CVE-2020-26541

MEDIUMNVD 6.56.5

6.5

The Linux kernel through 5.8.13 does not properly enforce the Secure Boot Forbidden Signature Database (aka dbx) protection mechanism. This affects certs/blacklist.c and certs/system_keyring.c.

CVSS v3: 6.5
EG Score: 6.5(low)
EPSS: 29.4%
KEV: Not listed

Published

October 2, 2020

Last Modified

November 21, 2024

References (2)

cve@mitrehttps://lkml.org/lkml/2020/9/15/1871
af854a3a-2127-422b-91ae-364da2661108https://lkml.org/lkml/2020/9/15/1871

Patch Availability(10)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	linux-modules-extra-5.4.0-1059-gcp (5.4.0-1059.63) @ focal	2026-05-23	ubuntu
ubuntu	linux-oem-20.04b (5.10.0.1049.51) @ focal	2026-05-23	ubuntu
ubuntu	linux-image-lowlatency (5.11.0.34.36) @ hirsute	2026-05-23	ubuntu
ubuntu	linux-azure-5.8-headers-5.8.0-1043 (5.8.0-1043.46~20.04.1) @ focal	2026-05-23	ubuntu
redhat	rhmtc/openshift-velero-plugin-rhel8:v1.4.6-4	2021-07-21	redhat
redhat	kernel-rt-0:4.18.0-193.60.2.rt13.112.el8_2	2021-07-20	redhat
redhat	kernel-0:4.18.0-193.60.2.el8_2	2021-07-20	redhat
redhat	kernel-0:4.18.0-147.51.1.el8_1	2021-07-07	redhat
redhat	kernel-rt-0:4.18.0-305.7.1.rt7.79.el8_4	2021-06-29	redhat
redhat	kernel-0:4.18.0-305.7.1.el8_4	2021-06-29	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

All Vendor Advisories

(11)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 13× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:46 UTCOSV refresh
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore

Frequently asked(5)

What is CVE-2020-26541?

CVE-2020-26541 is a medium vulnerability published on October 2, 2020. The Linux kernel through 5.8.13 does not properly enforce the Secure Boot Forbidden Signature Database (aka dbx) protection mechanism. This affects certs/blacklist.c and certs/system_keyring.c.

When was CVE-2020-26541 disclosed?

CVE-2020-26541 was first published in the National Vulnerability Database on October 2, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-26541 actively exploited?

CVE-2020-26541 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 29.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-26541?

CVE-2020-26541 has a CVSS v3 base score of 6.5 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..

How do I remediate CVE-2020-26541?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-26541, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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