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

{
  "id": "8bd95e3b29d3eb658b46b2453881483f4c0fe6d192e89709a4b145bc2fcd63f2",
  "url": "https://osv.dev/vulnerability/CVE-2026-98433",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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, 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.",
    "evidence": "osv:CVE-2026-98433",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.271",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.222",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.189",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.158",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.112",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.54",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.8",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98433",
      "aliases": [
        "CVE-2026-98433"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "ca9f4942670c37407bb109090eaf776ce2ccc54c"
                },
                {
                  "fixed": "ed2f2ff63cb7e71204096e765c6d02c3b6974b95"
                },
                {
                  "fixed": "8f3b7746874b39fc20e0363c9076c7787d4765ba"
                },
                {
                  "fixed": "a933d7024359e2e566b07903d1294b84f90482ae"
                },
                {
                  "fixed": "c41088b2765af1e97e7bb05f906ae1823eca0388"
                },
                {
                  "fixed": "f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b"
                },
                {
                  "fixed": "dfb84274932737e338ff5eb27f34b4c8ecb01b50"
                },
                {
                  "fixed": "fcbff8008b0e08cd53b611bd0ff7e01f5b962f80"
                },
                {
                  "fixed": "0a416ee20bcccddf91ca5b63696a23b9d11d73aa"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98433.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.5.0"
                },
                {
                  "fixed": "5.10.271"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.222"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.189"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.158"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.112"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.54"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.8"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98433.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.999605655Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0a416ee20bcccddf91ca5b63696a23b9d11d73aa",
        "https://git.kernel.org/stable/c/8f3b7746874b39fc20e0363c9076c7787d4765ba",
        "https://git.kernel.org/stable/c/a933d7024359e2e566b07903d1294b84f90482ae",
        "https://git.kernel.org/stable/c/c41088b2765af1e97e7bb05f906ae1823eca0388",
        "https://git.kernel.org/stable/c/dfb84274932737e338ff5eb27f34b4c8ecb01b50",
        "https://git.kernel.org/stable/c/ed2f2ff63cb7e71204096e765c6d02c3b6974b95",
        "https://git.kernel.org/stable/c/f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b",
        "https://git.kernel.org/stable/c/fcbff8008b0e08cd53b611bd0ff7e01f5b962f80",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98433.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98433",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98433.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98433",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 518560,
  "published_at": "2026-10-18T14:38:18.296+00:00"
}