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A potential vulnerability was reported in the BIOS of L13 Gen 6, L13 Gen 6 2-in-1, L14 Gen 6, and L16 Gen 2 ThinkPads which could result in Secure Boot being disabled even when configured as “On” in the BIOS setup menu. This issue only affects systems where Secure Boot is set to User Mode.

CVE-2026-0421 is a BIOS-level vulnerability identified in several Lenovo ThinkPad models, including L13 Gen 6, L13 Gen 6 2-in-1, L14 Gen 6, and L16 Gen 2. The vulnerability stems from an unchecked return value in the BIOS code, classified under CWE-252, which leads to a scenario where Secure Boot can be disabled despite being set to 'On' in the BIOS configuration. Secure Boot is a critical security feature designed to prevent unauthorized or malicious code from executing during the system boot process by verifying the digital signatures of bootloaders and OS components. This vulnerability only manifests when Secure Boot is configured in User Mode, a setting that allows user-level control over Secure Boot keys and policies. Exploiting this flaw requires local privileged access and user interaction, as indicated by the CVSS vector (AV:L/AC:L/PR:H/UI:P). The impact on confidentiality, integrity, and availability is high because disabling Secure Boot can allow attackers to load unsigned or malicious firmware or bootloaders, potentially leading to persistent malware infections or firmware rootkits that are difficult to detect or remove. Although no known exploits have been reported in the wild, the vulnerability's presence in widely used enterprise laptops makes it a significant concern. The lack of an official patch at the time of reporting necessitates immediate attention to mitigating controls. The CVSS v4.0 score of 7 reflects the high severity due to the potential for significant compromise of system security, despite the requirement for high privileges and user interaction.

Detailed information about CVE-2026-0421: CWE-252: Unchecked Return Value in Lenovo ThinkPad L13 Gen 6 BIOS affecting Lenovo ThinkPad L13 Gen 6 BIOS. Get real-t

CVE-2026-0421: CWE-252: Unchecked Return Value in Lenovo ThinkPad L13 Gen 6 BIOS - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-0421: CWE-252: Unchecked Return Value in Lenovo ThinkPad L13 Gen 6 BIOS

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