CVE-2018-12130

Public on

Last Modified: UTC

Description

A flaw was found in the implementation of the "fill buffer", a mechanism used by modern CPUs when a cache-miss is made on L1 CPU cache. If an attacker can generate a load operation that would create a page fault, the execution will continue speculatively with incorrect data from the fill buffer while the data is fetched from higher level caches. This response time can be measured to infer data in the fill buffer.

A flaw was found in the implementation of the "fill buffer", a mechanism used by modern CPUs when a cache-miss is made on L1 CPU cache. If an attacker can generate a load operation that would create a page fault, the execution will continue speculatively with incorrect data from the fill buffer while the data is fetched from higher level caches. This response time can be measured to infer data in the fill buffer.

Statement

Red Hat Product Security is aware of this issue. Updates will be released as they become available. For additional information, please refer to the 'Vulnerability Response' URL.

Red Hat Product Security is aware of this issue. Updates will be released as they become available. For additional information, please refer to the 'Vulnerability Response' URL.

Additional information

  • Bugzilla 1646784: hardware: Microarchitectural Fill Buffer Data Sampling (MFBDS)
  • CWE-203->CWE-385->CWE-226: Observable Discrepancy leads to Covert Timing Channel leads to Sensitive Information in Resource Not Removed Before Reuse
  • FAQ: Frequently asked questions about CVE-2018-12130

Common Vulnerability Scoring System (CVSS) Score Details

Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).

CVSS v3 Score Breakdown
Red HatNVD

CVSS v3 Base Score

6.2

5.6

Attack Vector

Local

Local

Attack Complexity

Low

High

Privileges Required

None

Low

User Interaction

None

None

Scope

Unchanged

Changed

Confidentiality Impact

High

High

Integrity Impact

None

None

Availability Impact

None

None

CVSS v3 Vector

Red Hat: CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

NVD: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

Frequently Asked Questions

Why is Red Hat's CVSS v3 score or Impact different from other vendors?

My product is listed as "Under investigation" or "Affected", when will Red Hat release a fix for this vulnerability?

What can I do if my product is listed as "Will not fix"?

What can I do if my product is listed as "Fix deferred"?

What is a mitigation?

I have a Red Hat product but it is not in the above list, is it affected?

Why is my security scanner reporting my product as vulnerable to this vulnerability even though my product version is fixed or not affected?

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