CVE-2026-41973: Privilege Escalation Vulnerability

CVE-2026-41973 Overview

CVE-2026-41973 is a permission control vulnerability affecting the calls functionality, disclosed through the Huawei Security Bulletin for June 2026. The flaw is categorized under [CWE-840] (Business Logic Errors) and stems from improper enforcement of permission checks during call-related operations.

Successful exploitation may affect availability of the impacted device. The attack vector is local, meaning an adversary requires local access to the device to trigger the condition. No authentication or user interaction is required to exploit the flaw.

Critical Impact
A local attacker can abuse weak permission enforcement in the calls component to degrade availability on the affected device.

Affected Products

Huawei consumer devices referenced in the June 2026 security bulletin
Specific affected versions and models are enumerated in the vendor advisory
No Common Platform Enumeration (CPE) entries were published in the NVD record at disclosure

Discovery Timeline

2026-06-09 - CVE-2026-41973 published to the National Vulnerability Database (NVD)
2026-06-09 - Last updated in NVD database

Technical Details for CVE-2026-41973

Vulnerability Analysis

The vulnerability resides in the permission control logic of the calls subsystem. Permission control flaws in [CWE-840] occur when the application enforces authorization rules inconsistently or skips required checks for sensitive operations. In this case, the calls component fails to correctly validate caller permissions before performing an action that affects device availability.

The flaw is reachable locally, without privileges or user interaction. The confidentiality, integrity, and availability impacts are all rated low, but the practical outcome described by the vendor is degradation of availability. A local process operating outside the expected permission boundary can invoke the affected code path and trigger the condition.

Root Cause

The root cause is a business logic error in how the calls component evaluates and applies permission constraints. The component does not enforce the expected authorization state before executing privileged actions tied to call handling. This allows a local actor to reach functionality that should require additional permission gating.

Attack Vector

Exploitation requires local access to the affected device. An attacker with the ability to run code on the device, for example through an installed application, can issue calls to the vulnerable interface. The flaw does not require user interaction and operates within a single security scope. The Huawei Security Bulletin should be consulted for the exact reproduction conditions and vulnerable interfaces. See the Huawei Security Bulletin for technical details.

Detection Methods for CVE-2026-41973

Indicators of Compromise

Unexpected crashes or restarts of the calls subsystem or telephony services on affected devices
Local applications invoking call-related APIs outside of expected user-initiated workflows
Anomalous denial-of-service patterns affecting call functionality without network-side cause

Detection Strategies

Review application permission usage logs for processes accessing telephony or call-related interfaces without a corresponding user action
Correlate availability incidents on affected devices with the install or execution of recently sideloaded applications
Monitor for repeated invocation of the affected interfaces by a single local process

Monitoring Recommendations

Enable verbose logging on telephony and permission enforcement components where supported by the platform
Track device health telemetry for repeated service restarts tied to the calls subsystem
Alert on third-party applications requesting telephony-related permissions outside their declared functionality

How to Mitigate CVE-2026-41973

Immediate Actions Required

Apply the security update from the June 2026 Huawei Security Bulletin to affected devices
Inventory managed mobile devices to identify Huawei models eligible for the update
Restrict installation of untrusted applications until the patch is deployed

Patch Information

Huawei addressed CVE-2026-41973 in the June 2026 consumer security bulletin. Administrators should consult the Huawei Security Bulletin for the specific firmware versions that contain the fix and apply updates through the standard device update channel.

Workarounds

Limit installation of applications to vetted sources such as official application stores
Enforce mobile device management (MDM) policies that block sideloaded applications on affected devices
Reduce the attack surface by removing unnecessary applications that request telephony permissions

bash

# Verify device build version on Huawei devices via ADB
adb shell getprop ro.build.version.incremental
adb shell getprop ro.build.display.id