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The GRUB2's shim_lock verifier allows non-kernel files to be loaded on shim-powered secure boot systems. Allowing such files to be loaded may lead to unverified code and modules to be loaded in GRUB2 breaking the secure boot trust-chain.

🗓️ 29 Jul 2023 07:00:00Reported by MicrosoftType 
mscve
 mscve🔗 msrc.microsoft.com👁 2 Views

Grub shim lock verifier may load non-kernel files on secure boot, risking unverified code and breaking the trust chain.

Related
Detection
ReporterTitlePublishedViews
Family
Tenable Nessus		Amazon Linux 2022 : grub2-common, grub2-efi-aa64, grub2-efi-aa64-cdboot (ALAS2022-2022-109)
7 Sep 202200:00
–nessus
Tenable Nessus		Amazon Linux 2023 : grub2-common, grub2-efi-aa64, grub2-efi-aa64-cdboot (ALAS2023-2023-020)
21 Mar 202300:00
–nessus
Tenable Nessus		Amazon Linux 2 : grub2 (ALAS-2023-2146)
20 Jul 202300:00
–nessus
Tenable Nessus		Alibaba Cloud Linux 3 : 0134: grub2, mokutil, shim, and shim-unsigned-x64 (ALINUX3-SA-2022:0134)
14 May 202500:00
–nessus
Tenable Nessus		Alibaba Cloud Linux 3 : 0164: grub2, mokutil, shim, and shim-unsigned-x64 (ALINUX3-SA-2022:0164)
14 May 202500:00
–nessus
Tenable Nessus		AlmaLinux 9 : grub2, mokutil, shim, and shim-unsigned-x64 (ALSA-2022:5099)
16 Nov 202200:00
–nessus
Tenable Nessus		EulerOS 2.0 SP10 : grub2 (EulerOS-SA-2022-2242)
17 Aug 202200:00
–nessus
Tenable Nessus		EulerOS 2.0 SP10 : grub2 (EulerOS-SA-2022-2255)
17 Aug 202200:00
–nessus
Tenable Nessus		EulerOS Virtualization 2.10.0 : grub2 (EulerOS-SA-2022-2865)
27 Dec 202200:00
–nessus
Tenable Nessus		EulerOS Virtualization 2.10.1 : grub2 (EulerOS-SA-2022-2883)
27 Dec 202200:00
–nessus
Rows per page
Vulners
Node
microsoftazl3_grub2_2.06-23Range<2.06-14
OR
microsoftazl3_grub2_2.06-14Range<2.06-14

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19 Feb 2026 09:02Current
7.2High risk
Vulners AI Score7.2
CVSS 3.16.7 - 7.8
EPSS0.00316
SSVC
grub bootloadershim lock verifiersecure bootnon kernel filesunverified codetrust chainsecurity risk
2