CVE-2026-90230 (GCVE-0-2026-90230)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:07 – Updated: 2026-10-19 09:00
VLAI
Title
nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
Summary
In the Linux kernel, the following vulnerability has been resolved: nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate() nvmet_execute_auth_send() allocates the DH-HMAC-CHAP message buffer with the host-supplied transfer length (tl) and hands it to nvmet_auth_negotiate() without passing tl along. nvmet_auth_negotiate() then reads the negotiate header and, for each of the halen hash identifiers and dhlen DH group identifiers, indexes into the fixed idlist[60] array (hashes at idlist[0..halen), groups at idlist[30..]). Neither the transfer length nor halen/dhlen is validated. A malicious or non-conformant host can report a tl smaller than the negotiate structure, or a halen/dhlen larger than the array (both are u8, up to 255), making the loops read past the end of the allocated buffer (heap out-of-bounds read). The sibling nvmet_auth_reply() already validates tl against the structure size; the negotiate path did not. Pass tl into nvmet_auth_negotiate(), reject a tl that does not cover the negotiate data plus one full protocol descriptor, and reject halen/dhlen larger than NVME_AUTH_DHCHAP_MAX_DH_IDS.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6649 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: db1312dd95488b5e6ff362ff66fcf953a46b1821 , < 89ff11b72f38976f3b5aea23a5228ee05e277209 (git)
Affected: db1312dd95488b5e6ff362ff66fcf953a46b1821 , < aaac783950b17c57df9b6f7344747cacb1a407ed (git)
Affected: db1312dd95488b5e6ff362ff66fcf953a46b1821 , < c38a8186326799957d293d370136c128cd113916 (git)
Affected: db1312dd95488b5e6ff362ff66fcf953a46b1821 , < 7b81e4d2230e3d2d372c826180c4ef0efc244f31 (git)
Affected: db1312dd95488b5e6ff362ff66fcf953a46b1821 , < 5bb96cc218835769ab74ec7f3ea2bf81fbffe955 (git)
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Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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Show details on NVD website
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      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The malformed bytes are the DH-HMAC-CHAP Negotiate payload of an NVMe-oF Authentication Send capsule (cmd-\u003eauth_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-\u003edhchap_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-\u003eshash_id or ctrl-\u003edh_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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:00:06.762Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90230",
    "datePublished": "2026-09-17T16:07:37.940Z",
    "dateReserved": "2026-09-11T19:38:34.794Z",
    "dateUpdated": "2026-10-19T09:00:06.762Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-11-04",
      "epss": "0.00457",
      "percentile": "0.39773"
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    "microsoft_vex": {
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      "cve": "CVE-2026-90230",
      "id": "msrc_CVE-2026-90230",
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      "product_status:fixed": "1",
      "product_status:known_affected": "2",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()",
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                "versions": [
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            "lang": "en",
            "value": "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."
          }
        ],
        "id": "CVE-2026-90230",
        "lastModified": "2026-10-19T09:19:13.423",
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                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-30T06:29:13+00:00",
      "cve": "CVE-2026-90230",
      "id": "CVE-2026-90230",
      "initial_release_date": "2026-09-17T00:00:00+00:00",
      "product_status:known_affected": "188",
      "product_status:known_not_affected": "91",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90230.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-04T00:54:55Z",
      "cve": "CVE-2026-90230",
      "id": "CVE-2026-90230",
      "initial_release_date": "2026-09-21T16:30:07Z",
      "product_status:known_affected": "193",
      "product_status:known_not_affected": "0",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-90230",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-90230.json",
      "version": "6"
    }
  }
}



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