tee: optee: prevent use-after-free when the client exits before the supplicant_CVE-2026-53273

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\ntee: optee: prevent use-after-free when the client exits before the supplicant\n\nCommit 70b0d6b0a199 (\"tee: optee: Fix supplicant wait loop\") made the\nclient wait as killable so it can be interrupted during shutdown or\nafter a supplicant crash. This changes the original lifetime expectations:\nthe client task can now terminate while the supplicant is still processing\nits request.\n\nIf the client exits first it removes the request from its queue and\nkfree()s it, while the request ID remains in supp->idr. A subsequent\nlookup on the supplicant path then dereferences freed memory, leading to\na use-after-free.\n\nSerialise access to the request with supp->mutex:\n\n  * Hold supp->mutex in optee_supp_recv() and optee_supp_send() while\n    looking up and touching the request.\n  * Let optee_supp_thrd_req() notice that the client has terminated and\n    signal optee_supp_send() accordingly.\n\nWith these changes the request cannot be freed while the supplicant still\nhas a reference, eliminating the race.",
    "published": "2026-06-25T08:39:57.811Z",
    "modified": "2026-06-28T06:41:16.151Z",
    "type": "cve",
    "title": "tee: optee: prevent use-after-free when the client exits before the supplicant",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/416259cb5bffecaaae5f76539deb535a8c1b2c34\nhttps://git.kernel.org/stable/c/724d0caffd4204b46f78efe22f18f8338031c6e1\nhttps://git.kernel.org/stable/c/ae847ab29ded2d7cece4d5970f0edefa4137bf2f\nhttps://git.kernel.org/stable/c/9a0dc9279d0907b198f205a693aedf696b08145d\nhttps://git.kernel.org/stable/c/d366a01475f927402c96a3fe78bfc06b924fc87d\nhttps://git.kernel.org/stable/c/d5b57bb314d79e99bebb58a53588fa11dd4dbf69\nhttps://git.kernel.org/stable/c/373152c94e57e9592b68c100e224fbd943cfd608\nhttps://git.kernel.org/stable/c/387a926ee166814611acecb960207fe2f3c4fd3e",
    "id": "CVE-2026-53273",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 0180cf0373f84fff61b16f8c062553a13dd7cfca\nLinux Linux c0a9a948159153be145f9471435695373904ee6d\nLinux Linux ec18520f5edc20a00c34a8c9fdd6507c355e880f\nLinux Linux d61cc1a435e6894bfb0dd3370c6f765d2d12825d\nLinux Linux fd9d2d6124c293e40797a080adf8a9c237efd8b8\nLinux Linux 70b0d6b0a199c5a3ee6c72f5e61681ed6f759612\nLinux Linux 70b0d6b0a199c5a3ee6c72f5e61681ed6f759612\nLinux Linux 70b0d6b0a199c5a3ee6c72f5e61681ed6f759612\nLinux Linux 3eb4911364c764572e9db4ab900a57689a54e8ce\nLinux Linux 21234efe2a8474a6d2d01ea9573319de7858ce44\nLinux Linux 5.10.235\nLinux Linux 5.15.179\nLinux Linux 6.1.130\nLinux Linux 6.6.80\nLinux Linux 6.12.17\nLinux Linux 5.4.291\nLinux Linux 6.13.5\nLinux Linux 6.14",
    "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": [],
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        "baseScore": 0,
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        "privilegesRequired": "",
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        "scope": "",
        "confidentialityImpact": "",
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        "availabilityImpact": "",
        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "0180cf0373f84fff61b16f8c062553a13dd7cfca",
    "vendor": "Linux",
    "ai_description": "",
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    "ai_score": 0
}