CVE-2023-54250 (GCVE-0-2023-54250)
Vulnerability from cvelistv5
Published
2025-12-30 12:15
Modified
2025-12-30 12:15
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
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
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          "product": "Linux",
          "programFiles": [
            "fs/ksmbd/smb2pdu.c"
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              "operator": "OR"
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      "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."
        }
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      "providerMetadata": {
        "dateUpdated": "2025-12-30T12:15:47.467Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
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    "cveId": "CVE-2023-54250",
    "datePublished": "2025-12-30T12:15:47.467Z",
    "dateReserved": "2025-12-30T12:06:44.514Z",
    "dateUpdated": "2025-12-30T12:15:47.467Z",
    "state": "PUBLISHED"
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  }
}


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