CVE-2026-90230

Status: ReceivedCritical (9.1)—

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.

Read full descriptionShow less

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.

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Base score: 9.1

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.65%
Percentile among all scored CVEs: 50
Score date: 10/5/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1190 Exploit Public-Facing Applicationinitial access92 %
Primary impactT1005 Data from Local Systemcollection85 %

Red remota sin privilegios (AV:N/PR:N/UI:N) → T1190. Host malicioso explota validación insuficiente de tamaño en nvmet_auth_negotiate() para lectura de heap (C:H).

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Filter Network Traffic Application Isolation and Sandboxing

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Linux — Linux Kernel^AI

References

Raw JSON (NVD)

Show

{
  "id": "CVE-2026-90230",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.1,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "db1312dd95488b5e6ff362ff66fcf953a46b1821",
              "lessThan": "89ff11b72f38976f3b5aea23a5228ee05e277209",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "db1312dd95488b5e6ff362ff66fcf953a46b1821",
              "lessThan": "aaac783950b17c57df9b6f7344747cacb1a407ed",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "db1312dd95488b5e6ff362ff66fcf953a46b1821",
              "lessThan": "c38a8186326799957d293d370136c128cd113916",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "db1312dd95488b5e6ff362ff66fcf953a46b1821",
              "lessThan": "7b81e4d2230e3d2d372c826180c4ef0efc244f31",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "db1312dd95488b5e6ff362ff66fcf953a46b1821",
              "lessThan": "5bb96cc218835769ab74ec7f3ea2bf81fbffe955",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/nvme/target/fabrics-cmd-auth.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.0"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/nvme/target/fabrics-cmd-auth.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-17T17:17:18.803",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/5bb96cc218835769ab74ec7f3ea2bf81fbffe955",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7b81e4d2230e3d2d372c826180c4ef0efc244f31",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/89ff11b72f38976f3b5aea23a5228ee05e277209",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/aaac783950b17c57df9b6f7344747cacb1a407ed",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c38a8186326799957d293d370136c128cd113916",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "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."
    }
  ],
  "lastModified": "2026-09-18T18:17:47.987",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}