# CVE-2025-61661: Grub2: grub2: out-of-bounds write via malicious usb device CVE-2025-61661 is fixed in 25 products on 1 platform, first by DEBIAN-CVE-2025-61661, released November 18, 2025. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2025-61661 - Priority: Routine - CVSS: 4.8 (Moderate) - EPSS: 0.0021 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Nov 18, 2025 - Weakness: Incorrect Calculation of Buffer Size - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-61661 ## 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | grub2 Debian 14 | 2.14-1 | [DEBIAN-CVE-2025-61661](https://patchblox.com/security/data/fix/linux/debian-cve-2025-61661.md) | Nov 18, 2025 | | Linux | grub2 opensuse-leap 15.6 | 2.12-150600.8.44.2 | [SUSE-SU-2025:4196-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4196-1.md) | Nov 24, 2025 | | Linux | grub2 opensuse-leap 16.0 | 2.12-160000.3.1 | [OPENSUSE-SU-2025:20163-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-20163-1.md) | Dec 15, 2025 | | Linux | grub2 sles 15.6 | 2.12-150600.8.44.2 | [SUSE-SU-2025:4196-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4196-1.md) | Nov 24, 2025 | | Linux | grub2 sles 15.7 | 2.12-150700.19.19.1 | [SUSE-SU-2025:4305-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-4305-1.md) | Nov 28, 2025 | | Linux | grub2 sles 16.0 | 2.12-160000.3.1 | [SUSE-SU-2025:21212-1](https://patchblox.com/security/data/fix/linux/suse-su-2025-21212-1.md) | Dec 15, 2025 | | Linux | grub2-common amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-debuginfo amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-debugsource amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-efi-aa64 amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-efi-aa64-cdboot amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-efi-aa64-ec2 amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-efi-aa64-modules amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-efi-x64 amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-efi-x64-cdboot amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-efi-x64-ec2 amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-efi-x64-modules amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-emu amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-emu-debuginfo amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-emu-modules amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-pc amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-pc-modules amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-tools amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-tools-debuginfo amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-tools-efi amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-tools-efi-debuginfo amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-tools-extra amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-tools-extra-debuginfo amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-tools-minimal amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | | Linux | grub2-tools-minimal-debuginfo amzn 2023 | 1:2.06-61.amzn2023.0.21 | [ALAS2023-2025-1342](https://patchblox.com/security/data/fix/linux/alas2023-2025-1342.md) | Jan 7, 2026 | --- Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.