sched_ext: Remove redundant css_put() in scx_cgroup_init()_CVE-2026-43438

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched_ext: Remove redundant css_put() in scx_cgroup_init()\n\nThe iterator css_for_each_descendant_pre() walks the cgroup hierarchy\nunder cgroup_lock(). It does not increment the reference counts on\nyielded css structs.\n\nAccording to the cgroup documentation, css_put() should only be used\nto release a reference obtained via css_get() or css_tryget_online().\nSince the iterator does not use either of these to acquire a reference,\ncalling css_put() in the error path of scx_cgroup_init() causes a\nrefcount underflow.\n\nRemove the unbalanced css_put() to prevent a potential Use-After-Free\n(UAF) vulnerability.",
    "published": "2026-05-08T14:22:07.980Z",
    "modified": "2026-05-11T06:34:30.129Z",
    "type": "cve",
    "title": "sched_ext: Remove redundant css_put() in scx_cgroup_init()",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/cc095cd305fddbe25a968e4a78436ff9476cf0f6\nhttps://git.kernel.org/stable/c/6eaaa67d6998f6c30c462b140db8c062e07ec473\nhttps://git.kernel.org/stable/c/bf50f3285eda8a0173625fcdb5f183f96e1008cd\nhttps://git.kernel.org/stable/c/1336b579f6079fb8520be03624fcd9ba443c930b",
    "id": "CVE-2026-43438",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 8195136669661fdfe54e9a8923c33b31c92fc1da\nLinux Linux 8195136669661fdfe54e9a8923c33b31c92fc1da\nLinux Linux 8195136669661fdfe54e9a8923c33b31c92fc1da\nLinux Linux 8195136669661fdfe54e9a8923c33b31c92fc1da\nLinux Linux 6.12",
    "sourceHref": "",
    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/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": "",
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            "privilegesRequired": "",
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            "confidentialityImpact": "",
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            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "8195136669661fdfe54e9a8923c33b31c92fc1da",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
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    "ai_score": 0
}