CVE-2026-46147

Technical Description

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

KVM: arm64: Fix pin leak and publication ordering in __pkvm_init_vcpu()

Two bugs exist in the vCPU initialisation path:

1. If a check fails after hyp_pin_shared_mem() succeeds, the cleanup

path jumps to 'unlock' without calling unpin_host_vcpu() or

unpin_host_sve_state(), permanently leaking pin references on the

host vCPU and SVE state pages.

Extract a register_hyp_vcpu() helper that performs the checks and

the store. When register_hyp_vcpu() returns an error, call

unpin_host_vcpu() and unpin_host_sve_state() inline before falling

through to the existing 'unlock' label.

2. register_hyp_vcpu() publishes the new vCPU pointer into

'hyp_vm->vcpus[]' with a bare store, allowing a concurrent caller

of pkvm_load_hyp_vcpu() to observe a partially initialised vCPU

object.

Ensure the store uses smp_store_release() and the load uses

smp_load_acquire(). While 'vm_table_lock' currently ser

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References