io_uring/poll: fix signed comparison in io_poll_get_ownership()_CVE-2026-52933

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/poll: fix signed comparison in io_poll_get_ownership()\n\nio_poll_get_ownership() uses a signed comparison to check whether\npoll_refs has reached the threshold for the slowpath:\n\n    if (unlikely(atomic_read(&req->poll_refs) >= IO_POLL_REF_BIAS))\n\natomic_read() returns int (signed). When IO_POLL_CANCEL_FLAG\n(BIT(31)) is set in poll_refs, the value becomes negative in\nsigned arithmetic, so the >= 128 comparison always evaluates to\nfalse and the slowpath is never taken.\n\nFix this by casting the atomic_read() result to unsigned int\nbefore the comparison, so that the cancel flag is treated as a\nlarge positive value and correctly triggers the slowpath.",
    "published": "2026-06-24T07:14:24.678Z",
    "modified": "2026-06-28T06:36:54.123Z",
    "type": "cve",
    "title": "io_uring/poll: fix signed comparison in io_poll_get_ownership()",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/81bf96b0abbfa4cd47ea32e12596aed3855fb2f3\nhttps://git.kernel.org/stable/c/cf522703d4f194991615763697ae25a3f9539763\nhttps://git.kernel.org/stable/c/fc47043f3d9af3efa407665b47f8378ec691ba18\nhttps://git.kernel.org/stable/c/ea0697129807d718037f618221037aa0660ee3c5\nhttps://git.kernel.org/stable/c/c6d191164dc81838d8dbf452a6000f68c558d1ae\nhttps://git.kernel.org/stable/c/326941b22806cbf2df1fbfe902b7908b368cce42",
    "id": "CVE-2026-52933",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux a26a35e9019fd70bf3cf647dcfdae87abc7bacea\nLinux Linux a26a35e9019fd70bf3cf647dcfdae87abc7bacea\nLinux Linux a26a35e9019fd70bf3cf647dcfdae87abc7bacea\nLinux Linux a26a35e9019fd70bf3cf647dcfdae87abc7bacea\nLinux Linux a26a35e9019fd70bf3cf647dcfdae87abc7bacea\nLinux Linux a26a35e9019fd70bf3cf647dcfdae87abc7bacea\nLinux Linux 4b702b7d11ce1b9d26fc6d7c5a7ef4ac1d455048\nLinux Linux bc4e6ee16778149811333a969a7a893d4cc110c5\nLinux Linux 5.15.82\nLinux Linux 6.0.11\nLinux Linux 6.1",
    "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": "",
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        "baseScore": 0,
        "baseSeverity": "",
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        "attackComplexity": "",
        "privilegesRequired": "",
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        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "a26a35e9019fd70bf3cf647dcfdae87abc7bacea",
    "vendor": "Linux",
    "ai_description": "",
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    "ai_score": 0
}