CVE-2026-72130 (GCVE-0-2026-72130)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:53 – Updated: 2026-08-17 05:40
VLAI
Title
nvmet-auth: reject short AUTH_RECEIVE buffers
Summary
In the Linux kernel, the following vulnerability has been resolved: nvmet-auth: reject short AUTH_RECEIVE buffers nvmet_execute_auth_receive() trusts the AUTH_RECEIVE allocation length after checking only that it is nonzero and matches the transfer length. In the SUCCESS1 and FAILURE1/default states, that lets a remote NVMe-oF initiator reach the fixed-size DH-HMAC-CHAP response builders with a kmalloc() buffer shorter than the response, so nvmet_auth_success1() and nvmet_auth_failure1() write past the allocation; both only WARN_ON the short length and then format the message anyway. Impact: A remote NVMe-oF initiator with access to an auth-enabled target can trigger a 16-byte heap out-of-bounds write via a one-byte AUTH_RECEIVE allocation length. Compute the minimum response length for the current DH-HMAC-CHAP step in nvmet_auth_receive_data_len() and report a zero data length when the host-supplied allocation length is shorter, so the existing zero-length check in nvmet_execute_auth_receive() rejects the command before any builder runs. The SUCCESS1 minimum is sizeof(struct nvmf_auth_dhchap_success1_data) plus the HMAC hash length, because the response hash is written into the rval[] flexible-array tail, so the minimum is state dependent rather than a flat sizeof. CHALLENGE keeps its existing variable-length guard in nvmet_auth_challenge(). This is reachable only when in-band DH-HMAC-CHAP authentication is configured on the target.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: db1312dd95488b5e6ff362ff66fcf953a46b1821 , < 80bf7b7f676e3987bbe06af3c359bd56ac91a5a9 (git)
Affected: db1312dd95488b5e6ff362ff66fcf953a46b1821 , < 2eaa3ad450141cfcf187bb43cb8335eb336b5f87 (git)
Affected: db1312dd95488b5e6ff362ff66fcf953a46b1821 , < bc111698b46e43eddd8664cceaa621cd559e99a0 (git)
Affected: db1312dd95488b5e6ff362ff66fcf953a46b1821 , < 779575bc35c687697ba69e904f2cd22e60112534 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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      "affected": [
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          "product": "Linux",
          "programFiles": [
            "drivers/nvme/target/fabrics-cmd-auth.c"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-auth: reject short AUTH_RECEIVE buffers\n\nnvmet_execute_auth_receive() trusts the AUTH_RECEIVE allocation length\nafter checking only that it is nonzero and matches the transfer length.\nIn the SUCCESS1 and FAILURE1/default states, that lets a remote NVMe-oF\ninitiator reach the fixed-size DH-HMAC-CHAP response builders with a\nkmalloc() buffer shorter than the response, so nvmet_auth_success1() and\nnvmet_auth_failure1() write past the allocation; both only WARN_ON the\nshort length and then format the message anyway.\n\nImpact: A remote NVMe-oF initiator with access to an auth-enabled target\ncan trigger a 16-byte heap out-of-bounds write via a one-byte\nAUTH_RECEIVE allocation length.\n\nCompute the minimum response length for the current DH-HMAC-CHAP step in\nnvmet_auth_receive_data_len() and report a zero data length when the\nhost-supplied allocation length is shorter, so the existing zero-length\ncheck in nvmet_execute_auth_receive() rejects the command before any\nbuilder runs. The SUCCESS1 minimum is sizeof(struct\nnvmf_auth_dhchap_success1_data) plus the HMAC hash length, because the\nresponse hash is written into the rval[] flexible-array tail, so the\nminimum is state dependent rather than a flat sizeof. CHALLENGE keeps its\nexisting variable-length guard in nvmet_auth_challenge().\n\nThis is reachable only when in-band DH-HMAC-CHAP authentication is\nconfigured on the target."
