{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31432",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-31432"
  ],
  "published": "2026-04-22T08:17:36Z",
  "summary": "ksmbd: fix OOB write in QUERY_INFO for compound requests",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix OOB write in QUERY_INFO for compound requests\n\nWhen a compound request such as READ + QUERY_INFO(Security) is received,\nand the first command (READ) consumes most of the response buffer,\nksmbd could write beyond the allocated buffer while building a security\ndescriptor.\n\nThe root cause was that smb2_get_info_sec() checked buffer space using\nppntsd_size from xattr, while build_sec_desc() often synthesized a\nsignificantly larger descriptor from POSIX ACLs.\n\nThis patch introduces smb_acl_sec_desc_scratch_len() to accurately\ncompute the final descriptor size beforehand, performs proper buffer\nchecking with smb2_calc_max_out_buf_len(), and uses exact-sized\nallocation + iov pinning.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31432"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/850452af77f55d185f9445e1f7a1db53c5e4aad4"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
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      "scenario": "AV:N - ksmbd is the in-kernel SMB server listening on TCP/445, directly reachable over the network by any remote SMB client.\nAC:L - The attacker reliably triggers the OOB write by crafting a compound request (e.g., READ + QUERY_INFO(Security)) where the first command consumes most of the response buffer. No race condition or special conditions are needed.\nPR:L - The QUERY_INFO command requires a valid SMB session (checked by smb2_check_user_session), a tree connect, and an open file handle. Even guest access requires completing session setup, so low privileges are needed.\nUI:N - No user interaction is required; the attacker sends the compound request directly to the ksmbd server.\nS:U - The vulnerability results in kernel heap corruption within the same security authority (the kernel); no security boundary such as a VM or sandbox is crossed.\nC:H - The heap buffer overflow writes past the kvzalloc'd response buffer into adjacent kernel heap objects. This OOB write can be leveraged to corrupt adjacent structures and create information disclosure primitives.\nI:H - The OOB write corrupts kernel heap memory with attacker-influenced data (security descriptor content including SIDs and ACEs derived from file ACLs), enabling potential control flow hijacking or arbitrary write primitives.\nA:H - The heap buffer overflow corrupts adjacent kernel data structures, reliably causing kernel crashes or panics."
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}