CVE-2026-82927 Overview
CVE-2026-82927 is an untrusted pointer dereference vulnerability in Samsung Open Source mTower, a trusted execution environment (TEE) implementation for microcontrollers. The flaw allows local attackers to manipulate pointer values processed by the affected code paths, leading to availability impact on the host system. The vulnerability is classified under [CWE-822: Untrusted Pointer Dereference]. The issue affects mTower versions prior to commit 06994e303637512e39062f3e037c222e8448e57e.
Critical Impact
Successful exploitation requires local access and user interaction, and can result in a high availability impact on the affected system through pointer manipulation.
Affected Products
- Samsung Open Source mTower (all versions before commit 06994e303637512e39062f3e037c222e8448e57e)
Discovery Timeline
- 2026-09-01 - CVE-2026-82927 published to NVD
- 2026-09-01 - Last updated in NVD database
Technical Details for CVE-2026-82927
Vulnerability Analysis
mTower is a trusted execution environment designed for constrained devices, offering security services to normal-world applications. The vulnerability arises when the code dereferences a pointer whose value originates from an untrusted source without validating that it points to a safe, expected memory region. An attacker able to influence the pointer value can direct dereferences to arbitrary memory addresses.
Because the CVSS vector indicates no confidentiality or integrity impact but high availability impact, exploitation results in process or system disruption rather than data disclosure or code execution. The requirement for user interaction suggests the pointer must be introduced through an operation invoked by a legitimate user, such as loading a crafted trusted application or providing malformed input to a client API.
Root Cause
The root cause is missing validation of pointer values before dereference. The affected code path accepts a pointer supplied by an untrusted context and uses it without confirming that it references valid, allocated memory owned by the correct security domain. This pattern is characteristic of [CWE-822] weaknesses in TEE and low-level firmware code.
Attack Vector
The attack vector is local, meaning the attacker must have prior access to the device running mTower. Exploitation additionally requires user interaction. A crafted request or trusted application input causes the vulnerable component to dereference an attacker-influenced pointer, triggering an invalid memory access and disrupting the trusted execution environment.
No public proof-of-concept exploit is available. The upstream fix is tracked in the Samsung mTower Pull Request #250.
Detection Methods for CVE-2026-82927
Indicators of Compromise
- Unexpected crashes, resets, or fault exceptions in the mTower trusted execution environment or its host process.
- Presence of mTower builds compiled from commits earlier than 06994e303637512e39062f3e037c222e8448e57e.
- Anomalous inputs or trusted application invocations that repeatedly trigger TEE faults on a target device.
Detection Strategies
- Inventory embedded devices and firmware images to identify builds of Samsung mTower that predate the fix commit.
- Review CI and build systems for pinned mTower revisions and flag any prior to 06994e303637512e39062f3e037c222e8448e57e.
- Audit code paths that pass pointers between the normal world and the secure world for missing bounds and ownership checks.
Monitoring Recommendations
- Monitor device logs and crash telemetry for repeated secure-world faults that correlate with specific client requests.
- Track integration of upstream mTower commits in vendor firmware pipelines and alert on outdated dependencies.
- Collect and centralize firmware version data so analysts can query affected fleets when new mTower advisories are published.
How to Mitigate CVE-2026-82927
Immediate Actions Required
- Update mTower to a build that includes commit 06994e303637512e39062f3e037c222e8448e57e or later and rebuild affected firmware images.
- Restrict local access to devices running vulnerable mTower builds, especially in shared or multi-tenant deployments.
- Review any custom trusted applications for additional untrusted pointer dereference patterns and apply the same validation model as the upstream fix.
Patch Information
The fix is available upstream in the Samsung mTower repository. Refer to the Samsung mTower Pull Request #250 for the code changes that resolve the untrusted pointer dereference. Vendors shipping products based on mTower should rebase onto or cherry-pick commit 06994e303637512e39062f3e037c222e8448e57e and re-release affected firmware.
Workarounds
- Limit exposure of the vulnerable TEE interfaces to trusted local users until firmware can be updated.
- Disable or gate features that invoke the affected trusted application entry points if they are not required for production workloads.
- Apply strict input validation in normal-world clients so that pointer-bearing parameters passed to mTower are constrained to expected ranges.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
