FKIE_CVE-2026-98433

Vulnerability from fkie_nvd - Published: 2026-10-18 15:16 - Updated: 2026-10-19 10:18
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0a416ee20bcccddf91ca5b63696a23b9d11d73aa
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8f3b7746874b39fc20e0363c9076c7787d4765ba
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a933d7024359e2e566b07903d1294b84f90482ae
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c41088b2765af1e97e7bb05f906ae1823eca0388
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dfb84274932737e338ff5eb27f34b4c8ecb01b50
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ed2f2ff63cb7e71204096e765c6d02c3b6974b95
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fcbff8008b0e08cd53b611bd0ff7e01f5b962f80
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/powerpc/kvm/book3s_hv_uvmem.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ed2f2ff63cb7e71204096e765c6d02c3b6974b95",
              "status": "affected",
              "version": "ca9f4942670c37407bb109090eaf776ce2ccc54c",
              "versionType": "git"
            },
            {
              "lessThan": "8f3b7746874b39fc20e0363c9076c7787d4765ba",
              "status": "affected",
              "version": "ca9f4942670c37407bb109090eaf776ce2ccc54c",
              "versionType": "git"
            },
            {
              "lessThan": "a933d7024359e2e566b07903d1294b84f90482ae",
              "status": "affected",
              "version": "ca9f4942670c37407bb109090eaf776ce2ccc54c",
              "versionType": "git"
            },
            {
              "lessThan": "c41088b2765af1e97e7bb05f906ae1823eca0388",
              "status": "affected",
              "version": "ca9f4942670c37407bb109090eaf776ce2ccc54c",
              "versionType": "git"
            },
            {
              "lessThan": "f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b",
              "status": "affected",
              "version": "ca9f4942670c37407bb109090eaf776ce2ccc54c",
              "versionType": "git"
            },
            {
              "lessThan": "dfb84274932737e338ff5eb27f34b4c8ecb01b50",
              "status": "affected",
              "version": "ca9f4942670c37407bb109090eaf776ce2ccc54c",
              "versionType": "git"
            },
            {
              "lessThan": "fcbff8008b0e08cd53b611bd0ff7e01f5b962f80",
              "status": "affected",
              "version": "ca9f4942670c37407bb109090eaf776ce2ccc54c",
              "versionType": "git"
            },
            {
              "lessThan": "0a416ee20bcccddf91ca5b63696a23b9d11d73aa",
              "status": "affected",
              "version": "ca9f4942670c37407bb109090eaf776ce2ccc54c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/powerpc/kvm/book3s_hv_uvmem.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.5"
            },
            {
              "lessThan": "5.5",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: PPC: Book3S HV: fix secure device page leak on uv_page_in() failure\n\nIn kvmppc_svm_page_in(), if uv_page_in() fails after\nkvmppc_uvmem_get_page() has succeeded, the secure device page is never\nreleased.  kvmppc_uvmem_get_page() sets a bit in kvmppc_uvmem_bitmap,\nallocates a kvmppc_uvmem_page_pvt struct, marks the GFN as\nKVMPPC_GFN_UVMEM_PFN, and calls zone_device_page_init() which sets\nrefcount=1 and locks the page.  The subsequent goto out_finalize skips\nthe *mig.dst assignment, so migrate_vma_finalize() is a no-op for the\npage, and none of those resources are ever reclaimed.\n\nEach occurrence permanently consumes one entry from the firmware-bounded\nsecure memory pool (kvmppc_uvmem_bitmap), leaks pvt, and leaves the GFN\nmarked as secure \u2014 making it unusable for the lifetime of the VM.\n\nThe twin __kvmppc_svm_page_out() already handles the analogous uv_page_out()\nfailure correctly with unlock_page(dpage); __free_page(dpage).  Apply\nthe same pattern here: unlock_page() followed by put_page(), which\nchains through free_zone_device_folio() into kvmppc_uvmem_folio_free()\nto clear the bitmap bit, free pvt, and reset the GFN state.\n\nReachable whenever uv_page_in() returns an error (e.g. UV pool\nexhaustion) on any POWER9/10 + Ultravisor/PEF system."
    }
  ],
  "id": "CVE-2026-98433",
  "lastModified": "2026-10-19T10:18:51.290",
  "metrics": {},
  "published": "2026-10-18T15:16:53.047",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0a416ee20bcccddf91ca5b63696a23b9d11d73aa"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8f3b7746874b39fc20e0363c9076c7787d4765ba"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a933d7024359e2e566b07903d1294b84f90482ae"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c41088b2765af1e97e7bb05f906ae1823eca0388"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dfb84274932737e338ff5eb27f34b4c8ecb01b50"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ed2f2ff63cb7e71204096e765c6d02c3b6974b95"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f3d4b2fc30c97cf8e6f8b880d2de9c17ecac7f5b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fcbff8008b0e08cd53b611bd0ff7e01f5b962f80"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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