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CVE-2020-26541

22
FAUCET Score

CVE-2020-26541 describes a medium-severity vulnerability in the Linux kernel (through version 5.8.13) where the Secure Boot Forbidden Signature Database (dbx) protection mechanism is not properly enforced, affecting certs/blacklist.c and certs/system_keyring.c. This flaw could allow a highly privileged attacker, with user interaction, to achieve high impact on confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code (e.g., Metasploit, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 5.8.13CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
0.6
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.53%
Probability of exploitation in next 30 days
EPSS Percentile
41.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0053 is in the 83rd percentile among its peer group of 177 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (21)

microsoftpatch availablevia msrc
Product: 16840-16820Fixed in: -
microsoftpatch availablevia msrc
Product: cm1 kernel 5.10.57.1-1 on CBL Mariner 1.0Fixed in: -
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: kernel-rt-0:4.18.0-305.7.1.rt7.79.el8_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.1 Extended Update SupportFixed in: kernel-0:4.18.0-147.51.1.el8_1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Extended Update SupportFixed in: kernel-rt-0:4.18.0-193.60.2.rt13.112.el8_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Extended Update SupportFixed in: kernel-0:4.18.0-193.60.2.el8_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Migration Toolkit for Containers 1.4Fixed in: rhmtc/openshift-migration-controller-rhel8:v1.4.6-4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Migration Toolkit for Containers 1.4Fixed in: rhmtc/openshift-migration-log-reader-rhel8:v1.4.6-4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Migration Toolkit for Containers 1.4Fixed in: rhmtc/openshift-migration-must-gather-rhel8:v1.4.6-4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Migration Toolkit for Containers 1.4Fixed in: rhmtc/openshift-migration-operator-bundle:v1.4.6-5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Migration Toolkit for Containers 1.4Fixed in: rhmtc/openshift-migration-registry-rhel8:v1.4.6-4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Migration Toolkit for Containers 1.4Fixed in: rhmtc/openshift-migration-rsync-transfer-rhel8:v1.4.6-4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Migration Toolkit for Containers 1.4Fixed in: rhmtc/openshift-migration-ui-rhel8:v1.4.6-4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Migration Toolkit for Containers 1.4Fixed in: rhmtc/openshift-migration-velero-plugin-for-aws-rhel8:v1.4.6-4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Migration Toolkit for Containers 1.4Fixed in: rhmtc/openshift-migration-velero-plugin-for-gcp-rhel8:v1.4.6-3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Migration Toolkit for Containers 1.4Fixed in: rhmtc/openshift-migration-velero-plugin-for-microsoft-azure-rhel8:v1.4.6-4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Migration Toolkit for Containers 1.4Fixed in: rhmtc/openshift-migration-velero-restic-restore-helper-rhel8:v1.4.6-5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Migration Toolkit for Containers 1.4Fixed in: rhmtc/openshift-migration-velero-rhel8:v1.4.6-5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Migration Toolkit for Containers 1.4Fixed in: rhmtc/openshift-velero-plugin-rhel8:v1.4.6-4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: kernel-0:4.18.0-305.7.1.el8_4
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-alt

Vendor Advisories (2)

microsoft2020-Oct/CVE-2020-26541Moderate

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.

Oct 13, 2020
redhatCVE-2020-26541Moderate

kernel: security bypass in certs/blacklist.c and certs/system_keyring.c

Sep 15, 2020

References

lkml.org / lkml/2020/9/15/1871
ExploitVendor Advisory