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CVE-2026-89828

Estado: RecibidaSin puntuar—

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:

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.

Detalles técnicos trazas, registros y código del informe original
 - 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.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-89828",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2b624a2c18656ea32e0849e7bc0018ba3c97ca64",
              "lessThan": "e184e46ca1ba652ab8053a10a51b39aad06d3f5c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2b624a2c18656ea32e0849e7bc0018ba3c97ca64",
              "lessThan": "3e234c6face8651045f46895dfe9c086ea64f03b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2b624a2c18656ea32e0849e7bc0018ba3c97ca64",
              "lessThan": "e773798e14ac0aea54ca9676083b91f445e5bc59",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.14",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-16T11:16:49.493",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/3e234c6face8651045f46895dfe9c086ea64f03b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e184e46ca1ba652ab8053a10a51b39aad06d3f5c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e773798e14ac0aea54ca9676083b91f445e5bc59",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: Fix init ordering in amdgpu_vram_mgr_init()\n\ndrmm_cgroup_register_region() is called before INIT_LIST_HEAD() and\ngpu_buddy_init() in amdgpu_vram_mgr_init(). If it fails, the function\nreturns early and bypasses those initializations.\n\nSince adev->mman.initialized is set to true before amdgpu_vram_mgr_init()\nis called, a failure triggers amdgpu_ttm_fini(), which calls\namdgpu_vram_mgr_fini(), which then:\n\n - Calls list_for_each_entry_safe() on reservations_pending and\n   reserved_pages, whose list_head::next pointers are zero-initialized\n   (NULL). The loop does not recognize them as empty and dereferences NULL.\n\n - Calls gpu_buddy_fini(), which iterates free_trees[] unconditionally\n   via for_each_free_tree(). Since mm->free_trees is NULL\n   (never allocated), this dereferences NULL.\n\nBoth result in a kernel panic on the module load error path.\n\nFix by moving drmm_cgroup_register_region() to after the list and buddy\nallocator are fully initialized, so the teardown path is safe to run."
    }
  ],
  "lastModified": "2026-09-16T11:16:49.493",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}