CVE-2025-38006 (GCVE-0-2025-38006)
Vulnerability from cvelistv5
Published
2025-06-18 09:28
Modified
2025-06-18 09:28
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: mctp: Don't access ifa_index when missing In mctp_dump_addrinfo, ifa_index can be used to filter interfaces, but only when the struct ifaddrmsg is provided. Otherwise it will be comparing to uninitialised memory - reproducible in the syzkaller case from dhcpd, or busybox "ip addr show". The kernel MCTP implementation has always filtered by ifa_index, so existing userspace programs expecting to dump MCTP addresses must already be passing a valid ifa_index value (either 0 or a real index). BUG: KMSAN: uninit-value in mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128 mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128 rtnl_dump_all+0x3ec/0x5b0 net/core/rtnetlink.c:4380 rtnl_dumpit+0xd5/0x2f0 net/core/rtnetlink.c:6824 netlink_dump+0x97b/0x1690 net/netlink/af_netlink.c:2309
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/24fa213dffa470166ec014f979f36c6ff44afb45
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/acab78ae12c7fefb4f3bfe22e00770a5faa42724
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d4d1561d17eb72908e4489c0900d96e0484fac20
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f11cf946c0a92c560a890d68e4775723353599e1
Impacted products
Vendor Product Version
Linux Linux Version: 583be982d93479ea3d85091b0fd0b01201ede87d
Version: 583be982d93479ea3d85091b0fd0b01201ede87d
Version: 583be982d93479ea3d85091b0fd0b01201ede87d
Version: 583be982d93479ea3d85091b0fd0b01201ede87d
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   Linux Linux Version: 5.15
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{
  "containers": {
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      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mctp/device.c"
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mctp: Don\u0027t access ifa_index when missing\n\nIn mctp_dump_addrinfo, ifa_index can be used to filter interfaces, but\nonly when the struct ifaddrmsg is provided. Otherwise it will be\ncomparing to uninitialised memory - reproducible in the syzkaller case from\ndhcpd, or busybox \"ip addr show\".\n\nThe kernel MCTP implementation has always filtered by ifa_index, so\nexisting userspace programs expecting to dump MCTP addresses must\nalready be passing a valid ifa_index value (either 0 or a real index).\n\nBUG: KMSAN: uninit-value in mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128\n mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128\n rtnl_dump_all+0x3ec/0x5b0 net/core/rtnetlink.c:4380\n rtnl_dumpit+0xd5/0x2f0 net/core/rtnetlink.c:6824\n netlink_dump+0x97b/0x1690 net/netlink/af_netlink.c:2309"
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      "providerMetadata": {
        "dateUpdated": "2025-06-18T09:28:17.773Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "net: mctp: Don\u0027t access ifa_index when missing",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38006",
    "datePublished": "2025-06-18T09:28:17.773Z",
    "dateReserved": "2025-04-16T04:51:23.977Z",
    "dateUpdated": "2025-06-18T09:28:17.773Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38006\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T10:15:31.773\",\"lastModified\":\"2025-06-18T13:46:52.973\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: mctp: Don\u0027t access ifa_index when missing\\n\\nIn mctp_dump_addrinfo, ifa_index can be used to filter interfaces, but\\nonly when the struct ifaddrmsg is provided. Otherwise it will be\\ncomparing to uninitialised memory - reproducible in the syzkaller case from\\ndhcpd, or busybox \\\"ip addr show\\\".\\n\\nThe kernel MCTP implementation has always filtered by ifa_index, so\\nexisting userspace programs expecting to dump MCTP addresses must\\nalready be passing a valid ifa_index value (either 0 or a real index).\\n\\nBUG: KMSAN: uninit-value in mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128\\n mctp_dump_addrinfo+0x208/0xac0 net/mctp/device.c:128\\n rtnl_dump_all+0x3ec/0x5b0 net/core/rtnetlink.c:4380\\n rtnl_dumpit+0xd5/0x2f0 net/core/rtnetlink.c:6824\\n netlink_dump+0x97b/0x1690 net/netlink/af_netlink.c:2309\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/24fa213dffa470166ec014f979f36c6ff44afb45\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/acab78ae12c7fefb4f3bfe22e00770a5faa42724\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d4d1561d17eb72908e4489c0900d96e0484fac20\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f11cf946c0a92c560a890d68e4775723353599e1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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