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Security Vulnerability: Register File Data Sampling (RFDS) aka CVE-2023-28746

This document (000021404) is provided subject to the disclaimer at the end of this document.


For a comprehensive list of affected products please review the SUSE Security announcement .


Security researchers have identified yet another CPU transient execution information leak, allowing information extracted from various register filesets, like floating point registers, vector registers and integer registers.

This vulnerability only affects Intel Atom processors (aka XEON E cores).


Please install the update that contains the respective fix for this issue.
To retrieve the specific patch name, please use:
zypper lp -a --cve=CVE-2023-28746

and then use

zypper in -t patch <name_of_patch>

to apply the patch.


Security Alert

Additional Information

The following options influence the mitigation:

- reg_file_data_sampling=on

  If the CPU is vulnerable and fixed microcode is available, enables the mitigation.
- reg_file_data_sampling=off

  Disables the mitigation.

This flag is also set by the generic "mitigations" option.


A new reporting file was added:


This file can have following contents:

- Not affected

  The CPU is not affected by the problem.

- Vulnerable

  The CPU is vulnerable, but no mitigation is enabled.

- Vulnerable: No microcode

  The CPU is vulnerable, but the CPU microcode is not updated.

- Mitigation: Clear Register File

  The CPU is vulnerable and the CPU buffer clearing mitigation is enabled.

SUSE Security announcement:


This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:000021404
  • Creation Date: 14-Mar-2024
  • Modified Date:14-Mar-2024

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