CVE-2026-98927

--- CME Mitigation Guidance (2026-11-02) ---
Disclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure.

The highest-value action is to prevent dynamic reallocation of the nested_mmus shadow page table array by allocating it as a fixed-size pointer array at VM creation: upgrade to the fixed Kernel/Kernel Ivos Qualcomm/Openshift/Ose Rhel Coreos/Kpatch builds, which pre-allocate nested_mmus as a fixed-size array of pointers during VM creation and allocate per-vCPU MMU structures individually without reallocation, closing all 2 injection vectors (concurrent vCPU initialization during L2 guest execution, dynamic reallocation of the nested_mmus array). Until patched, this is only a concern on Linux ARM64 hosts with KVM nested virtualization enabled — Non-ARM64 platforms and systems operating standard, non-nested virtual machines are unaffected — so Disable nested virtualization or prevent untrusted guests from executing L2 workloads while concurrently initializing vCPUs. As a compensating measure, Enable runtime memory error detection such as KASAN or HWASan to detect use-after-free access when an active vCPU references deallocated shadow page table structures and Enable SLAB freelist hardening with randomization and integrity validation to impede kernel heap exploitation of freed nested_mmus memory. These controls limit blast radius and contain exploitation, but they do not fix the underlying lifecycle use-after-free defect — apply the upstream patch to fully remediate.

Highest-impact CME: CME-1005 Runtime Memory Error Detection (KASAN/HWASan) (medium)