{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-68279",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-68279"
  ],
  "published": "2026-08-10T12:08:00Z",
  "summary": "drm/dp/mst: fix OOB reads in remote DPCD/I2C sideband reply parsers",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/dp/mst: fix OOB reads in remote DPCD/I2C sideband reply parsers\n\ndrm_dp_sideband_parse_remote_dpcd_read() reads num_bytes from the raw\nmessage and then unconditionally does:\n\n  memcpy(bytes, &raw->msg[idx], num_bytes);\n\nwithout checking that idx + num_bytes <= raw->curlen. raw->msg[] is\n256 bytes; if a malicious or misbehaving MST hub sets num_bytes larger\nthan the remaining payload, the memcpy reads past the received data\ninto whatever follows in raw->msg[].\n\ndrm_dp_sideband_parse_remote_i2c_read_ack() has the same flaw (noted\nwith a /* TODO check */ comment since the code was introduced).\n\nFix both functions by using a single combined check\n(idx + num_bytes > curlen) before each memcpy. Since num_bytes is u8,\nit is always >= 0, so this strictly subsumes the simpler idx > curlen\nform and no separate step is needed.\n\n[added missing fixes tag]",
  "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": "6.1.183",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-68279"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/185de1d74e658e2edb723ba76fa61903f77d8a68"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d7b9b1e33b4ed8c48d4db6e6e21c257ebbbb2586"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c2fbda0fe0163c55ba3820ee6cea0c6b43622eda"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/22d9f7fc1aaabaf73d5f30e8b0c9aa814ecd6ed2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/04d953f50d61e542e94a5977822cc53735f8c0ce"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/533d9e2bede4aeefdc2a0561d7071cfede95958f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e6ef5455b06cb4e5d181aabcd723791587c79f12"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1a8f537f5a1eeac941f262fe73078d6b08ba83c0"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-23T12:46:35Z"
  }
}