GHSA-H9QG-8GF5-6W98
Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33In the Linux kernel, the following vulnerability has been resolved:
ksmbd: fix use-after-free in same_client_has_lease()
same_client_has_lease() returns an opinfo pointer from ci->m_op_list after dropping ci->m_lock without taking a reference.
smb_grant_oplock() then dereferences that pointer in copy_lease() and when checking breaking_cnt. A concurrent close can remove the old lease from ci->m_op_list and drop the last reference before the caller uses the returned pointer, leading to a use-after-free.
Take a reference when same_client_has_lease() selects an existing lease, drop any previous match while scanning, and release the returned reference in smb_grant_oplock() after copying the lease state.
{
"affected": [],
"aliases": [
"CVE-2026-72492"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-15T06:22:23Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in same_client_has_lease()\n\nsame_client_has_lease() returns an opinfo pointer from ci-\u003em_op_list\nafter dropping ci-\u003em_lock without taking a reference.\n\nsmb_grant_oplock() then dereferences that pointer in copy_lease() and\nwhen checking breaking_cnt. A concurrent close can remove the old lease\nfrom ci-\u003em_op_list and drop the last reference before the caller uses\nthe returned pointer, leading to a use-after-free.\n\nTake a reference when same_client_has_lease() selects an existing lease,\ndrop any previous match while scanning, and release the returned\nreference in smb_grant_oplock() after copying the lease state.",
"id": "GHSA-h9qg-8gf5-6w98",
"modified": "2026-08-17T06:33:33Z",
"published": "2026-08-15T06:32:26Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72492"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/09634cd055d9bd8dd167995ea52bcd8028dd5dac"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0ff82a9cf9312678d8bc4edeef0b6e82659ac12a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/35d3d6ff2bc1e7aaecb15d5377ebbd6227acae0d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/65b655f65c3ca1ab5d598d3832bb0ff531725858"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/79c7c59bb519db6f5a2a151965e825ec725614cc"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7c3264d273d524aa6adcce23c01087271f13586f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/aaa3bb2bbf2ccbfea9e4e0b9dabf3afc60b50cd0"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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| Author | Source | Type | Date | Other |
|---|
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