CVE-2020-26541 — Improper Verification of Cryptographic Signature in Linux

CWE-347 — Improper Verification of Cryptographic Signature21 documents10 sources
Severity
6.5MEDIUMNVD
OSV7.8
EPSS
0.1%
top 70.24%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
Linux KernelDebian LinuxPaloalto Pan-os+1 more
Timeline
PublishedOct 2
Latest updateFeb 14

Description

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 vector

CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:HExploitability: 0.6 | Impact: 5.9

Affected Packages6 packages

▶Debianlinux/linux_kernel< 5.10.70-1+3
▶Ubuntulinux/linux_kernel< 5.4.0-92.103+1
▶NVDlinux/linux_kernel5.8.13
▶debiandebian/linux< linux 5.14.6-1 (bookworm)

🔴Vulnerability Details

9
GHSA
GHSA-f823-qm69-5873: The Linux kernel through 5↗2022-05-24
▶
OSV
linux, linux-gcp, linux-gcp-5.4, linux-hwe-5.4 regression↗2022-01-12
▶
OSV
linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-bluefield, linux-gcp, linux-gcp-5.4, linux-gke, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-ibm, linux-kvm, l↗2022-01-06
▶
OSV
linux-azure-5.8 vulnerabilities↗2021-10-21
▶
OSV
linux-oem-5.10 vulnerabilities↗2021-10-06
▶

📋Vendor Advisories

9
Palo Alto
PAN-SA-2024-0001 Informational Bulletin: Impact of OSS CVEs in PAN-OS↗2024-02-14
▶
Ubuntu
Linux kernel regression↗2022-01-12
▶
Ubuntu
Linux kernel vulnerabilities↗2022-01-06
▶
Ubuntu
Linux kernel (Azure) vulnerabilities↗2021-10-21
▶
Ubuntu
Linux kernel (OEM) vulnerabilities↗2021-10-06
▶

💬Community

2
Bugzilla
CVE-2020-26541 kernel: security bypass in certs/blacklist.c and certs/system_keyring.c [fedora-all]↗2020-10-08
▶
Bugzilla
CVE-2020-26541 kernel: security bypass in certs/blacklist.c and certs/system_keyring.c↗2020-10-08
▶