GHSA-H4WV-R484-2RG5
Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix overflow in passthrough ioctl bounds check
smb2_ioctl_query_info() validates the PASSTHRU_FSCTL response payload before copying it to userspace.
The payload offset and length both come from 32-bit fields. The bounds check currently adds OutputOffset and qi.input_buffer_length directly, so the addition can wrap in 32-bit arithmetic before the result is compared against the response buffer length.
A malicious server can use a large OutputOffset and a small OutputCount to make the wrapped sum pass the bounds check. The later copy_to_user() then reads from io_rsp + OutputOffset, outside the response buffer.
Use size_add() for the offset plus length check so overflow is treated as out of bounds.
{
"affected": [],
"aliases": [
"CVE-2026-72310"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-15T06:22:03Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix overflow in passthrough ioctl bounds check\n\nsmb2_ioctl_query_info() validates the PASSTHRU_FSCTL response payload\nbefore copying it to userspace.\n\nThe payload offset and length both come from 32-bit fields. The bounds\ncheck currently adds OutputOffset and qi.input_buffer_length directly, so\nthe addition can wrap in 32-bit arithmetic before the result is compared\nagainst the response buffer length.\n\nA malicious server can use a large OutputOffset and a small OutputCount\nto make the wrapped sum pass the bounds check. The later copy_to_user()\nthen reads from io_rsp + OutputOffset, outside the response buffer.\n\nUse size_add() for the offset plus length check so overflow is treated as\nout of bounds.",
"id": "GHSA-h4wv-r484-2rg5",
"modified": "2026-08-17T06:33:22Z",
"published": "2026-08-15T06:32:20Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72310"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/160045fc943f6c46b227644261252c8a22b8a87a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1627e7d5c9b09721a141d07cedb178882f1ded67"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/175357ee0c596cb82054650dfa32fda51ad35aaa"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/63feb687e89a3a52a31e6e01764117cc500f1974"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a4f27ad055392fa164f5649e89a3637b033c5fcc"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b30771b69eafae750afb7385fbcc3d77ed3f3670"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dbd126539c098dba3159ce7d34b10b2daddcbd0f"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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