iommu: Fix dev_iommu memory leak when device_add fails in iommu_mock_device_add

{
  "id": "40f8c286b16d66d6ed24af78a8eb24bfa66115b1c4cdb2645f57ef40f361aede",
  "url": "https://osv.dev/vulnerability/CVE-2026-89449",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "iommu: Fix dev_iommu memory leak when device_add fails in iommu_mock_device_add",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: iommu: Fix dev_iommu memory leak when device_add fails in iommu_mock_device_add iommu_mock_device_add() first calls iommu_fwspec_init(), which on success allocates both dev->iommu (via dev_iommu_get()) and dev->iommu->fwspec. If the subsequent device_add(dev) call fails, the error path only calls iommu_fwspec_free(dev), which frees fwspec but leaves dev->iommu still allocated. This triggers the following kmemleak report when fuzzing with Syzkaller: BUG: memory leak unreferenced object 0xffff888011e0a200 (size 192): comm \"syz.1.1695\", pid 24885, jiffies 4295222527 hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 ad 4e ad de .............N.. ff ff ff ff 00 00 00 00 ff ff ff ff ff ff ff ff ................ backtrace (crc 25df5bb3): kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline] slab_post_alloc_hook mm/slub.c:4575 [inline] slab_alloc_node mm/slub.c:4899 [inline] __kmalloc_cache_noprof+0x47a/0x710 mm/slub.c:5415 kmalloc_noprof include/linux/slab.h:950 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] dev_iommu_get+0x10c/0x1a0 drivers/iommu/iommu.c:408 iommu_fwspec_init+0x288/0x4d0 drivers/iommu/iommu.c:3087 iommu_mock_device_add+0x46/0xb0 drivers/iommu/iommu.c:385 mock_dev_create drivers/iommu/iommufd/selftest.c:1025 [inline] iommufd_test_mock_domain drivers/iommu/iommufd/selftest.c:1066 [inline] iommufd_test+0x2f8a/0x6190 drivers/iommu/iommufd/selftest.c:2072 iommufd_fops_ioc",
    "evidence": "osv:CVE-2026-89449",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.50",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-89449",
      "aliases": [
        "CVE-2026-89449"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "2a918911ed3d0841923525ed0fe707762ee78844"
                },
                {
                  "fixed": "f80f3acb69164800051ecdee871b6b006cbc2e66"
                },
                {
                  "fixed": "eaf44262af24810d16800b988c92dfce90f73370"
                },
                {
                  "fixed": "b7b0b3851474883d4aba6ed72da87141204b23e5"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "6.17.3"
                },
                {
                  "fixed": "6.18"
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            },
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "1daf67217b0d0bf88ef7208d7fbeefe2378c6590"
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            }
          ],
          "versions": [
            "v6.17.13",
            "v6.17.12",
            "v6.17.11",
            "v6.17.10",
            "v6.17.9",
            "v6.17.8",
            "v6.17.7",
            "v6.17.6",
            "v6.17.5",
            "v6.17.4",
            "v6.17.3"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89449.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.18.0"
                },
                {
                  "fixed": "6.18.50"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89449.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.024048740Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/b7b0b3851474883d4aba6ed72da87141204b23e5",
        "https://git.kernel.org/stable/c/eaf44262af24810d16800b988c92dfce90f73370",
        "https://git.kernel.org/stable/c/f80f3acb69164800051ecdee871b6b006cbc2e66",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89449.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89449",
        "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/2026/89xxx/CVE-2026-89449.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89449",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 494871,
  "published_at": "2026-09-11T19:43:15.397+00:00"
}