---
id: CVE-2026-98433
title: 'KVM: PPC: Book3S HV: fix secure device page leak on uv_page_in() failure'
summary: |-
  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, th…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= ca9f4942670c37407bb109090eaf776ce2ccc54c <
    ed2f2ff63cb7e71204096e765c6d02c3b6974b95
  - >-
    Linux >= ca9f4942670c37407bb109090eaf776ce2ccc54c <
    8f3b7746874b39fc20e0363c9076c7787d4765ba
  - >-
    Linux >= ca9f4942670c37407bb109090eaf776ce2ccc54c <
    a933d7024359e2e566b07903d1294b84f90482ae
  - >-
    Linux >= ca9f4942670c37407bb109090eaf776ce2ccc54c <
    c41088b2765af1e97e7bb05f906ae1823eca0388
  - >-
    Linux >= ca9f4942670c37407bb109090eaf776ce2ccc54c <
    f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b
  - >-
    Linux >= ca9f4942670c37407bb109090eaf776ce2ccc54c <
    dfb84274932737e338ff5eb27f34b4c8ecb01b50
  - >-
    Linux >= ca9f4942670c37407bb109090eaf776ce2ccc54c <
    fcbff8008b0e08cd53b611bd0ff7e01f5b962f80
  - >-
    Linux >= ca9f4942670c37407bb109090eaf776ce2ccc54c <
    0a416ee20bcccddf91ca5b63696a23b9d11d73aa
  - Linux 5.5
published: '2026-10-18'
updated: '2026-10-18'
sourceUpdated: '2026-10-18T14:38:18.296Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98433'
references:
  - url: 'https://git.kernel.org/stable/c/ed2f2ff63cb7e71204096e765c6d02c3b6974b95'
  - url: 'https://git.kernel.org/stable/c/8f3b7746874b39fc20e0363c9076c7787d4765ba'
  - url: 'https://git.kernel.org/stable/c/a933d7024359e2e566b07903d1294b84f90482ae'
  - url: 'https://git.kernel.org/stable/c/c41088b2765af1e97e7bb05f906ae1823eca0388'
  - url: 'https://git.kernel.org/stable/c/f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b'
  - url: 'https://git.kernel.org/stable/c/dfb84274932737e338ff5eb27f34b4c8ecb01b50'
  - url: 'https://git.kernel.org/stable/c/fcbff8008b0e08cd53b611bd0ff7e01f5b962f80'
  - url: 'https://git.kernel.org/stable/c/0a416ee20bcccddf91ca5b63696a23b9d11d73aa'
tags:
  - cve.org
ingestedAt: '2026-10-18T15:45:12.310Z'
---

## Overview

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_page(dpage).  Apply
the same pattern here: unlock_page() followed by put_page(), which
chains through free_zone_device_folio() into kvmppc_uvmem_folio_free()
to clear the bitmap bit, free pvt, and reset the GFN state.

Reachable whenever uv_page_in() returns an error (e.g. UV pool
exhaustion) on any POWER9/10 + Ultravisor/PEF system.

## Affected

- `Linux >= ca9f4942670c37407bb109090eaf776ce2ccc54c < ed2f2ff63cb7e71204096e765c6d02c3b6974b95`
- `Linux >= ca9f4942670c37407bb109090eaf776ce2ccc54c < 8f3b7746874b39fc20e0363c9076c7787d4765ba`
- `Linux >= ca9f4942670c37407bb109090eaf776ce2ccc54c < a933d7024359e2e566b07903d1294b84f90482ae`
- `Linux >= ca9f4942670c37407bb109090eaf776ce2ccc54c < c41088b2765af1e97e7bb05f906ae1823eca0388`
- `Linux >= ca9f4942670c37407bb109090eaf776ce2ccc54c < f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b`
- `Linux >= ca9f4942670c37407bb109090eaf776ce2ccc54c < dfb84274932737e338ff5eb27f34b4c8ecb01b50`
- `Linux >= ca9f4942670c37407bb109090eaf776ce2ccc54c < fcbff8008b0e08cd53b611bd0ff7e01f5b962f80`
- `Linux >= ca9f4942670c37407bb109090eaf776ce2ccc54c < 0a416ee20bcccddf91ca5b63696a23b9d11d73aa`
- `Linux 5.5`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.