{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64270",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-64270"
  ],
  "published": "2026-07-25T08:51:45Z",
  "summary": "Input: mms114 - reject an oversized device packet size",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: mms114 - reject an oversized device packet size\n\nmms114_interrupt() reads a packet of touch data from the device into a\nfixed-size on-stack buffer\n\n\tstruct mms114_touch touch[MMS114_MAX_TOUCH];\n\nwhich holds MMS114_MAX_TOUCH (10) events of MMS114_EVENT_SIZE (8) bytes,\ni.e. 80 bytes. The length of the I2C read into it is taken verbatim from\nthe device:\n\n\tpacket_size = mms114_read_reg(data, MMS114_PACKET_SIZE);\n\tif (packet_size <= 0)\n\t\tgoto out;\n\t...\n\terror = __mms114_read_reg(data, MMS114_INFORMATION, packet_size,\n\t\t\t(u8 *)touch);\n\npacket_size is a single device register byte (0x0F) and the only check\nis the lower bound packet_size <= 0; it is never bounded against the\nsize of touch[]. A malfunctioning, malicious or counterfeit controller\n(or an attacker tampering with the I2C bus) can report a packet_size of\nup to 255, so __mms114_read_reg() writes up to 175 bytes past the end of\ntouch[] on the IRQ-thread stack: a stack out-of-bounds write that can\noverwrite the stack canary, saved registers and the return address.\n\nA well-formed device never reports more than the buffer holds, so reject\nan oversized packet and drop the report, consistent with the handler's\nother error paths, rather than reading past the buffer.",
  "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": "6.1.184",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64270"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/040843281eebfa110d08fd7fb083fe6cb55cea14"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/39b12daf1adb80f9595fdfe584961deb80860cbb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d99ba93c35ff2d5276e9c2632967481bd53a79d0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5d2ea15ba03bf17ed143ff1a0995a4206edc3fb6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b78150729762d47c14fe29a2582bdca5568e62b8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8301c335305344d4da4ab9442b6a399dacfe5b8d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f3d5e77b27fded71dcb97f409262bf0abba0410e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/66725039f7090afe14c31bd259e2059a68f04023"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-23T12:46:35Z"
  }
}