CVE-2022-0001: Intel Branch History Injection and Mitigation Evidence

Checked November 10, 2026. CVE-2022-0001 concerns non-transparent sharing of branch predictor selectors between contexts in some Intel processors. The Intel CNA record says an authorized user may enable information disclosure through local access. The issue is associated with Branch History Injection in Intel advisory INTEL-SA-00598.

That description does not establish an unauthenticated network attack, arbitrary code execution or a general virtual-machine escape. It also does not say every Intel processor is affected. Start with processor and platform identity, then follow the applicable vendor mitigation guidance.

Processor identity comes before the label

An x86-64 label identifies an architecture, not applicability of this Intel advisory. Product family, model, stepping, platform firmware and OS support can matter. A VM’s CPU presentation may be filtered by the hypervisor and cannot establish the physical host’s complete hardware or firmware state.

For a physical host, match supported inventory evidence to the vendor’s affected-product information. For a cloud VM, record provider, instance class and provider guidance alongside the guest state. Keep unverified host dependencies explicit.

Collect read-only Linux context

On a system you administer, these commands collect local context. They do not execute an exploit, change mitigation settings, or certify applicability.

uname -r
lscpu
cat /sys/devices/system/cpu/vulnerabilities/spectre_v2
journalctl -k -b --no-pager

The status file depends on the running kernel’s reporting interfaces. If absent, record the limitation rather than a safe result. Boot logs may supply microcode context; retain relevant sanitized lines instead of distributing complete system logs.

Use the running kernel and distribution documentation when interpreting the output. The Linux Spectre administration guide distinguishes attack variants and mitigations. A status line can contain several conditions; one reassuring fragment may conceal an unresolved requirement.

Join four evidence layers

This is an assessment framework, not a claim that every system needs identical updates. Select the correction from the responsible hardware, OS and virtualization vendors. Performance-driven mitigation changes need a separate accountable risk decision.

Prioritize the execution boundary

The local-access prerequisite makes workload trust relevant. A tightly controlled server differs operationally from a multi-tenant build platform accepting untrusted code. That distinction informs prioritization without changing the CVE’s description or establishing exploitation.

For VMware or another hypervisor, use applicable vendor guidance and host evidence. Match the specific ESXi build or other host platform to its advisory; a processor identifier alone cannot establish the state of a hypervisor. Hardware, hypervisor and guest questions need their respective owners.

Retain an interpretable closure record

Keep processor identity, physical or virtual context, vendor notice, microcode evidence, active kernel, complete relevant mitigation-status output, observation time and owner. If activation is pending, say so. If the provider owns a missing layer, retain confirmation or a tracked exception.

A second operator should understand why the asset was considered affected, corrected, not affected or unknown. A scanner label or isolated mitigation string cannot establish that conclusion by itself.

For assessments managed through the open-source AI pentest skills, attach these four evidence layers to the finding and remediation retest. A missing host confirmation should remain an explicit dependency in the report.