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Linux Prepares New Spectre BHI Mitigation Option For Cloud Environments
For the Branch History Injection variant of Spectre (Spectre BHI) there is a patch pending to add a new mitigation option for that two year old CPU security vulnerability.
Spectre BHI/BHB can lead to leaking arbitrary kernel memory on modern Intel CPUs and was disclosed back in 2022 by VUSec. To avoid the performance costs of software mitigating the system calls, this new option is intended for cloud environments on older processors to just fend off VM-originated Spectre BHI attacks. This new Spectre BHI mitigation option can be found in TIP.git's x86/bugs branch ahead of the upcoming Linux 6.11 merge window.
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