{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89792",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89792"
  ],
  "published": "2026-09-16T08:48:24Z",
  "summary": "ksmbd: prevent out-of-bounds reads in share config responses",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: prevent out-of-bounds reads in share config responses\n\nValidate IPC share configuration payload sizes before consuming\nvariable-length fields. Bound veto list parsing and account for\nthe separator byte when deriving the path length.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89792"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/df8aa4a09733c4d3974b1db32c1782b3aad3a151"
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      "url": "https://git.kernel.org/stable/c/cd2bcee450bc94770be56c0b896c1a1dc6838bd8"
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-03T11:04:09Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Malformed payload_sz/veto_list_sz and unterminated veto/path bytes are consumed from a ksmbd generic-netlink SHARE_CONFIG_RESPONSE (handle_generic_event \u2192 ipc_validate_msg \u2192 share_config_request), not from SMB PDUs. A remote TREE_CONNECT only creates the pending IPC request; the attacker must be local to inject or control that response.\nAC:L - The attacker fully controls the crafted netlink length fields and can set payload_sz to 0 or omit NULs so the old checks pass. Pending handles come from a small IDA and can be brute-forced against a TREE_CONNECT the attacker also triggers; no victim timing or rare config is required.\nPR:L - handle_generic_event requires CAP_NET_ADMIN only when CONFIG_SMB_SERVER_CHECK_CAP_NET_ADMIN is set; SMBD_GENL is netns-aware, has no GENL_ADMIN_PERM, and does not bind responses to ksmbd_tools_pid. That capability is Low, and builds that disable the check allow any local user to send the message.\nUI:N - The attacker sends the malformed SHARE_CONFIG_RESPONSE and can issue the matching SMB2 TREE_CONNECT themselves; no separate victim or administrator action is required once ksmbd is running.\nS:U - The out-of-bounds reads and any resulting oops remain inside the ksmbd/kernel security authority on the host. This is not a VM escape, IOMMU/DMA bypass, or other cross-boundary impact.\nC:H - With payload_sz==0 the kernel kstrndup()s up to PATH_MAX bytes past the IPC object, and parse_veto_list() uses unbounded strlen()/kstrdup() when the veto buffer lacks a NUL within veto_list_sz. Those are large kernel-heap over-reads, not a few bounded bytes.\nI:N - The defects are out-of-bounds reads (strlen, kstrndup, kstrdup) into newly allocated strings; there is no out-of-bounds write or control-flow hijack primitive. A local IPC sender can already supply a well-formed share path without this bug.\nA:H - Walking strlen() or kstrndup(..., PATH_MAX) off the end of the IPC slab into unmapped memory oopses the ksmbd worker. The attacker can repeat the crafted response against further TREE_CONNECT-triggered requests and crash the kernel at will."
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}