FKIE_CVE-2023-54250

Vulnerability from fkie_nvd - Published: 2025-12-30 13:16 - Updated: 2026-06-17 06:47
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: avoid out of bounds access in decode_preauth_ctxt() Confirm that the accessed pneg_ctxt->HashAlgorithms address sits within the SMB request boundary; deassemble_neg_contexts() only checks that the eight byte smb2_neg_context header + (client controlled) DataLength are within the packet boundary, which is insufficient. Checking for sizeof(struct smb2_preauth_neg_context) is overkill given that the type currently assumes SMB311_SALT_SIZE bytes of trailing Salt.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/39f5b4b313b445c980a2a295bed28228c29228ed
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a2f6ded41bec1d3be643c80a5eb97f1680309001
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e7067a446264a7514fa1cfaa4052cdb6803bc6a2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f02edb9debbd36f44efa7567031485892c7df60d
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ksmbd/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "39f5b4b313b445c980a2a295bed28228c29228ed",
              "status": "affected",
              "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
              "versionType": "git"
            },
            {
              "lessThan": "a2f6ded41bec1d3be643c80a5eb97f1680309001",
              "status": "affected",
              "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
              "versionType": "git"
            },
            {
              "lessThan": "f02edb9debbd36f44efa7567031485892c7df60d",
              "status": "affected",
              "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
              "versionType": "git"
            },
            {
              "lessThan": "e7067a446264a7514fa1cfaa4052cdb6803bc6a2",
              "status": "affected",
              "version": "e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ksmbd/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.25",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.2.*",
              "status": "unaffected",
              "version": "6.2.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: avoid out of bounds access in decode_preauth_ctxt()\n\nConfirm that the accessed pneg_ctxt-\u003eHashAlgorithms address sits within\nthe SMB request boundary; deassemble_neg_contexts() only checks that the\neight byte smb2_neg_context header + (client controlled) DataLength are\nwithin the packet boundary, which is insufficient.\n\nChecking for sizeof(struct smb2_preauth_neg_context) is overkill given\nthat the type currently assumes SMB311_SALT_SIZE bytes of trailing Salt."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nksmbd: evitar el acceso fuera de l\u00edmites en decode_preauth_ctxt()\n\nConfirmar que la direcci\u00f3n pneg_ctxt-\u0026gt;HashAlgorithms accedida se encuentra dentro del l\u00edmite de la solicitud SMB; deassemble_neg_contexts() solo verifica que el encabezado smb2_neg_context de ocho bytes + (DataLength controlada por el cliente) est\u00e9n dentro del l\u00edmite del paquete, lo cual es insuficiente.\n\nVerificar sizeof(struct smb2_preauth_neg_context) es excesivo dado que el tipo actualmente asume SMB311_SALT_SIZE bytes de Salt final."
    }
  ],
  "id": "CVE-2023-54250",
  "lastModified": "2026-06-17T06:47:05.687",
  "metrics": {},
  "published": "2025-12-30T13:16:13.660",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/39f5b4b313b445c980a2a295bed28228c29228ed"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a2f6ded41bec1d3be643c80a5eb97f1680309001"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e7067a446264a7514fa1cfaa4052cdb6803bc6a2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f02edb9debbd36f44efa7567031485892c7df60d"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}


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