{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-90230",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-90230"
  ],
  "published": "2026-09-17T16:10:40Z",
  "summary": "nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()\n\nnvmet_execute_auth_send() allocates the DH-HMAC-CHAP message buffer with\nthe host-supplied transfer length (tl) and hands it to\nnvmet_auth_negotiate() without passing tl along. nvmet_auth_negotiate()\nthen reads the negotiate header and, for each of the halen hash\nidentifiers and dhlen DH group identifiers, indexes into the fixed\nidlist[60] array (hashes at idlist[0..halen), groups at idlist[30..]).\n\nNeither the transfer length nor halen/dhlen is validated. A malicious or\nnon-conformant host can report a tl smaller than the negotiate structure,\nor a halen/dhlen larger than the array (both are u8, up to 255), making\nthe loops read past the end of the allocated buffer (heap out-of-bounds\nread). The sibling nvmet_auth_reply() already validates tl against the\nstructure size; the negotiate path did not.\n\nPass tl into nvmet_auth_negotiate(), reject a tl that does not cover the\nnegotiate data plus one full protocol descriptor, and reject halen/dhlen\nlarger than NVME_AUTH_DHCHAP_MAX_DH_IDS.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
    }
  ],
  "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": null,
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-90230"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/89ff11b72f38976f3b5aea23a5228ee05e277209"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/aaac783950b17c57df9b6f7344747cacb1a407ed"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c38a8186326799957d293d370136c128cd113916"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7b81e4d2230e3d2d372c826180c4ef0efc244f31"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5bb96cc218835769ab74ec7f3ea2bf81fbffe955"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-18T17:55:42Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.1,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The malformed bytes are the DH-HMAC-CHAP Negotiate payload of an NVMe-oF Authentication Send capsule (cmd->auth_send.tl). nvmet-tcp receives that capsule in nvmet_tcp_try_recv_pdu/nvmet_tcp_try_recv_data, nvmet_copy_from_sgl copies it, and nvmet_auth_negotiate() parses it; NVMe/TCP is IP-routable.\nAC:L - Unpatched nvmet_auth_negotiate() never checks tl, halen, or dhlen. A host that sets auth_send.tl below 72 bytes (negotiate header plus nvmf_auth_dhchap_protocol_descriptor) and/or sets the u8 halen/dhlen fields to 255 makes the idlist[i] and idlist[i+30] loops deterministically over-read kmalloc(tl) with no race.\nPR:N - nvmet_parse_admin_cmd routes fabrics opcodes to nvmet_parse_fabrics_admin_cmd before nvmet_check_ctrl_status(), so AUTH_SEND runs without nvmet_check_auth_status(). sq->dhchap_step starts at NEGOTIATE, and nvmet_host_allowed() always permits nqn.2014-08.org.nvmexpress.discovery, so no DH-HMAC-CHAP secret is required.\nUI:N - The attacker opens a TCP connection to an already-listening nvmet-tcp port, sends Connect, then Authentication Send carrying the short or over-long DH-HMAC-CHAP Negotiate buffer; no victim mount, file open, or prompt is required.\nS:U - The over-read is of the kmalloc(tl) DH-HMAC-CHAP buffer and adjacent slab on the NVMe target host; it does not cross a VM, hypervisor, or IOMMU boundary.\nC:H - With tl shorter than the 72-byte negotiate-plus-descriptor layout, or with u8 halen/dhlen up to 255 against idlist[60], nvmet_auth_negotiate() heap-over-reads hundreds of bytes of adjacent slab via idlist[i] and idlist[i+30], which is not a few-byte leak.\nI:N - nvmet_auth_negotiate() only loads header fields and idlist[] entries and does not write past the allocation. Assigning ctrl->shash_id or ctrl->dh_gid from a parsed identifier is an in-bounds field update, not an OOB write or hijack primitive.\nA:H - Walking idlist[] hundreds of bytes past a small kmalloc(tl) AUTH_SEND object can oops if the read hits an unmapped page or a KASAN/KFENCE redzone, and the initiator can repeat Authentication Send on new connections to the same target."
    }
  }
}