CVE-2023-53817 (GCVE-0-2023-53817)
Vulnerability from cvelistv5
Published
2025-12-09 00:01
Modified
2026-08-05 09:16
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: crypto: lib/mpi - avoid null pointer deref in mpi_cmp_ui() During NVMeTCP Authentication a controller can trigger a kernel oops by specifying the 8192 bit Diffie Hellman group and passing a correctly sized, but zeroed Diffie Hellamn value. mpi_cmp_ui() was detecting this if the second parameter was 0, but 1 is passed from dh_is_pubkey_valid(). This causes the null pointer u->d to be dereferenced towards the end of mpi_cmp_ui()
References
Impacted products
Vendor Product Version
Linux Linux Version: 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5
Version: 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5
Version: 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5
Version: 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5
Version: 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5
Version: 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5
Version: 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5
Version: 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "lib/crypto/mpi/mpi-cmp.c"
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              "version": "0",
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              "version": "6.6",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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          "nodes": [
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              ],
              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: lib/mpi - avoid null pointer deref in mpi_cmp_ui()\n\nDuring NVMeTCP Authentication a controller can trigger a kernel\noops by specifying the 8192 bit Diffie Hellman group and passing\na correctly sized, but zeroed Diffie Hellamn value.\nmpi_cmp_ui() was detecting this if the second parameter was 0,\nbut 1 is passed from dh_is_pubkey_valid(). This causes the null\npointer u-\u003ed to be dereferenced towards the end of mpi_cmp_ui()"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable code is reached from NVMe-over-Fabrics (NVMe/TCP) DH-HMAC-CHAP authentication data received from a remote peer \u2014 either a malicious/MITM controller sending a Challenge to a host, or a remote initiator sending a Reply to an nvmet-tcp target on TCP/4420. The attacker-controlled bytes travel over the network with no locality requirement.\nAC:L - Triggering is fully deterministic: the attacker simply advertises a non-NULL DH group (e.g. ffdhe8192) and supplies a correctly sized but all-zero DH value, which makes mpi_read_raw_from_sgl() produce an MPI with nlimbs==0 and d==NULL. No race, no memory-layout dependency, and NVMe/TCP in-band authentication is a normal shipped configuration.\nPR:N - On the target side nvmet_auth_reply() computes the DH shared secret from the peer\u0027s DH value before the DH-HMAC-CHAP response HMAC is verified, so this is a pre-authentication code path; on the host side an impersonating/MITM controller needs no credentials to send the Challenge.\nUI:N - An nvmet-tcp target listens passively and the attacker drives the whole DH-HMAC-CHAP exchange; no local user action is required to trigger the oops.\nS:U - The NULL dereference crashes the kernel that is processing the authentication message; the impact stays within that kernel\u0027s own security authority with no boundary crossing.\nC:N - The fault is a read of address 0 (u-\u003ed[0]) that immediately oopses; no attacker-influenced memory is read back or returned to the peer, so no information is disclosed.\nI:N - The bug is a NULL pointer read, not a write or type confusion; nothing is corrupted and there is no primitive for modifying kernel memory or hijacking control flow.\nA:H - Dereferencing the NULL u-\u003ed produces a kernel oops in the NVMe auth work handler, killing the connection/worker and panicking the box under panic_on_oops, and it can be re-triggered on every new authentication attempt."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:16:11.527Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fde791e8a96a64ea7b0ad2440e43586447a209c6"
        },
        {
          "url": "https://git.kernel.org/stable/c/ae63e84ffda74267bf7277c38415ba38389229a0"
        },
        {
          "url": "https://git.kernel.org/stable/c/61f5453e9706e99713825594e0c8f9031485fb5f"
        },
        {
          "url": "https://git.kernel.org/stable/c/0fc7147c694394f8a8cbc19570c6bc918cac0906"
        },
        {
          "url": "https://git.kernel.org/stable/c/67589d247909043e94d2dd5fb590958e0f99d58d"
        },
        {
          "url": "https://git.kernel.org/stable/c/d3ad023a39f1127dcfd331c562673355dc078650"
        },
        {
          "url": "https://git.kernel.org/stable/c/12ac013ad7ff0df066451e825801d805095b3776"
        },
        {
          "url": "https://git.kernel.org/stable/c/9e47a758b70167c9301d2b44d2569f86c7796f2d"
        }
      ],
      "title": "crypto: lib/mpi - avoid null pointer deref in mpi_cmp_ui()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-53817",
    "datePublished": "2025-12-09T00:01:15.411Z",
    "dateReserved": "2025-12-08T23:58:35.277Z",
    "dateUpdated": "2026-08-05T09:16:11.527Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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