{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38574",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-38574"
  ],
  "published": "2025-08-19T17:19:12Z",
  "summary": "pptp: ensure minimal skb length in pptp_xmit()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\npptp: ensure minimal skb length in pptp_xmit()\n\nCommit aabc6596ffb3 (\"net: ppp: Add bound checking for skb data\non ppp_sync_txmung\") fixed ppp_sync_txmunge()\n\nWe need a similar fix in pptp_xmit(), otherwise we might\nread uninit data as reported by syzbot.\n\nBUG: KMSAN: uninit-value in pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193\n  pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193\n  ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2290 [inline]\n  ppp_input+0x1d6/0xe60 drivers/net/ppp/ppp_generic.c:2314\n  pppoe_rcv_core+0x1e8/0x760 drivers/net/ppp/pppoe.c:379\n  sk_backlog_rcv+0x142/0x420 include/net/sock.h:1148\n  __release_sock+0x1d3/0x330 net/core/sock.c:3213\n  release_sock+0x6b/0x270 net/core/sock.c:3767\n  pppoe_sendmsg+0x15d/0xcb0 drivers/net/ppp/pppoe.c:904\n  sock_sendmsg_nosec net/socket.c:712 [inline]\n  __sock_sendmsg+0x330/0x3d0 net/socket.c:727\n  ____sys_sendmsg+0x893/0xd80 net/socket.c:2566\n  ___sys_sendmsg+0x271/0x3b0 net/socket.c:2620\n  __sys_sendmmsg+0x2d9/0x7c0 net/socket.c:2709",
  "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": "6.1.148",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38574"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/97b8c5d322c5c0038cac4bc56fdbe237d0be426f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/26672f1679b143aa34fca0b6046b7fd0c184770d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5de7513f38f3c19c0610294ee478242bea356f8c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/504cc4ab91073d2ac7404ad146139f86ecee7193"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5005d24377378a20e5c0e53052fc4ebdcdcbc611"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ea99b88b1999ebcb24d5d3a6b7910030f40d3bba"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b7dcda76fd0615c0599c89f36873a6cd48e02dbb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1a04db0fd75cb6034fc27a56b67b3b8b9022a98c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/de9c4861fb42f0cd72da844c3c34f692d5895b7b"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z"
  }
}