CVE-2025-61661
Grub2: grub2: out-of-bounds write via malicious usb device
Reported by redhat · Published November 18, 2025
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.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| grub2-efi-aa64-ec2 | Amazon Linux | 1:2.06-61.amzn2023.0.21, 1:2.06-14.amzn2.0.7 |
| grub2-efi-x64 | Amazon Linux | 1:2.06-61.amzn2023.0.21, 1:2.06-14.amzn2.0.7 |
| grub2-efi-x64-ec2 | Amazon Linux | 1:2.06-61.amzn2023.0.21, 1:2.06-14.amzn2.0.7 |
| grub2-efi-x64-cdboot | Amazon Linux | 1:2.06-61.amzn2023.0.21, 1:2.06-14.amzn2.0.7 |
| grub2-pc-modules | Amazon Linux | 1:2.06-61.amzn2023.0.21, 1:2.06-14.amzn2.0.7 |
| grub2-efi-x64-modules | Amazon Linux | 1:2.06-61.amzn2023.0.21, 1:2.06-14.amzn2.0.7 |
| grub2-efi-aa64-cdboot | Amazon Linux | 1:2.06-61.amzn2023.0.21, 1:2.06-14.amzn2.0.7 |
| grub2-tools-minimal | Amazon Linux | 1:2.06-61.amzn2023.0.21, 1:2.06-14.amzn2.0.7 |
| grub2-tools-extra | Amazon Linux | 1:2.06-61.amzn2023.0.21, 1:2.06-14.amzn2.0.7 |
| grub2 | git.savannah.gnu.org | 2.14 |
| grub2-efi-aa64 | Amazon Linux | 1:2.06-61.amzn2023.0.21, 1:2.06-14.amzn2.0.7 |
| grub2 | Amazon Linux | 1:2.06-14.amzn2.0.7 |
7 more packages have a fixed version. See every fix in Lookup.
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| GNU | grub2 | 0 |
| 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 | |
| Red Hat | Red Hat OpenShift Container Platform 4 | |
| amazon:2023 | grub2-efi-aa64-ec2 | 0 |
| amazon:2023 | grub2-efi-x64 | 0 |
| amazon:2 | grub2-efi-x64-ec2 | 0 |
| amazon:2 | grub2-efi-x64-cdboot | 0 |
| Red Hat | Red Hat In-Vehicle Operating System 1 | |
| amazon:2 | grub2-pc-modules | 0 |
| amazon:2023 | grub2-efi-x64-modules | 0 |
| amazon:2 | grub2-efi-x64 | 0 |
| amazon:2 | grub2-efi-aa64-cdboot | 0 |
| amazon:2 | grub2-tools-minimal | 0 |
| Red Hat | Red Hat Enterprise Linux 10 | |
| amazon:2023 | grub2-efi-x64-ec2 | 0 |
| amazon:2 | grub2-tools-extra | 0 |
…and 31 more
Timeline
- Nov 18, 2025 CVE Published
- Nov 19, 2025 EPSS Score (30 in total, the first dated here)
- Mar 26, 2026 Coalition ESS Score (2 in total, the first dated here)
- Mar 29, 2026 Security Advisory (63 in total, the first dated here)
- Sep 16, 2026 Distribution Patch (21 in total, the first dated here)
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2025-61661
vulnetix vdb fixes CVE-2025-61661Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/CVE-2025-61661/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart
References
- vdb-entryx_refsource_REDHAT
- RHBZ#2413827 issue-trackingx_refsource_REDHAT
- http://www.openwall.com/lists/oss-security/2025/11/18/8 url