drm/dp_mst: Ensure mst_primary pointer is valid in drm_dp_mst_handle_up_req()

{
  "id": "17e46fdcb5e1b8c47ff53b1558c0b01a6504cf53c36758bcafc514d0cf5cfbb0",
  "url": "https://osv.dev/vulnerability/CVE-2024-57798",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/dp_mst: Ensure mst_primary pointer is valid in drm_dp_mst_handle_up_req()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm/dp_mst: Ensure mst_primary pointer is valid in drm_dp_mst_handle_up_req() While receiving an MST up request message from one thread in drm_dp_mst_handle_up_req(), the MST topology could be removed from another thread via drm_dp_mst_topology_mgr_set_mst(false), freeing mst_primary and setting drm_dp_mst_topology_mgr::mst_primary to NULL. This could lead to a NULL deref/use-after-free of mst_primary in drm_dp_mst_handle_up_req(). Avoid the above by holding a reference for mst_primary in drm_dp_mst_handle_up_req() while it's used. v2: Fix kfreeing the request if getting an mst_primary reference fails.",
    "evidence": "osv:CVE-2024-57798",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.123",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.69",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.8",
            "evidence": "/affected/1/ranges"
          }
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        "affected_versions": []
      }
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    "severity": "high",
    "structured": {
      "id": "CVE-2024-57798",
      "aliases": [
        "CVE-2024-57798"
      ],
      "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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          "ranges": [
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              "type": "ECOSYSTEM",
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            "name": "Kernel",
            "ecosystem": "Linux"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-57798.json"
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      ],
      "modified": "2026-10-28T02:30:45.821317814Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/9735d40f5fde9970aa46e828ecc85c32571d58a2",
        "https://git.kernel.org/stable/c/ce55818b2d3a999f886af91679589e4644ff1dc8",
        "https://git.kernel.org/stable/c/e54b00086f7473dbda1a7d6fc47720ced157c6a8",
        "https://git.kernel.org/stable/c/f61b2e5e7821f868d6afc22382a66a30ee780ba0",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/57xxx/CVE-2024-57798.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-57798",
        "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/2024/57xxx/CVE-2024-57798.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-57798",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 513535,
  "published_at": "2025-01-11T12:39:48.212+00:00"
}