        }
      ],
      "metrics": [
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
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              "lang": "en",
              "value": "AV:N - The bug is in nvmet DH-HMAC-CHAP AUTH_RECEIVE handling reached by remote NVMe-oF initiators over network transports (nvmet-tcp/RDMA/FC); malicious allocation length arrives in a Fabrics command capsule from the network.\nAC:L - Once an auth-enabled target is reachable, the attacker fully controls AUTH_RECEIVE allocation length and can reliably reach vulnerable states (e.g. default NEGOTIATE branch or FAILURE1) without conditions beyond their control.\nPR:N - Exploitation occurs on the pre-authentication DH-HMAC-CHAP handshake before credentials are verified; no Linux privileges on the target are required, only network access to an auth-configured NVMe-oF target port.\nUI:N - No victim user action is required beyond the administrator having already deployed an NVMe-oF target; exploitation is driven entirely by attacker-sent Fabrics authentication commands.\nS:U - Impact is kernel heap memory corruption within the NVMe target subsystem on the same host; it does not cross a VM/hypervisor or IOMMU security boundary by itself.\nC:H - A controlled heap out-of-bounds write (up to 16 bytes plus optional HMAC tail in SUCCESS1) can corrupt adjacent kmalloc objects and be leveraged for kernel information disclosure, per memory-corruption guidance.\nI:H - The vulnerability is a heap out-of-bounds write in kernel context; such corruption is exploitable for arbitrary memory modification and potential code execution, not merely a bounded logic error.\nA:H - Heap corruption can cause kernel oops/panic, and the FAILURE1 AUTH_RECEIVE completion path calls nvmet_ctrl_fatal_error(), taking down the NVMe controller and denying service to connected initiators."
            }
          ]
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      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:40:42.219Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/779575bc35c687697ba69e904f2cd22e60112534"
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    "cveId": "CVE-2026-72130",
    "datePublished": "2026-08-15T05:53:06.604Z",
    "dateReserved": "2026-08-09T03:40:39.907Z",
    "dateUpdated": "2026-08-17T05:40:42.219Z",
    "state": "PUBLISHED"
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      "date": "2026-09-20",
      "epss": "0.00748",
      "percentile": "0.53366"
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      "initial_release_date": "2026-08-23T15:03:32.000Z",
      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "nvmet-auth: reject short AUTH_RECEIVE buffers",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-72130.json",
      "version": "1"
    },
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-auth: reject short AUTH_RECEIVE buffers\n\nnvmet_execute_auth_receive() trusts the AUTH_RECEIVE allocation length\nafter checking only that it is nonzero and matches the transfer length.\nIn the SUCCESS1 and FAILURE1/default states, that lets a remote NVMe-oF\ninitiator reach the fixed-size DH-HMAC-CHAP response builders with a\nkmalloc() buffer shorter than the response, so nvmet_auth_success1() and\nnvmet_auth_failure1() write past the allocation; both only WARN_ON the\nshort length and then format the message anyway.\n\nImpact: A remote NVMe-oF initiator with access to an auth-enabled target\ncan trigger a 16-byte heap out-of-bounds write via a one-byte\nAUTH_RECEIVE allocation length.\n\nCompute the minimum response length for the current DH-HMAC-CHAP step in\nnvmet_auth_receive_data_len() and report a zero data length when the\nhost-supplied allocation length is shorter, so the existing zero-length\ncheck in nvmet_execute_auth_receive() rejects the command before any\nbuilder runs. The SUCCESS1 minimum is sizeof(struct\nnvmf_auth_dhchap_success1_data) plus the HMAC hash length, because the\nresponse hash is written into the rval[] flexible-array tail, so the\nminimum is state dependent rather than a flat sizeof. CHALLENGE keeps its\nexisting variable-length guard in nvmet_auth_challenge().\n\nThis is reachable only when in-band DH-HMAC-CHAP authentication is\nconfigured on the target."
          }
        ],
        "id": "CVE-2026-72130",
        "lastModified": "2026-08-17T06:18:12.680",
        "metrics": {
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                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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        "published": "2026-08-15T06:21:30.453",
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      "current_release_date": "2026-09-04T07:53:48+00:00",
      "cve": "CVE-2026-72130",
      "id": "CVE-2026-72130",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:fixed": "612",
      "product_status:known_affected": "22",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nvmet-auth: reject short AUTH_RECEIVE buffers",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72130.json",
      "version": "3"
    },
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      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:29:09Z",
      "cve": "CVE-2026-72130",
      "id": "CVE-2026-72130",
      "initial_release_date": "2026-08-18T16:54:52Z",
      "product_status:known_affected": "29",
      "product_status:known_not_affected": "333",
      "product_status:recommended": "83",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-72130",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72130.json",
      "version": "4"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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