# CVE-2025-29943: amd64-microcode: Write what were condition within AMD CPUs may allow an admin-privileged attacker to modify the configuration of the C...

CVE-2025-29943 is fixed in amd64-microcode on 1 platform, first by amd64-microcode 3.20251202.1ubuntu0.25.10.1, released January 16, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-29943
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 16, 2026

## Description

Write what were condition within AMD CPUs may allow an admin-privileged attacker to modify the configuration of the CPU pipeline potentially resulting in the corruption of the stack pointer inside an SEV-SNP guest.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | amd64-microcode Debian 14 | 3.20251202.1 | [DEBIAN-CVE-2025-29943](https://patchblox.com/security/data/fix/linux/debian-cve-2025-29943.md) | Jan 16, 2026 |
| Linux | amd64-microcode Ubuntu 24.04.5 LTS (noble) | 3.20251202.1ubuntu0.24.04.1 | [amd64-microcode 3.20251202.1ubuntu0.24.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-amd64-microcode-3.20251202.1ubuntu0.24.04.1.md) | May 12, 2026 |
| Linux | amd64-microcode Ubuntu 25.10 (questing) | 3.20251202.1ubuntu0.25.10.1 | [amd64-microcode 3.20251202.1ubuntu0.25.10.1](https://patchblox.com/security/data/fix/linux/ubuntu-questing-amd64-microcode-3.20251202.1ubuntu0.25.10.1.md) | Jan 16, 2026 |
| Linux | amd64-microcode Ubuntu 26.04.1 LTS (resolute) | 3.20251202.1ubuntu1 | [amd64-microcode 3.20251202.1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-amd64-microcode-3.20251202.1ubuntu1.md) | May 12, 2026 |

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Data as of 2026-11-09T01:18:40Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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