drm/amdgpu: Fix init ordering in amdgpu_vram_mgr_init()

{
  "id": "e1e64f038a185ce712b13f80bcc532351b0960319b0b9e2ba46018c78bc6b724",
  "url": "https://osv.dev/vulnerability/CVE-2026-89828",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/amdgpu: Fix init ordering in amdgpu_vram_mgr_init()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: Fix init ordering in amdgpu_vram_mgr_init() drmm_cgroup_register_region() is called before INIT_LIST_HEAD() and gpu_buddy_init() in amdgpu_vram_mgr_init(). If it fails, the function returns early and bypasses those initializations. Since adev->mman.initialized is set to true before amdgpu_vram_mgr_init() is called, a failure triggers amdgpu_ttm_fini(), which calls amdgpu_vram_mgr_fini(), which then: - Calls list_for_each_entry_safe() on reservations_pending and reserved_pages, whose list_head::next pointers are zero-initialized (NULL). The loop does not recognize them as empty and dereferences NULL. - Calls gpu_buddy_fini(), which iterates free_trees[] unconditionally via for_each_free_tree(). Since mm->free_trees is NULL (never allocated), this dereferences NULL. Both result in a kernel panic on the module load error path. Fix by moving drmm_cgroup_register_region() to after the list and buddy allocator are fully initialized, so the teardown path is safe to run.",
    "evidence": "osv:CVE-2026-89828",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.51",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-89828",
      "aliases": [
        "CVE-2026-89828"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "2b624a2c18656ea32e0849e7bc0018ba3c97ca64"
                },
                {
                  "fixed": "e184e46ca1ba652ab8053a10a51b39aad06d3f5c"
                },
                {
                  "fixed": "3e234c6face8651045f46895dfe9c086ea64f03b"
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                {
                  "fixed": "e773798e14ac0aea54ca9676083b91f445e5bc59"
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              ]
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89828.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.14.0"
                },
                {
                  "fixed": "6.18.51"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
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                {
                  "fixed": "7.2.5"
                }
              ]
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89828.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.042132755Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3e234c6face8651045f46895dfe9c086ea64f03b",
        "https://git.kernel.org/stable/c/e184e46ca1ba652ab8053a10a51b39aad06d3f5c",
        "https://git.kernel.org/stable/c/e773798e14ac0aea54ca9676083b91f445e5bc59",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89828.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89828",
        "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-2026-89828.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89828",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 494882,
  "published_at": "2026-09-16T10:31:00.827+00:00"
}