smb: server: fix leak of ksmbd_ipc_login_request_ext() returned buffer

{
  "id": "999dd2332ea1e9e38e57648b94949648c4dc9a735012ed0cea0394204b71e1a0",
  "url": "https://osv.dev/vulnerability/CVE-2026-90175",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "smb: server: fix leak of ksmbd_ipc_login_request_ext() returned buffer",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: smb: server: fix leak of ksmbd_ipc_login_request_ext() returned buffer Free it unconditionally after ksmbd_alloc_user() calls. kmemleak splat: unreferenced object 0xffff888103b83540 (size 192): comm \"pool-0\", pid 16970, jiffies 4377290937 hex dump (first 32 bytes): 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace (crc 408ccc66): __kvmalloc_node_noprof+0x730/0x920 handle_generic_event+0xec/0x1a0 [ksmbd] genl_family_rcv_msg_doit+0xe0/0x130 genl_rcv_msg+0x181/0x290 netlink_rcv_skb+0x4f/0x100 genl_rcv+0x28/0x40 netlink_unicast+0x1e6/0x2c0 netlink_sendmsg+0x20a/0x450 ____sys_sendmsg+0x2e8/0x310 ___sys_sendmsg+0x78/0xc0 __sys_sendmsg+0x63/0xc0 do_syscall_64+0xa1/0x670 entry_SYSCALL_64_after_hwframe+0x76/0x7e",
    "evidence": "osv:CVE-2026-90175",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.157",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.110",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.52",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-90175",
      "aliases": [
        "CVE-2026-90175"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                {
                  "fixed": "4d6fe49fa3e7fbd779c761518e6572e340233c9b"
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "a77e0e02af1c2db5fc040511aa78a58a52e116ab"
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                {
                  "fixed": "c9f2872e91b9fe99c1d0ba768906f7aeb48c8517"
                },
                {
                  "fixed": "7a98c3b903b10c4d6176948254012b5ca24b071b"
                },
                {
                  "fixed": "abb5146b2d8197d695ea9eaa0847c73e34f00985"
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                {
                  "fixed": "1c3ebf832d010c08afe1359215d4121cb1ed2de5"
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                  "introduced": "6.6.141"
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                {
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          "versions": [
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            "v6.6.155",
            "v6.6.154",
            "v6.6.153",
            "v6.6.152",
            "v6.6.151",
            "v6.6.150",
            "v6.6.149",
            "v6.6.148",
            "v6.6.147",
            "v6.6.146",
            "v6.6.145",
            "v6.6.144",
            "v6.6.143",
            "v6.6.142",
            "v6.6.141"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90175.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "6.6.157"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.110"
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              ]
            },
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              "events": [
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                  "introduced": "6.12.0"
                },
                {
                  "fixed": "6.18.52"
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              ]
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            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
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                {
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              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90175.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.935764612Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1c3ebf832d010c08afe1359215d4121cb1ed2de5",
        "https://git.kernel.org/stable/c/4d6fe49fa3e7fbd779c761518e6572e340233c9b",
        "https://git.kernel.org/stable/c/7a98c3b903b10c4d6176948254012b5ca24b071b",
        "https://git.kernel.org/stable/c/abb5146b2d8197d695ea9eaa0847c73e34f00985",
        "https://git.kernel.org/stable/c/c9f2872e91b9fe99c1d0ba768906f7aeb48c8517",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90175.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90175",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90175.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-90175",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 490610,
  "published_at": "2026-09-17T16:07:01.769+00:00"
}