ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()_CVE-2026-43379

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()\n\nopinfo pointer obtained via rcu_dereference(fp->f_opinfo) is being\naccessed after rcu_read_unlock() has been called. This creates a\nrace condition where the memory could be freed by a concurrent\nwriter between the unlock and the subsequent pointer dereferences\n(opinfo->is_lease, etc.), leading to a use-after-free.",
    "published": "2026-05-08T14:21:28.027Z",
    "modified": "2026-05-11T06:33:59.239Z",
    "type": "cve",
    "title": "ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/bf4d66d72e4a9e268c1012c331ce9eaedb5e2086\nhttps://git.kernel.org/stable/c/960699317d39f46611f4ebeb69edc567c1f4e6b6\nhttps://git.kernel.org/stable/c/dbbd328cf58261ca239756fe1c0d10c9518d3399\nhttps://git.kernel.org/stable/c/b3568347c51c46e2cabc356bc34676df98296619\nhttps://git.kernel.org/stable/c/eac3361e3d5dd8067b3258c69615888eb45e9f25",
    "id": "CVE-2026-43379",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 27b40b7bfcd121fe13a150ffe11957630cf49246\nLinux Linux 5fb282ba4fef8985a5acf2b32681f2ec07732561\nLinux Linux 5fb282ba4fef8985a5acf2b32681f2ec07732561\nLinux Linux 5fb282ba4fef8985a5acf2b32681f2ec07732561\nLinux Linux 5fb282ba4fef8985a5acf2b32681f2ec07732561\nLinux Linux 6.9",
    "sourceHref": "",
    "cvss": {
        "score": 9.8,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
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            "privilegesRequired": "",
            "userInteraction": "",
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            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "27b40b7bfcd121fe13a150ffe11957630cf49246",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}