{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-23227",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-23227"
  ],
  "published": "2026-02-18T14:54:17Z",
  "summary": "drm/exynos: vidi: use ctx->lock to protect struct vidi_context member variables related to memory alloc/free",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/exynos: vidi: use ctx->lock to protect struct vidi_context member variables related to memory alloc/free\n\nExynos Virtual Display driver performs memory alloc/free operations\nwithout lock protection, which easily causes concurrency problem.\n\nFor example, use-after-free can occur in race scenario like this:\n```\n\tCPU0\t\t\t\tCPU1\t\t\t\tCPU2\n\t----\t\t\t\t----\t\t\t\t----\n  vidi_connection_ioctl()\n    if (vidi->connection) // true\n      drm_edid = drm_edid_alloc(); // alloc drm_edid\n      ...\n      ctx->raw_edid = drm_edid;\n      ...\n\t\t\t\t\t\t\t\tdrm_mode_getconnector()\n\t\t\t\t\t\t\t\t  drm_helper_probe_single_connector_modes()\n\t\t\t\t\t\t\t\t    vidi_get_modes()\n\t\t\t\t\t\t\t\t      if (ctx->raw_edid) // true\n\t\t\t\t\t\t\t\t        drm_edid_dup(ctx->raw_edid);\n\t\t\t\t\t\t\t\t          if (!drm_edid) // false\n\t\t\t\t\t\t\t\t          ...\n\t\t\t\tvidi_connection_ioctl()\n\t\t\t\t  if (vidi->connection) // false\n\t\t\t\t    drm_edid_free(ctx->raw_edid); // free drm_edid\n\t\t\t\t    ...\n\t\t\t\t\t\t\t\t          drm_edid_alloc(drm_edid->edid)\n\t\t\t\t\t\t\t\t            kmemdup(edid); // UAF!!\n\t\t\t\t\t\t\t\t            ...\n```\n\nTo prevent these vulns, at least in vidi_context, member variables related\nto memory alloc/free should be protected with ctx->lock.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.167",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-23227"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/56966a4cfa925ec24edb68ab652a740a7abe2c4d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9e1ef9396a1899925911b1729cb65665420268df"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/92dd1f38d7db75374dcdaf54f1d79d67bffd54e5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1b24d3e8792bcc050c70e8e0dea6b49c4fc63b13"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/abfdf449fb3d7b42e85a1ad1c8694b768b1582f4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/60b75407c172e1f341a8a5097c5cbc97dbbdd893"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0cd2c155740dbd00868ac5a8ae5d14cd6b9ed385"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/52b330799e2d6f825ae2bb74662ec1b10eb954bb"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Requires local access to the DRM device node (/dev/dri/cardN) to issue the vidi_connection_ioctl and drm_mode_getconnector ioctls. Not reachable over network.\nAC:L - The attacker controls both sides of the race by issuing concurrent ioctls from multiple threads \u2014 one calling vidi_connection_ioctl to free raw_edid and another calling drm_mode_getconnector to read it.\nPR:L - The ioctl requires DRM_AUTH, which is granted to any process authenticated by the DRM master (display server). Any local user in a graphical session on an Exynos device has this access.\nUI:N - No victim action required; the attacker triggers the race entirely through their own concurrent ioctl calls.\nS:U - The vulnerability is in the kernel and impacts kernel memory; there is no crossing of a security boundary like VM escape or sandbox escape.\nC:H - The use-after-free allows reading freed memory via kmemdup on the reclaimed object, providing arbitrary memory read primitives when combined with heap spraying.\nI:H - The UAF enables heap spraying to reclaim the freed slot with attacker-controlled data, giving arbitrary write primitives and potential control flow hijacking for code execution.\nA:H - The use-after-free reliably causes kernel crashes (oops/panic) when the freed memory is accessed, providing a denial of service."
    }
  }
}