Lenovo ThinkPad L13 Gen 6 BIOS Secure Boot return value

CVSS Meta Temp Score
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Lenovo ThinkPad L13 Gen 6 BIOS, ThinkPad L13 Gen 6 2 in 1 BIOS, ThinkPad L14 Gen 6 BIOS and ThinkPad L16 Gen 2 BIOS. The affected element is an unknown function of the component Secure Boot. The manipulation leads to return value. This vulnerability is uniquely identified as CVE-2026-0421. Local access is required to approach this attack. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Lenovo ThinkPad L13 Gen 6 BIOS, ThinkPad L13 Gen 6 2 in 1 BIOS, ThinkPad L14 Gen 6 BIOS and ThinkPad L16 Gen 2 BIOS (affected version unknown). This issue affects an unknown functionality of the component Secure Boot. The manipulation with an unknown input leads to a return value vulnerability. Using CWE to declare the problem leads to CWE-252. The product does not check the return value from a method or function, which can prevent it from detecting unexpected states and conditions. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at support.lenovo.com. The identification of this vulnerability is CVE-2026-0421 since 12/04/2025. The exploitation is known to be easy. An attack has to be approached locally. Additional levels of successful authentication are required for exploitation. Neither technical details nor an exploit are publicly available.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at EUVD (EUVD-2026-2664) and CERT Bund (WID-SEC-2026-0134). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Lenovo BIOS

Productinfo

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.6
VulDB Meta Temp Score: 6.4

VulDB Base Score: 6.7
VulDB Temp Score: 6.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.5
CNA Vector (lenovo): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Return value
CWE: CWE-252 / CWE-253
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Timelineinfo

12/04/2025 CVE reserved
01/15/2026 +42 days Advisory disclosed
01/15/2026 +0 days VulDB entry created
01/16/2026 +1 days VulDB entry last update

Sourcesinfo

Vendor: lenovo.com

Advisory: support.lenovo.com
Status: Confirmed

CVE: CVE-2026-0421 (🔒)
GCVE (CVE): GCVE-0-2026-0421
GCVE (VulDB): GCVE-100-341237
EUVD: 🔒
CERT Bund: WID-SEC-2026-0134 - Lenovo BIOS: Mehrere Schwachstellen

Entryinfo

Created: 01/15/2026 09:56
Updated: 01/16/2026 20:50
Changes: 01/15/2026 09:56 (73), 01/15/2026 19:57 (1), 01/16/2026 20:50 (7)
Complete: 🔍
Cache ID: 216::103

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