Description
GRUB2 does not call the module fini functions on exit, leading to Debian/Ubuntu's peimage GRUB2 module leaving UEFI system table hooks after exit. This lead to a use-after-free condition, and could possibly lead to secure boot bypass.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Debian | Debian based GNU GRUB | < 2.12-1ubuntu5 | 2.12-1ubuntu5 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | grub2 | 2.12-2 | — |
| Debian 13 | grub2 | 2.12-2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | grub2-signed | 1.202 | — |
| Ubuntu 24.04 LTS | grub2-unsigned | 2.12-1ubuntu7 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | grub2 +1 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | shim | 16.1-150300.4.31.3 | SUSE-SU-2026:0741-1 |
| SLES 15 SP6 | shim | 16.1-150300.4.31.3 | SUSE-SU-2026:0741-2 |
| SLES 15 SP5 | shim | 16.1-150300.4.31.3 | SUSE-SU-2026:0741-1 |
| SLES 15 SP4 | shim | 16.1-150300.4.31.3 | SUSE-SU-2026:0741-1 |
| SLES 12 SP5 | shim | 16.1-25.34.1 | SUSE-SU-2026:1414-1 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP6 | shim | 16.1-150300.4.31.3 | SUSE-SU-2026:0741-2 |
| SLES for SAP 15 SP5 | shim | 16.1-150300.4.31.3 | SUSE-SU-2026:0741-1 |
| SLES for SAP 15 SP4 | shim | 16.1-150300.4.31.3 | SUSE-SU-2026:0741-1 |
| SLE Micro 6.2 | shim | 16.1-160000.1.1 | SUSE-RU-2026:20683-1 |
| SLE Micro 6.1 | shim | 16.1-slfo.1.1_1.1 | SUSE-RU-2026:20056-1 |
| SLE Micro 6.0 | shim | 16.1-1.1 | SUSE-RU-2026:20004-1 |
| SLE Micro 5.5 | shim | 16.1-150300.4.31.3 | SUSE-SU-2026:0741-1 |
| SLE Micro 5.4 | shim | 16.1-150300.4.31.3 | SUSE-SU-2026:0741-1 |
| SLE Micro 5.3 | shim | 16.1-150300.4.31.3 | SUSE-SU-2026:0741-1 |
| SLE Micro 5.2 | shim | 16.1-150300.4.31.3 | SUSE-SU-2026:0741-1 |
| SLE HPC 15 SP5 | shim | 16.1-150300.4.31.3 | SUSE-SU-2026:0741-1 |
| SLE HPC 15 SP4 | shim | 16.1-150300.4.31.3 | SUSE-SU-2026:0741-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | shim | 16.1-160000.1.1 | openSUSE-RU-2026:20325-1 |
| openSUSE Leap 15.6 | shim | 16.1-150300.4.31.3 | SUSE-SU-2026:0741-1 |
Advisories 8
- WID-SEC-2024-0805 Grub2: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen BSI CERT-Bund (WID) · Aug 31, 2026
- SUSE-SU-2026:0741-2 Security update for shim SUSE / openSUSE Security Updates · Jun 17, 2026
- SUSE-SU-2026:1414-1 Security update for shim SUSE / openSUSE Security Updates · Apr 17, 2026
- openSUSE-RU-2026:20325-1 Recommended update for shim SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0741-1 Security update for shim SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-RU-2026:20004-1 Recommended update for shim SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-RU-2026:20683-1 Recommended update for shim SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-RU-2026:20056-1 Recommended update for shim SUSE / openSUSE Security Updates · Mar 23, 2026