CVE-2022-29900 Information

Description

AMD microprocessor families 15h to 18h are affected by a new Spectre variant that is able to bypass their retpoline mitigation in the kernel to leak arbitrary data. An attacker with unprivileged user access can hijack return instructions to achieve arbitrary speculative code execution under certain microarchitecture-dependent conditions.

Reference

http://xenbits.xen.org/xsa/advisory-407.html http://www.openwall.com/lists/oss-security/2022/07/12/2 https://comsec.ethz.ch/retbleed http://www.openwall.com/lists/oss-security/2022/07/12/5 http://www.openwall.com/lists/oss-security/2022/07/12/4 http://www.openwall.com/lists/oss-security/2022/07/13/1