IB/isert: reject login PDUs declaring more data than was received

{
  "id": "1377353413a52899a26438a74532f08e1cede2c6d07bb124b38cc194f8d11f4a",
  "url": "https://osv.dev/vulnerability/CVE-2026-90413",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "IB/isert: reject login PDUs declaring more data than was received",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: IB/isert: reject login PDUs declaring more data than was received isert_login_recv_done() records how many bytes the HCA actually placed in the login buffer, but nothing compares that against the length the login PDU's BHS declares. isert_rx_login_req() copies min(login_req_len, MAX_KEY_VALUE_PAIRS) bytes into login->req_buf, and the login code then reads the declared length back out of that buffer - for the first PDU in iscsi_target_locate_portal(), payload_length = ntoh24(login_req->dlength); tmpbuf = kmemdup_nul(login->req_buf, payload_length, GFP_KERNEL); and for the ones after it in iscsi_decode_text_input(), reached from iscsi_target_do_login(). login->req_buf is a fixed MAX_KEY_VALUE_PAIRS (8192) byte allocation, so an initiator that declares more than it sends reads off the end of it, before authentication and with the length under its control: BUG: KASAN: slab-out-of-bounds in kmemdup_nul+0x43/0x80 Read of size 8193 at addr ffff8881056a8000 by task iscsi_np/167 __asan_memcpy+0x23/0x60 kmemdup_nul+0x43/0x80 iscsi_target_locate_portal+0x48d/0x1180 iscsi_target_login_thread+0x19a9/0x3350 Allocated by task 167: __kmalloc_cache_noprof+0x158/0x370 iscsi_target_login_thread+0x971/0x3350 which belongs to the cache kmalloc-8k of size 8192 allocated 8192-byte region Falsifying the second login PDU instead reaches the other reader, on the same buffer: BUG: KASAN: slab-out-of-bounds in kmemdup_nul+0x43/0x80 Read",
    "evidence": "osv:CVE-2026-90413",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.270",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.221",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.188",
            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-90413",
      "aliases": [
        "CVE-2026-90413"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
        }
      ],
      "affected": [
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                {
                  "fixed": "228aaa620fe6a7bc8b5b21dd348b4836b1760c61"
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                {
                  "fixed": "0d9c0586af703890afe1bd0cfe641e3a3af1c32d"
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                  "fixed": "44fe800ec13386c88bd5b32bcd1deaa1e17535d5"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90413.json"
          }
        },
        {
          "ranges": [
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              "type": "ECOSYSTEM",
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                  "introduced": "3.10.0"
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          "package": {
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            "ecosystem": "Linux"
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          "database_specific": {
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      ],
      "modified": "2026-10-28T02:30:23.750860402Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0d9c0586af703890afe1bd0cfe641e3a3af1c32d",
        "https://git.kernel.org/stable/c/228aaa620fe6a7bc8b5b21dd348b4836b1760c61",
        "https://git.kernel.org/stable/c/2488b5b4827e5415768afc8daf097e8eb83c98df",
        "https://git.kernel.org/stable/c/44fe800ec13386c88bd5b32bcd1deaa1e17535d5",
        "https://git.kernel.org/stable/c/48812c8103071d550d9ab4a3431be5bdc52255bc",
        "https://git.kernel.org/stable/c/71ec8bbfa4a183f1e623662f9cfbcd702e433bdb",
        "https://git.kernel.org/stable/c/b1f3313e7b3e396e4985fea5c709477387e0a065",
        "https://git.kernel.org/stable/c/c345d9d0b3eefc990bb90cf565325785aab06aab",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90413.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-90413",
        "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-2026-90413.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-90413",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490264,
  "published_at": "2026-09-17T16:09:39.383+00:00"
}