android crash reports and tombstone files for signal SIGSEGV or SIGBUS originating in camera driver stack frames.
Baseline normal camera ioctl volume per application and flag processes exceeding expected thresholds.
Inspect installed applications for camera permission usage paired with unusual native code that manipulates shared memory buffers.

Monitoring Recommendations

Forward mobile device kernel logs and crash reports to a central logging platform for correlation across the fleet.
Track Samsung Exynos firmware and security patch levels through mobile device management (MDM) inventory reports.
Alert on newly installed applications requesting the CAMERA permission from unverified sources.

How to Mitigate CVE-2026-33968

Immediate Actions Required

Apply the Samsung security update for the affected Exynos processor as soon as the OEM device patch becomes available.
Restrict installation of unverified applications on managed Samsung devices through mobile device management policy.
Audit installed applications and remove those requesting camera access without a clear business justification.

Patch Information

Samsung addresses this issue in the semiconductor security update program. Refer to the Samsung Product Security Updates portal and the specific CVE-2026-33968 advisory for firmware and driver patch details. Device OEMs distribute the fix through monthly Android security bulletins.

Workarounds

Deny the CAMERA runtime permission for applications that do not require it.
Enforce MDM policies that block sideloading and restrict app installation to vetted stores.
Prioritize Android security update deployment for devices running the affected Exynos processors.

bash

# Verify Android security patch level on a Samsung device via adb
adb shell getprop ro.build.version.security_patch
adb shell getprop ro.hardware
adb shell getprop ro.board.platform