{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2023-53399",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2023-53399"
  ],
  "published": "2025-09-18T13:36:23Z",
  "summary": "ksmbd: fix NULL pointer dereference in smb2_get_info_filesystem()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix NULL pointer dereference in smb2_get_info_filesystem()\n\nIf share is , share->path is NULL and it cause NULL pointer\ndereference issue.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.21-1+rpt1"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v6",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v7",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v7l",
            "binary_version": "1:6.1.21-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi1-rpi-v8",
            "binary_version": "1:6.1.21-1+rpt1"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.21-1+rpt1": {
            "linux_commit": "0afb5e98488aed7017b9bf321b575d0177feb7ed",
            "upstream_version": "6.1.21",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.28"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-53399"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/227eb2689b44d0d60da3839b146983e73435924c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a70751dd7b60eab025e97e19b6b2477c6eaf2bbb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b35f6c031b87d9e51f141ff6de0ea59756a8e313"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1636e09779f83e10e6ed57d91ef94abcefdd206b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3ac00a2ab69b34189942afa9e862d5170cdcb018"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:24:39Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - ksmbd is the in-kernel SMB server; the bug is reached by sending SMB2_QUERY_INFO over TCP/445 after tree-connecting to IPC$, so a remote network peer triggers it with no local access.\nAC:L - The attacker simply tree-connects to the IPC$ pipe share and issues SMB2_QUERY_INFO with InfoType=SMB2_O_INFO_FILESYSTEM; share->path is always NULL for KSMBD_SHARE_FLAG_PIPE shares, so the NULL deref is deterministic with no race or uncontrolled precondition.\nPR:N - IPC$ is the classic SMB null-session target, and ksmbd's commonly shipped map-to-guest configuration lets an unauthenticated client obtain a guest session, tree-connect IPC$, and reach smb2_get_info_filesystem() without valid credentials.\nUI:N - The attacker drives negotiate, session setup, IPC$ tree connect, and QUERY_INFO entirely from its own SMB client; no victim or administrator action is required beyond ksmbd already listening.\nS:U - The NULL dereference oops/panic affects only the host kernel running ksmbd and does not cross a VM, IOMMU, or other security-authority boundary.\nC:N - This is a pure NULL pointer dereference in getname_kernel()/strlen on share->path; no out-of-bounds read or other disclosure primitive is obtained.\nI:N - The fault is a read of address 0 with no memory write, type confusion, or control-flow hijack path beyond the ensuing oops.\nA:H - Dereferencing the NULL share->path causes a kernel oops/panic in the ksmbd worker (as shown by the KASAN null-ptr-deref report), which is a full availability impact that a remote attacker can repeat at will."
    }
  }
}