CVE-2025-38574 (GCVE-0-2025-38574)
Vulnerability from cvelistv5
Published
2025-08-19 17:02
Modified
2025-08-28 14:43
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: pptp: ensure minimal skb length in pptp_xmit() Commit aabc6596ffb3 ("net: ppp: Add bound checking for skb data on ppp_sync_txmung") fixed ppp_sync_txmunge() We need a similar fix in pptp_xmit(), otherwise we might read uninit data as reported by syzbot. BUG: KMSAN: uninit-value in pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193 pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193 ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2290 [inline] ppp_input+0x1d6/0xe60 drivers/net/ppp/ppp_generic.c:2314 pppoe_rcv_core+0x1e8/0x760 drivers/net/ppp/pppoe.c:379 sk_backlog_rcv+0x142/0x420 include/net/sock.h:1148 __release_sock+0x1d3/0x330 net/core/sock.c:3213 release_sock+0x6b/0x270 net/core/sock.c:3767 pppoe_sendmsg+0x15d/0xcb0 drivers/net/ppp/pppoe.c:904 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x330/0x3d0 net/socket.c:727 ____sys_sendmsg+0x893/0xd80 net/socket.c:2566 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2620 __sys_sendmmsg+0x2d9/0x7c0 net/socket.c:2709
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1a04db0fd75cb6034fc27a56b67b3b8b9022a98c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/26672f1679b143aa34fca0b6046b7fd0c184770d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5005d24377378a20e5c0e53052fc4ebdcdcbc611
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/504cc4ab91073d2ac7404ad146139f86ecee7193
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5de7513f38f3c19c0610294ee478242bea356f8c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/97b8c5d322c5c0038cac4bc56fdbe237d0be426f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b7dcda76fd0615c0599c89f36873a6cd48e02dbb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/de9c4861fb42f0cd72da844c3c34f692d5895b7b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ea99b88b1999ebcb24d5d3a6b7910030f40d3bba
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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   Linux Linux Version: 2.6.12
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{
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              "versionType": "original_commit_for_fix"
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      "descriptions": [
        {
          "lang": "en",
          "value": "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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-08-28T14:43:53.698Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        {
          "url": "https://git.kernel.org/stable/c/de9c4861fb42f0cd72da844c3c34f692d5895b7b"
        }
      ],
      "title": "pptp: ensure minimal skb length in pptp_xmit()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38574",
    "datePublished": "2025-08-19T17:02:53.866Z",
    "dateReserved": "2025-04-16T04:51:24.025Z",
    "dateUpdated": "2025-08-28T14:43:53.698Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38574\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-08-19T17:15:34.427\",\"lastModified\":\"2025-08-28T15:15:53.740\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: pptp: garantizar la longitud m\u00ednima de skb en pptp_xmit() Se corrigi\u00f3 el commit aabc6596ffb3 (\\\"net: ppp: agregar verificaci\u00f3n de l\u00edmite para datos skb en ppp_sync_txmung\\\") ppp_sync_txmunge() Necesitamos una soluci\u00f3n similar en pptp_xmit(); de lo contrario, podr\u00edamos leer datos no inicializados como lo inform\u00f3 syzbot. ERROR: KMSAN: uninit-value in pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193 pptp_xmit+0xc34/0x2720 drivers/net/ppp/pptp.c:193 ppp_channel_bridge_input drivers/net/ppp/ppp_generic.c:2290 [inline] ppp_input+0x1d6/0xe60 drivers/net/ppp/ppp_generic.c:2314 pppoe_rcv_core+0x1e8/0x760 drivers/net/ppp/pppoe.c:379 sk_backlog_rcv+0x142/0x420 include/net/sock.h:1148 __release_sock+0x1d3/0x330 net/core/sock.c:3213 release_sock+0x6b/0x270 net/core/sock.c:3767 pppoe_sendmsg+0x15d/0xcb0 drivers/net/ppp/pppoe.c:904 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x330/0x3d0 net/socket.c:727 ____sys_sendmsg+0x893/0xd80 net/socket.c:2566 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2620 __sys_sendmmsg+0x2d9/0x7c0 net/socket.c:2709 \"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1a04db0fd75cb6034fc27a56b67b3b8b9022a98c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/26672f1679b143aa34fca0b6046b7fd0c184770d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5005d24377378a20e5c0e53052fc4ebdcdcbc611\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/504cc4ab91073d2ac7404ad146139f86ecee7193\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5de7513f38f3c19c0610294ee478242bea356f8c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/97b8c5d322c5c0038cac4bc56fdbe237d0be426f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b7dcda76fd0615c0599c89f36873a6cd48e02dbb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/de9c4861fb42f0cd72da844c3c34f692d5895b7b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ea99b88b1999ebcb24d5d3a6b7910030f40d3bba\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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