{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31709",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-31709"
  ],
  "published": "2026-05-01T13:56:32Z",
  "summary": "smb: client: validate the whole DACL before rewriting it in cifsacl",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: validate the whole DACL before rewriting it in cifsacl\n\nbuild_sec_desc() and id_mode_to_cifs_acl() derive a DACL pointer from a\nserver-supplied dacloffset and then use the incoming ACL to rebuild the\nchmod/chown security descriptor.\n\nThe original fix only checked that the struct smb_acl header fits before\nreading dacl_ptr->size or dacl_ptr->num_aces.  That avoids the immediate\nheader-field OOB read, but the rewrite helpers still walk ACEs based on\npdacl->num_aces with no structural validation of the incoming DACL body.\n\nA malicious server can return a truncated DACL that still contains a\nheader, claims one or more ACEs, and then drive\nreplace_sids_and_copy_aces() or set_chmod_dacl() past the validated\nextent while they compare or copy attacker-controlled ACEs.\n\nFactor the DACL structural checks into validate_dacl(), extend them to\nvalidate each ACE against the DACL bounds, and use the shared validator\nbefore the chmod/chown rebuild paths.  parse_dacl() reuses the same\nvalidator so the read-side parser and write-side rewrite paths agree on\nwhat constitutes a well-formed incoming DACL.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
    }
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31709"
    },
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      "url": "https://git.kernel.org/stable/c/b8603d9ae6c9087662b098619996bc4a8064319d"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - The vulnerable DACL is supplied by an SMB server over network SMB/CIFS ACL query responses and parsed by the Linux SMB client in kernel context. A malicious or compromised SMB server can deliver the crafted security descriptor over TCP.\nAC:L - After the client reaches the CIFS ACL path, the attacker controls the DACL offsets, sizes, ACE count, and ACE bytes in the server response. There is no race or condition outside attacker control needed to trigger the malformed ACE walk.\nPR:N - The attacker needs no privileges on the victim system; they only need to act as or control the SMB server that the client uses. Local chmod/chown permission checks apply to the victim-side process, not to the remote attacker.\nUI:R - Exploitation requires the victim system or an automated victim workflow to mount/use the SMB share and issue metadata operations such as stat, chmod, chown, or chgrp. The server cannot trigger this parser without a client request.\nS:U - The vulnerable component and the impacted resource are the same Linux kernel security authority on the SMB client. This is not a VM escape, IOMMU bypass, or cross-authority boundary violation.\nC:H - The malformed DACL can drive out-of-bounds reads while copying ACE/SID data, and rewritten ACL data can be sent back to the malicious server. Under the required high-severity tie-break rule, this is treated as high confidentiality impact.\nI:H - The chown/chgrp rewrite path can copy attacker-influenced ACEs into a newly allocated security descriptor beyond the size derived from the declared DACL, creating kernel heap memory corruption. Such corruption is potentially exploitable for arbitrary write or code execution.\nA:H - Malformed server-controlled ACL structures can drive out-of-bounds kernel memory access during ACL parsing or rewriting. Even without full exploitation, this can crash or oops the kernel."
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}