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CVE-2024-53135 affects Intel Processor Trace (Intel PT) virtualization in the Linux kernel's KVM VMX guest/host mode, controlled by the pt_mode module parameter. KVM fails to ensure that tracing is disabled and remains disabled before VM entry, violating hardware consistency requirements when loading the guest's IA32_RTIT_CTL register and potentially causing fatal guest failures. KVM also uses unvalidated guest CPUID configuration supplied by userspace to determine which model-specific registers to pass through, save, and load. Advertising more Intel PT address ranges than the hardware supports can cause accesses to nonexistent registers, producing host warnings, ToPA errors, and a potential deadlock. The fix disables this virtualization mode unless CONFIG_BROKEN is enabled.
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A Linux kernel KVM/VMX vulnerability in Intel Processor Trace virtualization can cause guest failures and host availability problems. KVM fails to ensure tracing remains disabled before VM entry and uses unvalidated guest CPUID settings to determine which MSRs to save and load. The reference assigns CVSS v3 severity 6.5 and recommends updating affected Google Container-Optimized OS kernel packages to version 18613.75.89 or later. The kernel fix disables the problematic guest/host virtualization mode unless CONFIG_BROKEN is enabled.
Linux kernel KVM VMX Intel PT virtualization issue.
A Linux kernel KVM/VMX flaw involving Intel Processor Trace virtualization in guest/host mode. Faulty handling of tracing state and guest CPUID-derived MSR configuration can crash guests and cause host warnings, errors, potential deadlock, and availability/stability impact.
Linux kernel KVM Intel Processor Trace virtualization flaw.
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