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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


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


Affected Products:

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


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)


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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