Description
A vulnerability has been identified in the GRUB (Grand Unified Bootloader) component. This flaw occurs because the bootloader mishandles string conversion when reading information from a USB device, allowing an attacker to exploit inconsistent length values. A local attacker can connect a maliciously configured USB device during the boot sequence to trigger this issue. A successful exploitation may lead GRUB to crash, leading to a Denial of Service. Data corruption may be also possible, although given the complexity of the exploit the impact is most likely limited.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GNU | grub2 | ≤ 2.14 | — |
| 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 | 2.14-1 | — |
| 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 | 2.12-150700.19.19.1 | SUSE-SU-2025:4305-1 |
| SLES 15 SP6 | grub2 | 2.12-150600.8.44.2 | SUSE-SU-2025:4196-1 |
| SLES 12 SP5 | grub2 | 2.02-193.1 | SUSE-SU-2025:4197-1 |
Show 8 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_3.1 | SUSE-SU-2025:21062-1 |
| SLE Micro 5.5 | grub2 | 2.06-150500.29.59.1 | SUSE-SU-2025:4152-1 |
| SLE Micro 5.4 | grub2 | 2.06-150400.11.66.1 | SUSE-SU-2025:4224-1 |
| SLE Micro 5.3 | grub2 | 2.06-150400.11.66.1 | SUSE-SU-2025:4224-1 |
| SLE Micro 5.2 | grub2 | 2.04-150300.22.61.1 | SUSE-SU-2025:4143-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | grub2 | 2.12-67.1 | openSUSE-SU-2025:15749-1 |
| openSUSE Leap 16.0 | grub2 | 2.12-160000.3.1 | openSUSE-SU-2025:20163-1 |
| openSUSE Leap 15.6 | grub2 | 2.12-150600.8.44.2 | SUSE-SU-2025:4196-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | grub2-pc +16 | 1:2.06-61.amzn2023.0.21 | ALAS2023-2025-1342 |
| Amazon Linux 2 | grub2 +17 | 1:2.06-14.amzn2.0.7 | ALAS2-2025-3107 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | grub2 | 2.06-26 | — |
| Azure Linux 2 (CBL-Mariner) | grub2 | 2.06-16 | — |
Advisories 15
- WID-SEC-2025-2638 Grub: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 15, 2026
- WID-SEC-2026-0778 Dell Secure Connect Gateway Policy Manager: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 11, 2026
- openSUSE-SU-2025:20163-1 Security update for grub2 SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15749-1 grub2-2.12-67.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:4224-1 Security update for grub2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:4197-1 Security update for grub2 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-2025:4196-1 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-2025:21062-1 Security update for grub2 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:4152-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:4143-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:4305-1 Security update for grub2 SUSE / openSUSE Security Updates · Feb 4, 2026
- ALAS2023-2025-1342 Moderate: grub2 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jan 7, 2026
- ALAS2-2025-3107 Moderate: grub2 security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 5, 2026
References
- https://access.redhat.com/security/cve/CVE-2025-61661 vdb-entry
- RHBZ#2413827 issue-tracking