# CVE-2024-56161: amd64-microcode: Improper signature verification in AMD CPU ROM microcode patch loader mayallow an attacker with local administrator p...

CVE-2024-56161 is fixed in amd64-microcode on 1 platform, first by amd64-microcode 3.20250311.1ubuntu0.24.04.1, released February 3, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2024-56161
- Priority: High
- CVSS: 7.2 (Medium)
- EPSS: 0.0053
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 3, 2025

## Description

Improper signature verification in AMD CPU ROM microcode patch loader mayallow an attacker with local administrator privilege to load malicious CPUmicrocode resulting in loss of confidentiality and integrity of aconfidential guest running under AMD SEV-SNP.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | amd64-microcode Debian 11.6 (bullseye) | 3.20250311.1~deb11u1 | [DLA-4098-1](https://patchblox.com/security/data/fix/linux/dla-4098-1.md) | Mar 31, 2025 |
| Linux | amd64-microcode Debian 12.15 (bookworm) | 3.20250311.1~deb12u1 | [DEBIAN-CVE-2024-56161](https://patchblox.com/security/data/fix/linux/debian-cve-2024-56161.md) | Feb 3, 2025 |
| Linux | amd64-microcode Debian 13.5 (trixie) | 3.20250311.1 | [DEBIAN-CVE-2024-56161](https://patchblox.com/security/data/fix/linux/debian-cve-2024-56161.md) | Feb 3, 2025 |
| Linux | amd64-microcode Debian 14 | 3.20250311.1 | [DEBIAN-CVE-2024-56161](https://patchblox.com/security/data/fix/linux/debian-cve-2024-56161.md) | Feb 3, 2025 |
| Linux | amd64-microcode Ubuntu 24.04.5 LTS (noble) | 3.20250311.1ubuntu0.24.04.1 | [amd64-microcode 3.20250311.1ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-amd64-microcode-3.20250311.1ubuntu0.24.04.1.md) | Feb 3, 2025 |
| Linux | amd64-microcode Ubuntu 24.10 (oracular) | 3.20250311.1ubuntu0.24.10.1 | [amd64-microcode 3.20250311.1ubuntu0.24.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-amd64-microcode-3.20250311.1ubuntu0.24.10.1.md) | Jan 16, 2026 |
| Linux | amd64-microcode Ubuntu 25.04 (plucky) | 3.20250311.1ubuntu0.25.04.1 | [amd64-microcode 3.20250311.1ubuntu0.25.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-amd64-microcode-3.20250311.1ubuntu0.25.04.1.md) | Jan 16, 2026 |

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Data as of 2026-11-08T13:06:02Z 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

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