Lenovo ThinkPad BIOS SecureBoot Disable Vulnerability
CVE-2026-0421 Published on January 14, 2026
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.
Vulnerability Analysis
CVE-2026-0421 can be exploited with local system access, requires user interaction and user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
Unchecked Return Value
The software does not check the return value from a method or function, which can prevent it from detecting unexpected states and conditions. Two common programmer assumptions are "this function call can never fail" and "it doesn't matter if this function call fails". If an attacker can force the function to fail or otherwise return a value that is not expected, then the subsequent program logic could lead to a vulnerability, because the software is not in a state that the programmer assumes. For example, if the program calls a function to drop privileges but does not check the return code to ensure that privileges were successfully dropped, then the program will continue to operate with the higher privileges.
Products Associated with CVE-2026-0421
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Affected Versions
Lenovo ThinkPad L13 Gen 6 BIOS:- Before 1.10 is affected.
- Before 1.10 is affected.
- Before 1.06 is affected.
- Before 1.06 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.