{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-22037",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-22037"
  ],
  "published": "2025-04-16T14:14:59Z",
  "summary": "ksmbd: fix null pointer dereference in alloc_preauth_hash()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix null pointer dereference in alloc_preauth_hash()\n\nThe Client send malformed smb2 negotiate request. ksmbd return error\nresponse. Subsequently, the client can send smb2 session setup even\nthought conn->preauth_info is not allocated.\nThis patch add KSMBD_SESS_NEED_SETUP status of connection to ignore\nsession setup request if smb2 negotiate phase is not complete.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
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            "linux_commit": "121c2c384b9c2f4790ffb31b2cd25c7d75c8fda0",
            "upstream_version": "6.12.19",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.23"
          },
          "1:6.12.19-1+rpt1": {
            "linux_commit": "121c2c384b9c2f4790ffb31b2cd25c7d75c8fda0",
            "upstream_version": "6.12.19",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.23"
          },
          "1:6.12.20-1+rpt1": {
            "linux_commit": "cd231d4775b14f228606c09f219b48308f6ab3aa",
            "upstream_version": "6.12.20",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.23"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-22037"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cce57cd8c5dead24127cf2308fdd60fcad2d6ba6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ca8bed31edf728a662ef9d6f39f50e7a7dc2b5ad"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8f216b33a5e1b3489c073b1ea1b3d7cb63c8dc4d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b8eb243e670ecf30e91524dd12f7260dac07d335"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c8b5b7c5da7d0c31c9b7190b4a7bba5281fc4780"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - ksmbd is the in-kernel SMB server processing attacker-supplied SMB2 NEGOTIATE and SESSION_SETUP PDUs from any remote client on TCP/445. The entire trigger sequence consists of network packets sent over a single TCP connection.\nAC:L - The attacker fully controls all three PDUs and the sequence is deterministic \u2014 a valid SMB 3.1.1 negotiate, a second negotiate with no preauth-integrity context, then a session setup \u2014 with no race, timing, or memory-layout dependency.\nPR:N - SMB2_SESSION_SETUP_HE is explicitly exempted from session validation in smb2_check_user_session(), and the crash occurs in generate_preauth_hash() before any credential is verified. No account or authentication on the SMB server is required.\nUI:N - The attacker drives the whole sequence by connecting to the listening ksmbd socket; no action by an administrator, local user, or SMB client is needed.\nS:U - The NULL dereference occurs in kernel context within the ksmbd connection handler and its impact is confined to the kernel's own security authority, with no crossing into a hypervisor, IOMMU, or sandbox boundary.\nC:N - The faulting access is a fixed read of offsetof(struct preauth_integrity_info, Preauth_HashValue) from a NULL pointer, which faults immediately; no data is copied out and no attacker-controlled offset exists to turn it into a disclosure primitive.\nI:N - The bug is a read-side NULL dereference in kmemdup() with no out-of-bounds or freed-object write, so no kernel memory or control-flow state can be modified.\nA:H - An unauthenticated remote client reliably triggers a kernel oops in the ksmbd worker while conn->srv_mutex is held and conn->r_count is outstanding, leaving the connection permanently stuck and the server unable to reclaim it; on kernels with panic_on_oops this is an immediate full system panic."
    }
  }
}