{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46195",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-46195"
  ],
  "published": "2026-05-28T09:36:53Z",
  "summary": "smb: client: validate dacloffset before building DACL pointers",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: validate dacloffset before building DACL pointers\n\nparse_sec_desc(), build_sec_desc(), and the chown path in\nid_mode_to_cifs_acl() all add the server-supplied dacloffset to pntsd\nbefore proving a DACL header fits inside the returned security\ndescriptor.\n\nOn 32-bit builds a malicious server can return dacloffset near\nU32_MAX, wrap the derived DACL pointer below end_of_acl, and then slip\npast the later pointer-based bounds checks. build_sec_desc() and\nid_mode_to_cifs_acl() can then dereference DACL fields from the wrapped\npointer in the chmod/chown rewrite paths.\n\nValidate dacloffset numerically before building any DACL pointer and\nreuse the same helper at the three DACL entry points.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-46195"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5de2665e913a10ad70aaeecf736b97276e83d995"
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    "severity": {
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      "scenario": "AV:N - The malicious data is the SMB server's security-descriptor response processed by the in-kernel CIFS client over TCP/445; a remote server (or MITM) supplies the crafted dacloffset, so the vulnerable code is reached purely via network protocol data.\nAC:L - On a 32-bit target the attacker fully controls dacloffset and thus the wrapped pointer target, reliably bypassing the bounds checks and reliably forcing a dereference (e.g. unmapped memory for a guaranteed crash); no condition outside attacker control is needed once the target is the affected architecture.\nPR:N - The attacker is the SMB server itself (or a MITM) and needs no account or privilege on the victim client; the client parses the malicious response automatically.\nUI:N - Under the reasonable compromised-server/MITM model the parse path fires during routine file access (stat/ls) on an already-mounted share, requiring no victim action at attack time.\nS:U - The corruption stays within the kernel's own memory and security authority; no crossing into another security scope (VM/IOMMU) occurs.\nC:H - The attacker-controlled wrapped pointer is an arbitrary-address read primitive; the read kernel memory influences file mode bits (observable) and is copied into the ACL returned to the server, providing a genuine disclosure channel.\nI:H - This is server-controlled memory corruption: OOB-read DACL/ACE data with attacker-influenced sizes/counts is copied into a fixed-size heap buffer in the chmod path, giving a plausible OOB-write primitive, consistent with treating memory corruption as high integrity impact.\nA:H - Dereferencing the attacker-positioned wrapped pointer (typically unmapped memory) reliably triggers a kernel oops/panic, a full denial of service."
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}