CVE-2021-0127
microcode: Intel Processor Breakpoint Control Flow
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · February 8, 2022
Updated · November 21, 2025
Description
A flaw was found in microcode. Under complex microarchitectural conditions, an unexpected code breakpoint may cause a system hang. The hang was observed on a Skylake server processor, and subsequent analysis indicated additional potentially affected processors. This flaw allows a possible temporary denial of service (TDOS) to occur.
Statement
Red Hat has very limited to no visibility and control over binary blobs provided by third-party vendors. Red Hat relies heavily on the vendors to provide timely updates and information about included changes for this content. In most cases, it merely acts as a release vehicle between the third-party vendor and Red Hat customers with no possibility of influencing or even documenting the changes. Unless explicitly stated, the level of insight, oversight, and control Red Hat has does not meet the criteria required (in terms of Red Hat-owned development processes and QA documentation) for releasing this content as RHSA. For more information, please contact the binary content vendor.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.6CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
CWE not specified