CVE-2022-23824

A flaw was found in hw. The AMD CPUs can be attacked similar to the previously known Spectre Variant 2 (CVE-2017-5715). This issue affects AMD CPUs where the OS relies on IBPB to flush the return address predictor. As a result, an unprivileged attacker could use this flaw to cross the syscall and guest/host boundaries and read privileged memory by conducting targeted cache side-channel attacks.

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.

Please see the vulnerability response article for the full list of updates available and a detailed discussion of this issue, which compares the existing mitigation for CVE-2022-23816 and CVE-2022-29900, mentioning Mitigation V2-3 of Software Techniques for Managing Speculation.pdf, and a suggests that Hypervisor and OS vendors review their usages of IBPB.