{
  "cveId": "CVE-2026-46139",
  "url": "https://patchblox.com/security/cve/CVE-2026-46139",
  "summary": "CVE-2026-46139 is fixed in 37 products on 1 platform, first by ALAS2023-2026-1753, released May 25, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  smb: client: use kzalloc to zero-initialize secu...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  smb: client: use kzalloc to zero-initialize security descriptor buffer  Commit 62e7dd0a39c2d (\u0022smb: common: change the data type of num_aces to le16\u0022) split struct smb_acl\u0027s __le32 num_aces field into __le16 num_aces and __le16 reserved. The reserved field corresponds to Sbz2 in the MS-DTYP ACL wire format, which must be zero [1].  When building an ACL descriptor in build_sec_desc(), we are using a kmalloc()\u0027ed descriptor buffer and writing the fields explicitly using le16() writes now. This never writes to the 2 byte reserved field, leaving it as uninitialized heap data.  When the reserved field happens to contain non-zero slab garbage, Samba rejects the security descriptor with \u0022ndr_pull_security_descriptor failed: Range Error\u0022, causing chmod to fail with EINVAL.  Change kmalloc() to kzalloc() to ensure the entire buffer is zero-initialized.   [1] https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-dtyp/20233ed8-a6c6-4097-aafa-dd545ed24428",
  "published": "2026-05-25T09:00:00Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00122,
  "epssPercentile": 0.01984,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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      "fix": "ALAS2023-2026-1753",
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      "released": "2026-05-25T09:00:00Z"
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      "fix": "ALAS2023-2026-1754",
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  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}