ksmbd: fix use-after-free by using call_rcu() for oplock_info_CVE-2026-43376

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free by using call_rcu() for oplock_info\n\nksmbd currently frees oplock_info immediately using kfree(), even\nthough it is accessed under RCU read-side critical sections in places\nlike opinfo_get() and proc_show_files().\n\nSince there is no RCU grace period delay between nullifying the pointer\nand freeing the memory, a reader can still access oplock_info\nstructure after it has been freed. This can leads to a use-after-free\nespecially in opinfo_get() where atomic_inc_not_zero() is called on\nalready freed memory.\n\nFix this by switching to deferred freeing using call_rcu().",
    "published": "2026-05-08T14:21:25.854Z",
    "modified": "2026-05-11T06:33:55.017Z",
    "type": "cve",
    "title": "ksmbd: fix use-after-free by using call_rcu() for oplock_info",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/302fef75512b2c8329a3f5efab1ae7ba2562387a\nhttps://git.kernel.org/stable/c/08aa9f3c8cf4d0bee44df540dfe34e8d64069f2c\nhttps://git.kernel.org/stable/c/1d6abf145615dbfe267ce3b0a271f95e3780e18e\nhttps://git.kernel.org/stable/c/ce8507ee82c888126d8e7565e27c016308d24cde\nhttps://git.kernel.org/stable/c/1dfd062caa165ec9d7ee0823087930f3ab8a6294",
    "id": "CVE-2026-43376",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 296cb5457cc6f4a754c4ae29855f8a253d52bcc6\nLinux Linux d54ab1520d43e95f9b2e22d7a05fc9614192e5a5\nLinux Linux 18b4fac5ef17f77fed9417d22210ceafd6525fc7\nLinux Linux 18b4fac5ef17f77fed9417d22210ceafd6525fc7\nLinux Linux 18b4fac5ef17f77fed9417d22210ceafd6525fc7\nLinux Linux d73686367ad68534257cd88a36ca3c52cb8b81d8\nLinux Linux 6.15",
    "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": "",
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        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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            "privilegesRequired": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "296cb5457cc6f4a754c4ae29855f8a253d52bcc6",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
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    "ai_score": 0
}