GHSA-76F2-J4C3-M5V4
Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-27 06:30In the Linux kernel, the following vulnerability has been resolved:
ksmbd: serialize QUERY_DIRECTORY requests per file
smb2_query_dir() stores a pointer to its stack-allocated private data in the ksmbd_file readdir_data. Concurrent QUERY_DIRECTORY requests using the same file handle can overwrite this pointer while an iterate_dir() callback is still using it, resulting in a stack use-after-free.
Add a per-file mutex and hold it while accessing the shared directory enumeration state. The lock covers scan restart, dot entry state, readdir_data setup and iteration, and response construction. This prevents another request from replacing readdir_data.private before the current request has finished using it and also serializes the shared file position.
{
"affected": [],
"aliases": [
"CVE-2026-64397"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-07-25T10:17:23Z",
"severity": "CRITICAL"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: serialize QUERY_DIRECTORY requests per file\n\nsmb2_query_dir() stores a pointer to its stack-allocated private data in\nthe ksmbd_file readdir_data. Concurrent QUERY_DIRECTORY requests using the\nsame file handle can overwrite this pointer while an iterate_dir() callback\nis still using it, resulting in a stack use-after-free.\n\nAdd a per-file mutex and hold it while accessing the shared directory\nenumeration state. The lock covers scan restart, dot entry state,\nreaddir_data setup and iteration, and response construction. This prevents\nanother request from replacing readdir_data.private before the current\nrequest has finished using it and also serializes the shared file position.",
"id": "GHSA-76f2-j4c3-m5v4",
"modified": "2026-07-27T06:30:36Z",
"published": "2026-07-25T12:31:34Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64397"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1426fd79102539bc0ab5c8fced047ad4313b9908"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2a64dbf9c739ddf7a25a066507597bf89f8f73d2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/64dac2d486ec1eb18dc00968b16a230b6b75ec24"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a1d5d31cad593ea5e1b637f2f39c9ef6d09d1199"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/be6d26bf27499977c746abc163659915082348d8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fd22b039a5a05bc1d6818e9dcd1001fb432a829d"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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