CVE-2026-98863

In the Linux kernel, the following vulnerability has been resolved:

KVM: x86: Re-pend GET_NESTED_STATE_PAGES if getting said pages fails

Re-pend GET_NESTED_STATE_PAGES before exiting to userspace if getting the

nested pages fails in the KVM_RUN path. If userspace re-runs the vCPU, and

vmcs02 holds valid PFNs from the *previous* run of L2, then KVM could

re-enter L2 with stale, unpinned PFNs mapped into e.g. the vAPIC page.

Note, both SVM and VMX (as of commit 11722439fb20 ("KVM: nVMX: Ensure

KVM_REQ_GET_NESTED_STATE_PAGES is cleared on VM-Exit") ensure the request

is cleared on VM-Exit (including the "forced" case), i.e. there is no risk

of double-mapping due to emulated VMLAUNCH/VMRESUME/VMRUN *and* the request

trying to map the nested pages.