CVE-2026-20414 Overview
CVE-2026-20414 is a use-after-free vulnerability in the MediaTek imgsys component affecting Android devices powered by multiple MediaTek chipsets. The flaw allows local privilege escalation when an attacker already holds System-level privileges on the device. No user interaction is required for exploitation. MediaTek addressed the issue under Patch ID ALPS10362999 and Issue ID MSV-5625, published in the February 2026 MediaTek Security Bulletin. The vulnerability is tracked under CWE-416: Use After Free.
Critical Impact
A local attacker with System privileges can exploit the use-after-free condition in imgsys to escalate privileges further, potentially gaining kernel-level access on affected MediaTek-based Android devices.
Affected Products
- Google Android 15.0
- MediaTek chipsets: MT6897, MT6989, MT8196, MT8678
- MediaTek chipsets: MT8766, MT8768, MT8786, MT8796
Discovery Timeline
- 2026-02-02 - CVE-2026-20414 published to NVD
- 2026-02-02 - MediaTek releases Security Bulletin with Patch ID ALPS10362999
- 2026-02-03 - Last updated in NVD database
Technical Details for CVE-2026-20414
Vulnerability Analysis
The vulnerability resides in imgsys, a MediaTek imaging subsystem driver used on multiple System-on-Chip (SoC) platforms. The defect is a use-after-free condition in which memory referenced by the driver is freed but subsequently accessed. An attacker exploiting this dangling reference can corrupt kernel memory structures, hijack control flow, or manipulate privileged data.
Exploitation requires that the attacker already possess System-level privileges on the target Android device. From this position, the attacker can issue crafted requests to the imgsys driver to trigger the freed-memory access. The result is escalation from System context into a higher privilege boundary, typically kernel mode.
Root Cause
The root cause is improper lifetime management of a heap-allocated object within the imgsys driver. The driver retains or reuses a pointer to memory after the underlying allocation has been released. Without proper synchronization or reference counting, subsequent operations dereference the stale pointer, producing the use-after-free condition.
Attack Vector
The attack vector is local. The attacker must execute code on the device with System privileges before targeting imgsys. Once positioned, the attacker invokes the vulnerable driver path to free a tracked object and then trigger a code path that operates on the freed memory. The attack does not require user interaction. Successful exploitation provides high impact on confidentiality, integrity, and availability of the affected kernel component.
No public proof-of-concept code or exploit has been published for CVE-2026-20414. See the MediaTek Security Bulletin February 2026 for vendor technical details.
Detection Methods for CVE-2026-20414
Indicators of Compromise
- Unexpected kernel panics or imgsys driver crashes referencing freed memory addresses in dmesg or device bug reports.
- Processes running with System UID issuing unusual ioctl calls targeting the imgsys device node.
- Presence of unauthorized binaries or modified system services that have already obtained System privilege as a precondition for exploitation.
Detection Strategies
- Monitor Android device logs for repeated faults or stack traces originating in the MediaTek imgsys driver.
- Audit privileged processes for anomalous interactions with vendor-specific kernel drivers using mobile EDR telemetry.
- Correlate System-level privilege acquisition events with subsequent kernel-driver access patterns to identify chained exploitation attempts.
Monitoring Recommendations
- Track patch level reporting from managed Android devices to confirm installation of the February 2026 MediaTek security patch.
- Enroll affected devices in mobile threat defense tooling that surfaces kernel crash forensics and driver-level anomalies.
- Maintain an inventory of MediaTek-based fleet devices mapped to vulnerable chipset SKUs for prioritized patch tracking.
How to Mitigate CVE-2026-20414
Immediate Actions Required
- Apply the February 2026 MediaTek security patch (ALPS10362999) to all affected devices as soon as it is delivered through OEM update channels.
- Identify devices using vulnerable MediaTek chipsets (MT6897, MT6989, MT8196, MT8678, MT8766, MT8768, MT8786, MT8796) and prioritize them for update enforcement.
- Restrict installation of unverified applications and sideloaded packages that could establish the System-level foothold required for exploitation.
Patch Information
MediaTek released the fix under Patch ID ALPS10362999, Issue ID MSV-5625, in the MediaTek Security Bulletin February 2026. Device OEMs integrate this patch into their Android security update for the corresponding bulletin month. Administrators should verify that managed devices report a security patch level reflecting the February 2026 update.
Workarounds
- No vendor-supplied workaround exists. Patching through OEM updates is the only supported remediation.
- Enforce mobile device management (MDM) policies that block devices below the February 2026 patch level from accessing sensitive enterprise resources.
- Reduce attack surface by disabling developer options, USB debugging, and root-enabling tooling on production devices.
# Verify Android security patch level on a managed device
adb shell getprop ro.build.version.security_patch
# Expected output should be 2026-02-01 or later for remediated devices
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
