shim-review

This repo is for review of requests for signing shim. To create a request for review: clone this repo preferably fork it edit the template below add the shim.efi to be signed add build logs add any additional binaries/certificates/SHA256 hashes that may be needed commit all of that tag it with a...

Super-UEFIinSecureBoot-Disk

Super UEFIinSecureBoot Disk Super UEFIinSecureBoot Disk is a proof-of-concept not actively maintained or enhanced bootable image with GRUB2 bootloader designed to be used as a base for recovery USB flash drives. Key feature: disk is fully functional with UEFI Secure Boot mode activated. It can...

CVE-2020-14372

CVE-2020-14372: Bypassing not so Secure Boot with one "simple trick" Vulnerability details One day I typed "help" into GRUB2's console and saw some really "fun" commands: readbyte ADDR: Read 8-bit value from ADDR writebyte ADDR VAL: Write 8-bit value VAL to ADDR I immediately thought I found the...

CLEANSTART-2024-ST49849 Integer overflows were discovered in the functions grub_cmd_initrd and grub_initrd_init in the efilinux component of GRUB2, as shipped in Debian, Red Hat, and Ubuntu (the functionality is not inclu...

Security vulnerability affects the grub package. Integer overflows were discovered in the functions grubcmdinitrd and grubinitrdinit in the efilinux component of GRUB2, as shipped in Debian, Red Hat, and Ubuntu the functionality is not included in GRUB2 upstream, leading to a heap-based buffer...

CVE-2025-0690

CVE-2025-0690: Integer Overflow Vulnerability in GRUB2 🛡️ Overview CVE-2025-0690 is a critical integer overflow vulnerability in the GRUB2 boot loader, allowing arbitrary code execution and Secure Boot bypass. This flaw affects systems that rely on GRUB2 for secure boot, exposing the system before...

slot2

slot2 slot2: a two-stage UEFI GRUB2 bootkit that persists a pre-OS networked implant on Amazon Linux 2023 on AWS EC2 UEFI x8664. by cenobyte [email protected] 2026 https://github.com/cenobyte-vincit/slot2 Summary slot2 is a bootkit for Amazon Linux 2023 on EC2. The AWS EC2 UEFI firmware load...

Astra Linux – Vulnerability in grub2

A flaw was discovered in grub2 in versions prior to 2.06. The Setparamprefix function in the menu rendering code performs a length calculation based on the assumption that expressing a single quoted character would require 3 characters. However, in reality, it requires 4 characters. This allows a...

Astra Linux – Vulnerability in grub2

The GRUB2’s shimlock 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 being loaded in GRUB2, thereby breaking the secure boot trust-chain...

Astra Linux – vulnerability in grub2

A flaw was found in grub2: the grubextcmddispatcher function calls grubarglistalloc to allocate memory for the grub’s argument list. However, it fails to check whether the memory allocation succeeds. If it does not, a NULL pointer is processed by the parseoption function, causing grub to crash or...

Astra Linux – Vulnerability in grub2

Integer underflow in grubnetrecvip4packets; A malicious IP packet can cause an integer underflow in the grubnetrecvip4packets function, affecting the rsm-totallen value. Under certain circumstances, the totallen value may wrap around to a small integer number, which will be used in memory...

Astra Linux – Vulnerability in grub2

A flaw was discovered in grub2 in versions prior to 2.06. The rmmod implementation allows the unloading of a module that serves as a dependency without checking whether any other dependent modules are still loaded, leading to a “use-after-free” scenario. This could allow arbitrary code to be...

Astra Linux – Vulnerability in grub2

A flaw was discovered in grub2. When attempting to mount an HFS+ partition, the hfsplus filesystem driver does not correctly set the ERRNO value. This issue may lead to a NULL pointer access...

Astra Linux – Vulnerability in grub2

A vulnerability related to operations after freeing memory has been discovered in GRUB’s gettext module. This flaw arises from a programming error where the gettext command remains registered in memory even after its associated module is unloaded. An attacker can exploit this condition by invokin...

Rocky Linux 8.6 [CIQ] Security Update: grub2-common / grub2-efi-aa64 / grub2-efi-aa64-cdboot / etc Multiple Vulnerabilities (ciqsa-2026_1601)

The Rocky Linux 8.6 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ ciqsa-20261601 advisory. This advisory aggregates security fixes for the grub2 SRPM in CIQ LTS 8.6. It addresses 26 CVEs: CVE-2021-3981, CVE-2021-20233, CVE-2020-14310,...

CVE-2026-97876

A flaw was found in GRUB2. The bootloader insufficiently validates memory addresses passed to the serial configuration command, allowing arbitrary system memory to be targeted instead of a legitimate serial communication device. A local attacker with control over GRUB's boot configuration can...

Rocky Linux 9.2 [CIQ] Security Update: grub2-common / grub2-debuginfo / grub2-efi-aa64 / etc Multiple Vulnerabilities (ciqsa-2026_0426)

The Rocky Linux 9.2 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ ciqsa-20260426 advisory. This advisory aggregates security fixes for the grub2 SRPM in CIQ LTS 9.2. It addresses 45 CVEs: CVE-2021-3981, CVE-2021-20233, CVE-2022-28734,...

Rocky Linux 8 [CIQ] Security Update: shim-unsigned-aarch64 Multiple Vulnerabilities (crlsa-2021_1734)

The Rocky Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the CIQ crlsa-20211734 advisory. grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled CVE-2020-14372 grub2: Use-after-free in rmmod command...

Rocky Linux 8 [CIQ] Security Update: grub2-common / grub2-debuginfo / grub2-debugsource / grub2-efi-aa64 / etc Multiple Vulnerabilities (crlsa-2024_3184)

The Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-20243184 advisory. grub2: grub2-set-bootflag can be abused by local pseudo-users CVE-2024-1048 grub2: Out-of-bounds write at fs/ntfs.c may lead to unsigned code execution...

Rocky Linux 8 [CIQ] Security Update: grub2-common / grub2-debuginfo / grub2-efi-ia32 / etc Multiple Vulnerabilities (ciqsa-2026_0603)

The Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ ciqsa-20260603 advisory. This advisory aggregates security fixes for the grub2 SRPM in CIQ FIPS 8.10 Compliant. It addresses 3 CVEs: CVE-2024-1048, CVE-2023-4693, CVE-2023-4692...

Rocky Linux 9 [CIQ] Security Update: grub2-common / grub2-efi-aa64 / grub2-efi-aa64-cdboot / etc Multiple Vulnerabilities (crlsa-2025_6990)

The Rocky Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-20256990 advisory. grub2: reader/jpeg: Heap OOB Write during JPEG parsing CVE-2024-45774 grub2: commands/extcmd: Missing check for failed allocation CVE-2024-45775 grub2:...