CVE-2026-98433

/// Technical description

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

KVM: PPC: Book3S HV: fix secure device page leak on uv_page_in() failure

In kvmppc_svm_page_in(), if uv_page_in() fails after

kvmppc_uvmem_get_page() has succeeded, the secure device page is never

released. kvmppc_uvmem_get_page() sets a bit in kvmppc_uvmem_bitmap,

allocates a kvmppc_uvmem_page_pvt struct, marks the GFN as

KVMPPC_GFN_UVMEM_PFN, and calls zone_device_page_init() which sets

refcount=1 and locks the page. The subsequent goto out_finalize skips

the *mig.dst assignment, so migrate_vma_finalize() is a no-op for the

page, and none of those resources are ever reclaimed.

Each occurrence permanently consumes one entry from the firmware-bounded

secure memory pool (kvmppc_uvmem_bitmap), leaks pvt, and leaves the GFN

marked as secure — making it unusable for the lifetime of the VM.

The twin __kvmppc_svm_page_out() already handles the analogous uv_page_out()

failure correctly with unlock_page(dpage); __free_pa

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

/// References