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Intel® Processors RRSBA Advisory

Intel ID: INTEL-SA-00707
Advisory Category: Hardware
Impact of vulnerability: Information Disclosure
Severity rating: MEDIUM
Original release: 07/12/2022
Last revised: 07/12/2022

Summary: 

A potential security vulnerability in some Intel® Processors may allow information disclosure.  Intel is releasing prescriptive guidance to address this potential vulnerability.

Vulnerability Details:

CVEID:  CVE-2022-28693

Description: Unprotected alternative channel of return branch target prediction in some Intel(R) Processors may allow an authorized user to potentially enable information disclosure via local access.

CVSS Base Score:  4.7 Medium

CVSS Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected Products:

Some Intel® Processors, consult this list of affected products here.

Recommendations:

Intel recommends that affected Intel® Processors use enhanced Indirect Branch Restricted
Speculation (eIBRS) to address this potential vulnerability even if ‘retpoline’ mitigation is deployed.
Intel is releasing a technical paper to describe the RRSBA (Restricted RSB Alternate)
recommendation.

Acknowledgements:

Intel would like to thank Johannes Wikner and Kaveh Razavi from the COMSEC group at ETH Zurich for reporting this issue.

Intel, and nearly the entire technology industry, follows a disclosure practice called Coordinated Disclosure, under which a cybersecurity vulnerability is generally publicly disclosed only after mitigations are available.

Revision History

Revision Date Description
1.0 07/12/2022 Initial Release

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