CVE-2026-98002 (GCVE-0-2026-98002)

Vulnerability from cvelistv5 – Published: 2026-09-25 10:23 – Updated: 2026-09-25 14:41
VLAI
Title
iommu/amd: Fix ineffective error check in nested domain allocation
Summary
In the Linux kernel, the following vulnerability has been resolved: iommu/amd: Fix ineffective error check in nested domain allocation amd_iommu_pdom_id_alloc() returns an int: a domain ID on success, or the negative errno from ida_alloc_range() when the ID space is exhausted or memory is short. amd_iommu_alloc_domain_nested() stores that return value in gdom_info->hdom_id, which is a u32, and only then tests it: gdom_info->hdom_id = amd_iommu_pdom_id_alloc(); if (gdom_info->hdom_id <= 0) { The assignment discards the sign, so -ENOSPC becomes 0xffffffe4 and the test never fires. The nested domain is then set up with a host domain ID that was never allocated, instead of the allocation failing with -ENOSPC. Keep the value in an int, test it there, and store it only once it is known to be valid, which is what the other amd_iommu_pdom_id_alloc() callers already do.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 757d2b1fdf5b7d6eead5963a49b5780617987ab8 , < 80c231f5577229d1e90a1e312b3095f9502f8625 (git)
Affected: 757d2b1fdf5b7d6eead5963a49b5780617987ab8 , < fa5c0827f0b7bac6d0a188f10118151769ae68fd (git)
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Linux Linux Affected: 7.0
Unaffected: 0 , < 7.0 (semver)
Unaffected: 7.2.7 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc3 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/iommu/amd/nested.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd: Fix ineffective error check in nested domain allocation\n\namd_iommu_pdom_id_alloc() returns an int: a domain ID on success, or the\nnegative errno from ida_alloc_range() when the ID space is exhausted or\nmemory is short.  amd_iommu_alloc_domain_nested() stores that return value\nin gdom_info-\u003ehdom_id, which is a u32, and only then tests it:\n\n\tgdom_info-\u003ehdom_id = amd_iommu_pdom_id_alloc();\n\tif (gdom_info-\u003ehdom_id \u003c= 0) {\n\nThe assignment discards the sign, so -ENOSPC becomes 0xffffffe4 and the\ntest never fires.  The nested domain is then set up with a host domain ID\nthat was never allocated, instead of the allocation failing with -ENOSPC.\n\nKeep the value in an int, test it there, and store it only once it is\nknown to be valid, which is what the other amd_iommu_pdom_id_alloc()\ncallers already do."
        }
      ],
      "metrics": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
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              "value": "AV:L - The patched function amd_iommu_alloc_domain_nested() is reached only via the IOMMU_HWPT_ALLOC ioctl on a local iommufd fd (/dev/iommu) against an AMD vIOMMU (iommufd_hwpt_alloc -\u003e viommu-\u003eops-\u003ealloc_domain_nested); no remote protocol carries the input.\nAC:H - The failure path needs ida_alloc_range() in amd_iommu_pdom_id_alloc() to fail: either all 65535 global host domain IDs are in use with a victim domain holding 0xffe4, which lowest-first allocation doesn\u0027t let the attacker arrange on demand, or a GFP_ATOMIC failure the attacker cannot force.\nPR:L - Needs a VMM-style user that has been given /dev/iommu (0660) and a bound VFIO device cdev to create a vIOMMU and nested HWPTs; that is delegated device access, not full init-namespace root.\nUI:N - The attacker allocates the nested HWPTs and attaches the device themselves; nobody else has to do anything.\nS:C - The unallocated hdom_id (truncated to 0xffe4/0xfff4 by DTE_DOMID_MASK) is written into the DTE by set_dte_nested(), so the nested device shares IOTLB tags with another IOMMU domain, breaking the DMA isolation boundary between domains.\nC:H - Because the DomID is aliased, the device\u0027s DMA can hit IOTLB translations cached for the other domain and read memory belonging to that domain.\nI:H - The same aliased IOTLB entries let the device\u0027s DMA writes land in the other domain\u0027s pages, corrupting memory outside the nested domain.\nA:H - Stray DMA writes into another domain\u0027s memory, plus invalidations for the parent S2 hitting the shared hdom_id, can corrupt host or guest memory used by other devices and bring them down."
            }
          ]
        }
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      "providerMetadata": {
        "dateUpdated": "2026-09-25T14:41:49.625Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/80c231f5577229d1e90a1e312b3095f9502f8625"
        },
        {
          "url": "https://git.kernel.org/stable/c/fa5c0827f0b7bac6d0a188f10118151769ae68fd"
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    "cveId": "CVE-2026-98002",
    "datePublished": "2026-09-25T10:23:29.929Z",
    "dateReserved": "2026-09-25T10:19:56.068Z",
    "dateUpdated": "2026-09-25T14:41:49.625Z",
    "state": "PUBLISHED"
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd: Fix ineffective error check in nested domain allocation\n\namd_iommu_pdom_id_alloc() returns an int: a domain ID on success, or the\nnegative errno from ida_alloc_range() when the ID space is exhausted or\nmemory is short.  amd_iommu_alloc_domain_nested() stores that return value\nin gdom_info-\u003ehdom_id, which is a u32, and only then tests it:\n\n\tgdom_info-\u003ehdom_id = amd_iommu_pdom_id_alloc();\n\tif (gdom_info-\u003ehdom_id \u003c= 0) {\n\nThe assignment discards the sign, so -ENOSPC becomes 0xffffffe4 and the\ntest never fires.  The nested domain is then set up with a host domain ID\nthat was never allocated, instead of the allocation failing with -ENOSPC.\n\nKeep the value in an int, test it there, and store it only once it is\nknown to be valid, which is what the other amd_iommu_pdom_id_alloc()\ncallers already do."
          }
        ],
        "id": "CVE-2026-98002",
        "lastModified": "2026-09-25T15:18:03.580",
        "metrics": {
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                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-09-25T11:17:28.430",
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        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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