Description
GNU GRUB (aka GRUB2) through 2.12 does not use a constant-time algorithm for grub_crypto_memcmp and thus allows side-channel attacks.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GNU | GRUB2 | 2.00 – ≤ 2.12 | — |
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 | No fix yet | — |
| Debian 13 | grub2 | No fix yet | — |
| Debian 12 | grub2 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | grub2-signed +1 | No fix yet | — |
| Ubuntu 26.04 LTS | grub2-signed +1 | No fix yet | — |
| Ubuntu 25.10 | grub2-signed +1 | No fix yet | — |
| Ubuntu 24.04 LTS | grub2-signed +1 | No fix yet | — |
| Ubuntu 22.04 LTS | grub2-signed +1 | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | grub2-signed +1 | No fix yet | — |
| Ubuntu 18.04 LTS | grub2-signed +1 | No fix yet | — |
| Ubuntu 16.04 LTS | grub2-signed +1 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | grub2 +1 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | grub2 | 2.12-150700.19.13.2 | SUSE-SU-2025:02813-1 |
| SLES 15 SP6 | grub2 | 2.12-150600.8.34.1 | SUSE-SU-2025:02772-1 |
| SLES 12 SP5 | grub2 | 2.02-190.1 | SUSE-SU-2025:02725-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | grub2 | 2.12-160000.3.1 | SUSE-SU-2025:21212-1 |
| SLES 16.0 | grub2 | 2.12-160000.3.1 | SUSE-SU-2025:21212-1 |
| SLE Micro 6.2 | grub2 | 2.12-160000.3.1 | SUSE-SU-2025:21223-1 |
| SLE Micro 6.1 | grub2 | 2.12-slfo.1.1_2.1 | SUSE-SU-2025:20863-1 |
| SLE Micro 6.0 | grub2 | 2.12~rc1-7.1 | SUSE-SU-2025:20654-1 |
| SLE Micro 5.5 | grub2 | 2.06-150500.29.53.1 | SUSE-SU-2025:02706-1 |
| SLE Micro 5.4 | grub2 | 2.06-150400.11.63.1 | SUSE-SU-2025:02727-1 |
| SLE Micro 5.3 | grub2 | 2.06-150400.11.63.1 | SUSE-SU-2025:02727-1 |
| SLE Micro 5.2 | grub2 | 2.04-150300.22.58.1 | SUSE-SU-2025:02705-1 |
| SLE Micro 5.1 | grub2 | 2.04-150300.3.14.2 | SUSE-SU-2025:02724-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | grub2 | 2.12-56.1 | openSUSE-SU-2025:15400-1 |
| openSUSE Leap 16.0 | grub2 | 2.12-160000.3.1 | openSUSE-SU-2025:20163-1 |
| openSUSE Leap 15.6 | grub2 | 2.12-150600.8.34.1 | SUSE-SU-2025:02772-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | grub2 | No fix yet | — |
| Azure Linux 2 (CBL-Mariner) | grub2 | No fix yet | — |
Advisories 13
- openSUSE-SU-2025:20163-1 Security update for grub2 SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15400-1 grub2-2.12-56.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:21212-1 Security update for grub2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20863-1 Security update for grub2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20654-1 Security update for grub2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:21223-1 Security update for grub2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02813-1 Recommended update for grub2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:02725-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:02706-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:02727-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:02724-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:02705-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:02772-1 Recommended update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026