Description
A flaw was found in grub2. When reading tar files, grub2 allocates an internal buffer for the file name. However, it fails to properly verify the allocation against possible integer overflows. It's possible to cause the allocation length to overflow with a crafted tar file, leading to a heap out-of-bounds write. This flaw eventually allows an attacker to circumvent secure boot protections.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | grub2 | ≤ 2.12 | — |
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — |
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 | 2.12-6 | — |
| Debian 13 | grub2 | 2.12-6 | — |
| Debian 12 | grub2 | 2.06-13+deb12u2 | — |
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 SP6 | grub2 | 2.12-150600.8.18.2 | SUSE-SU-2025:0586-1 |
| SLES 15 SP5 | grub2 | 2.06-150500.29.43.2 | SUSE-SU-2025:0587-1 |
| SLES 15 SP4 | grub2 | 2.06-150400.11.55.2 | SUSE-SU-2025:0588-1 |
| SLES 15 SP3 | grub2 | 2.04-150300.22.52.3 | SUSE-SU-2025:0607-1 |
| SLES 12 SP5 | grub2 | 2.02-181.2 | SUSE-SU-2025:0629-1 |
Show 18 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP5 | grub2 | 2.06-150500.29.43.2 | SUSE-SU-2025:0587-1 |
| SLES for SAP 15 SP4 | grub2 | 2.06-150400.11.55.2 | SUSE-SU-2025:0588-1 |
| SLES for SAP 15 SP3 | grub2 | 2.04-150300.22.52.3 | SUSE-SU-2025:0607-1 |
| SLE Micro 6.1 | grub2 | 2.12-slfo.1.1_2.1 | SUSE-SU-2025:20863-1 |
| SLE Micro 6.0 | grub2 | 2.12~rc1-6.1 | SUSE-SU-2025:20511-1 |
| SLE Micro 5.5 | grub2 | 2.06-150500.29.43.2 | SUSE-SU-2025:0587-1 |
| SLE Micro 5.4 | grub2 | 2.06-150400.11.55.2 | SUSE-SU-2025:0588-1 |
| SLE Micro 5.3 | grub2 | 2.06-150400.11.55.2 | SUSE-SU-2025:0588-1 |
| SLE Micro 5.2 | grub2 | 2.04-150300.22.52.3 | SUSE-SU-2025:0607-1 |
| SLE Micro 5.1 | grub2 | 2.04-150300.3.11.1 | SUSE-SU-2025:01961-1 |
| SLE HPC 15 SP5 | grub2 | 2.06-150500.29.43.2 | SUSE-SU-2025:0587-1 |
| SLE HPC 15 SP4 | grub2 | 2.06-150400.11.55.2 | SUSE-SU-2025:0588-1 |
| SLE HPC 15 SP3 | grub2 | 2.04-150300.22.52.3 | SUSE-SU-2025:0607-1 |
| SUSE Manager Server Module 4.3 | grub2 | 2.06-150400.11.55.2 | SUSE-SU-2025:0588-1 |
| SUSE Manager Server 4.3 | grub2 | 2.06-150400.11.55.2 | SUSE-SU-2025:0588-1 |
| SUSE Manager Proxy Module 4.3 | grub2 | 2.06-150400.11.55.2 | SUSE-SU-2025:0588-1 |
| SUSE Manager Proxy 4.3 | grub2 | 2.06-150400.11.55.2 | SUSE-SU-2025:0588-1 |
| SUSE Enterprise Storage 7.1 | grub2 | 2.04-150300.22.52.3 | SUSE-SU-2025:0607-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | grub2 | 2.12-35.1 | openSUSE-SU-2025:14822-1 |
| openSUSE Leap 15.6 | grub2 | 2.12-150600.8.18.2 | SUSE-SU-2025:0586-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | grub2-pc +16 | 1:2.06-61.amzn2023.0.16 | ALAS2023-2025-937 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | grub2 | 2.06-25 | — |
| Azure Linux 2 (CBL-Mariner) | grub2 | 2.06-15 | — |
Advisories 11
- WID-SEC-2025-0396 Grub: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 15, 2026
- SUSE-SU-2025:20863-1 Security update for grub2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20511-1 Security update for grub2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:01961-1 Security update for grub2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:0586-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0629-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0607-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:0587-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2025:14822-1 grub2-2.12-35.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- SUSE-SU-2025:0588-1 Security update for grub2 SUSE / openSUSE Security Updates · May 2, 2025
- ALAS2023-2025-937 Moderate: grub2 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Apr 14, 2025