CVE-2026-20486 Overview
CVE-2026-20486 is a medium-severity vulnerability in the MediaTek imgsensor driver. Incorrect error handling in the component can trigger an application crash. An attacker who already holds System-level privilege can leverage the flaw for local escalation of privilege. Exploitation requires no user interaction. MediaTek tracks the fix under Patch ID ALPS11012302 and Issue ID MSV-7833. The weakness is classified as [CWE-754] (Improper Check for Unusual or Exceptional Conditions).
Critical Impact
An attacker with existing System privilege can escalate further by exploiting improper error handling in the imgsensor driver, gaining higher privileges without user interaction.
Affected Products
- MediaTek chipsets shipping the imgsensor driver component
- Android devices running MediaTek platform software prior to Patch ID ALPS11012302
- Refer to the MediaTek Product Security Bulletin for the complete list of affected chipset models
Discovery Timeline
- 2026-08-03 - CVE-2026-20486 published to NVD
- 2026-08-05 - Last updated in NVD database
Technical Details for CVE-2026-20486
Vulnerability Analysis
The vulnerability resides in the MediaTek imgsensor kernel driver, which manages image sensor operations on Android devices. Incorrect handling of error conditions inside the driver produces an unstable state that can crash the calling application. When the exceptional path is not checked, the driver leaves resources or execution state inconsistent. An attacker who already controls a System-privileged process can drive the driver into this faulty path to escalate privileges beyond System context. The CWE-754 mapping reflects the absence of proper checks for unusual or exceptional conditions in the driver code.
Root Cause
The root cause is improper validation of error return values within the imgsensor component. When a subroutine returns an error, subsequent code continues execution as if the operation succeeded. This mishandling corrupts driver state, allowing a caller with System privilege to reach a code path that grants elevated capabilities.
Attack Vector
Exploitation is local. An attacker must already run code with System privilege on the target device, so this vulnerability is typically chained after an initial compromise. No user interaction is required. The attacker invokes the vulnerable imgsensor interface, forces the exceptional condition, and rides the incorrect error path to gain privileges beyond System.
No verified proof-of-concept code is publicly available. See the MediaTek Product Security Bulletin for vendor-provided technical detail.
Detection Methods for CVE-2026-20486
Indicators of Compromise
- Unexpected crashes or tombstone files referencing the imgsensor driver in /data/tombstones/.
- Kernel log entries (dmesg, logcat -b kernel) showing repeated imgsensor error returns followed by process termination.
- Presence of unauthorized processes gaining privileges beyond System context on MediaTek-based devices.
Detection Strategies
- Monitor Android device telemetry for anomalous access patterns to imgsensor ioctl interfaces from non-camera processes.
- Correlate System-privileged process activity with subsequent privilege transitions using EDR telemetry from mobile management tooling.
- Track deployment status of MediaTek's August 2026 security patch level across managed device fleets.
Monitoring Recommendations
- Ingest Android kernel and system logs into a centralized SIEM to alert on imgsensor fault signatures.
- Enforce mobile device management (MDM) baselines that report the security patch level of each device.
- Alert when devices remain below the August 2026 MediaTek patch level after a defined remediation window.
How to Mitigate CVE-2026-20486
Immediate Actions Required
- Apply the vendor patch identified as ALPS11012302 through the device manufacturer's OTA update channel.
- Inventory MediaTek-based devices and verify current security patch level against the August 2026 bulletin.
- Restrict installation of untrusted applications on affected devices until patches are deployed.
Patch Information
MediaTek released the fix under Patch ID ALPS11012302 (Issue ID MSV-7833) as part of the August 2026 Product Security Bulletin. Device OEMs integrate the patch into their monthly Android security updates. Consult the MediaTek Product Security Bulletin and the OEM's security bulletin for release timing on specific device models.
Workarounds
- No vendor-supplied workaround exists; patching is the supported remediation path.
- Reduce attack surface by limiting which applications and services run with System privilege on affected devices.
- Enroll devices in an MDM platform to accelerate patch delivery and enforce compliance policies.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
