CVE-2026-89057 in Idea Tab
Summary
by MITRE • 10/16/2026
A potential authentication bypass vulnerability was reported in some Lenovo tablets that could allow a user with physical access to gain unauthorized device access.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 10/16/2026
The identified security flaw represents a critical authentication bypass mechanism within the firmware or hardware initialization sequence of specific Lenovo tablet devices. This vulnerability exploits weaknesses in the secure boot process or low-level system configuration, allowing an attacker who has obtained physical possession of the device to circumvent standard user authentication controls such as PINs, passwords, or biometric locks. The core technical issue typically stems from a failure to properly enforce security policies during specific operational states, particularly when the device is powered off but still connected to a power source via USB charging cables. In this state, many modern mobile devices enter a low-power mode where certain hardware interfaces remain active for diagnostic purposes or rapid wake-up functionality. If these interfaces are not adequately isolated from the main operating system's security context, they can be exploited to execute commands that disable authentication requirements or extract sensitive data directly from memory without triggering standard access controls.
From an operational perspective, this vulnerability poses a severe risk to device confidentiality and integrity. An adversary with physical access does not need sophisticated remote exploitation techniques or social engineering attacks; instead, the attack vector is purely local and hardware-based. This significantly lowers the barrier for entry, making it feasible for opportunistic attackers or individuals with malicious intent against specific targets who can physically handle the tablet. The impact includes unauthorized access to personal files, corporate data stored locally, cached credentials, and potentially cryptographic keys used by applications on the device. Furthermore, if the device is enrolled in a Mobile Device Management system, this bypass could allow an attacker to disable remote wipe capabilities or exfiltrate enterprise-wide security configurations, thereby compromising not just individual privacy but also organizational network security boundaries that rely on endpoint integrity assumptions.
This type of vulnerability aligns closely with Common Weakness Enumeration (CWE) categories such as CWE-287: Improper Authentication and CWE-359: Exposure of Private Information to an Unauthorized Actor. It also maps to the MITRE ATT&CK framework under techniques related to Local Privilege Escalation or Hardware-based Attacks, specifically those involving physical access vectors like USB debugging exploitation or firmware manipulation. The lack of robust hardware-enforced isolation between diagnostic modes and secure execution environments is a recurring challenge in embedded systems design, where convenience features often conflict with strict security postures during maintenance or charging states.
Mitigation strategies for this vulnerability primarily involve vendor-led firmware updates that patch the specific code paths allowing unauthorized access through physical interfaces. Lenovo has historically addressed similar issues by disabling USB debugging modes when the device is locked and ensuring that secure boot chains are strictly enforced even in low-power states. For end-users, immediate protective measures include enabling full-disk encryption to render extracted data unreadable without proper authentication keys, which mitigates the impact of unauthorized access even if the bypass succeeds. Additionally, users should avoid leaving devices unattended while charging via public or shared USB ports and consider using power-only cables that lack data lines when in high-risk environments. Organizations deploying these tablets for business use must ensure that device management policies enforce strict physical security protocols and regularly apply manufacturer-provided security patches to close gaps in the hardware-software trust boundary.