SB2022031310 - Spectre-BHB vulnerability in ARM processors

Description

This security bulletin contains information about 1 security vulnerability.

1) Processor optimization removal or modification of security-critical code (CVE-ID: CVE-2022-23960)

The vulnerability allows a local user to obtain potentially sensitive information.

The vulnerability exists due to improper restrictions of cache speculation. A local user can leverage the shared branch history in the Branch History Buffer (BHB) to influence mispredicted branches and gain access to sensitive information.

The vulnerability was dubbed Spectre-BHB.

Remediation

Install update from vendor's website.

References

• https://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability
• https://developer.arm.com/support/arm-security-updates
• http://www.openwall.com/lists/oss-security/2022/03/18/2