{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31616",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-31616"
  ],
  "published": "2026-04-24T14:43:40Z",
  "summary": "usb: gadget: f_phonet: fix skb frags[] overflow in pn_rx_complete()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_phonet: fix skb frags[] overflow in pn_rx_complete()\n\nA broken/bored/mean USB host can overflow the skb_shared_info->frags[]\narray on a Linux gadget exposing a Phonet function by sending an\nunbounded sequence of full-page OUT transfers.\n\npn_rx_complete() finalizes the skb only when req->actual < req->length,\nwhere req->length is set to PAGE_SIZE by the gadget.  If the host always\nsends exactly PAGE_SIZE bytes per transfer, fp->rx.skb will never be\nreset and each completion will add another fragment via\nskb_add_rx_frag().  Once nr_frags exceeds MAX_SKB_FRAGS (default 17),\nsubsequent frag stores overwrite memory adjacent to the shinfo on the\nheap.\n\nDrop the skb and account a length error when the frag limit is reached,\nmatching the fix applied in t7xx by commit f0813bcd2d9d (\"net: wwan:\nt7xx: fix potential skb->frags overflow in RX path\").",
  "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": "6.1.175",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31616"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3d7f7e0c842242878c24b2facff8d6eda23ee1e9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b5ec49fa198bd08967a3102bd41f53ccadce72c9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7424f0287da73d3d8c5fa5e9d25d26fce762708e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9ceff1251904901b0b4e5fe6350fcaffa368ce83"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c9315ce9da3632c591666a29de82d3e92d46bec1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4e476c25bfcab0535ba7c76a903ae77ca8747711"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bd44ce09b9b569f49ed13e2d87d23d853fc7d6a7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/66f7471c4042e4eb300e30b5b9d87d1406862673"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c088d5dd2fffb4de1fb8e7f57751c8b82942180a"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-06-15T02:03:26Z"
  }
}