# CVE-2018-3640: intel-microcode: Systems with microprocessors utilizing speculative execution and that perform speculative reads of system registers m...

CVE-2018-3640 is fixed in intel-microcode on 1 platform by intel-microcode 3.20180807a.0ubuntu0.18.04.1 (version 3.20180807a.0ubuntu0.18.04.1), released August 14, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-3640
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0714
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 21, 2018

## Description

Systems with microprocessors utilizing speculative execution and that perform speculative reads of system registers may allow unauthorized disclosure of system parameters to an attacker with local user access via a side-channel analysis, aka Rogue System Register Read (RSRE), Variant 3a.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | intel-microcode Ubuntu 18.04.6 LTS (bionic) | 3.20180807a.0ubuntu0.18.04.1 | [intel-microcode 3.20180807a.0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-intel-microcode-3.20180807a.0ubuntu0.18.04.1.md) | Aug 14, 2018 |

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Data as of 2026-11-07T12:40:37Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo