iommufd: Fix iopt_access_list_id overwrite bug

{
  "id": "b05274a719936a1640428b9dceb1e15a430a1c348dade7b9aee34d98dcb773e7",
  "url": "https://osv.dev/vulnerability/CVE-2024-26786",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "iommufd: Fix iopt_access_list_id overwrite bug",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: iommufd: Fix iopt_access_list_id overwrite bug Syzkaller reported the following WARN_ON: WARNING: CPU: 1 PID: 4738 at drivers/iommu/iommufd/io_pagetable.c:1360 Call Trace: iommufd_access_change_ioas+0x2fe/0x4e0 iommufd_access_destroy_object+0x50/0xb0 iommufd_object_remove+0x2a3/0x490 iommufd_object_destroy_user iommufd_access_destroy+0x71/0xb0 iommufd_test_staccess_release+0x89/0xd0 __fput+0x272/0xb50 __fput_sync+0x4b/0x60 __do_sys_close __se_sys_close __x64_sys_close+0x8b/0x110 do_syscall_x64 The mismatch between the access pointer in the list and the passed-in pointer is resulting from an overwrite of access->iopt_access_list_id, in iopt_add_access(). Called from iommufd_access_change_ioas() when xa_alloc() succeeds but iopt_calculate_iova_alignment() fails. Add a new_id in iopt_add_access() and only update iopt_access_list_id when returning successfully.",
    "evidence": "osv:CVE-2024-26786",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.21",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.7.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2024-26786",
      "aliases": [
        "CVE-2024-26786"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                {
                  "fixed": "f1fb745ee0a6fe43f1d84ec369c7e6af2310fda9"
                },
                {
                  "fixed": "9526a46cc0c378d381560279bea9aa34c84298a0"
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                {
                  "fixed": "aeb004c0cd6958e910123a1607634401009c9539"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26786.json"
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        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.6.0"
                },
                {
                  "fixed": "6.6.21"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.7.9"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26786.json"
          }
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      ],
      "modified": "2026-10-28T02:30:37.796053098Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/9526a46cc0c378d381560279bea9aa34c84298a0",
        "https://git.kernel.org/stable/c/aeb004c0cd6958e910123a1607634401009c9539",
        "https://git.kernel.org/stable/c/f1fb745ee0a6fe43f1d84ec369c7e6af2310fda9",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26786.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-26786",
        "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/2024/26xxx/CVE-2024-26786.json"
      }
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    "related_cves": [
      {
        "value": "CVE-2024-26786",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505048,
  "published_at": "2024-04-04T08:20:19.109+00:00"
}