drm/dp_mst: Fix MST sideband message body length check

{
  "id": "31528b452543c6cc5d71cf153c04e2c1398212c1d2ed1bf8e489f61a2b06f3ba",
  "url": "https://osv.dev/vulnerability/CVE-2024-56616",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/dp_mst: Fix MST sideband message body length check",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm/dp_mst: Fix MST sideband message body length check Fix the MST sideband message body length check, which must be at least 1 byte accounting for the message body CRC (aka message data CRC) at the end of the message. This fixes a case where an MST branch device returns a header with a correct header CRC (indicating a correctly received body length), with the body length being incorrectly set to 0. This will later lead to a memory corruption in drm_dp_sideband_append_payload() and the following errors in dmesg: UBSAN: array-index-out-of-bounds in drivers/gpu/drm/display/drm_dp_mst_topology.c:786:25 index -1 is out of range for type 'u8 [48]' Call Trace: drm_dp_sideband_append_payload+0x33d/0x350 [drm_display_helper] drm_dp_get_one_sb_msg+0x3ce/0x5f0 [drm_display_helper] drm_dp_mst_hpd_irq_handle_event+0xc8/0x1580 [drm_display_helper] memcpy: detected field-spanning write (size 18446744073709551615) of single field \"&msg->msg[msg->curlen]\" at drivers/gpu/drm/display/drm_dp_mst_topology.c:791 (size 256) Call Trace: drm_dp_sideband_append_payload+0x324/0x350 [drm_display_helper] drm_dp_get_one_sb_msg+0x3ce/0x5f0 [drm_display_helper] drm_dp_mst_hpd_irq_handle_event+0xc8/0x1580 [drm_display_helper]",
    "evidence": "osv:CVE-2024-56616",
    "products": [
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          "value": "Kernel",
          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
        "fixed_versions": [
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            "value": "5.10.233",
            "evidence": "/affected/1/ranges"
          },
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            "value": "5.15.176",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.1.120",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.66",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.5",
            "evidence": "/affected/1/ranges"
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    "severity": "unknown",
    "structured": {
      "id": "CVE-2024-56616",
      "aliases": [
        "CVE-2024-56616"
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      "modified": "2026-10-28T02:30:38.040976761Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/109f91d8b9335b0f3714ef9920eae5a8b21d56af",
        "https://git.kernel.org/stable/c/1fc1f32c4a3421b9d803f18ec3ef49db2fb5d5ef",
        "https://git.kernel.org/stable/c/70e7166612f4e6da8d7d0305c47c465d88d037e5",
        "https://git.kernel.org/stable/c/780fa184d4dc38ad6c4fded345ab8f9be7a63e96",
        "https://git.kernel.org/stable/c/bd2fccac61b40eaf08d9546acc9fef958bfe4763",
        "https://git.kernel.org/stable/c/c58947a8d4a500902597ee1dbadf0518d7ff8801",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56616.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-56616",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
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        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56616.json"
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        "value": "CVE-2024-56616",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
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  "source_id": "core-osv",
  "document_id": 505030,
  "published_at": "2024-12-27T14:51:21.009+00:00"
}