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Por ejemplo, si una sesi\u00f3n tiene refcount == 1 y un hilo intenta liberar esta sesi\u00f3n mediante: kref_put(&sess->refcount, destroy_session); el recuento de referencias disminuir\u00e1 y el siguiente paso ser\u00eda llamar a destroy_session(). Sin embargo, si en otro hilo, se llama a amdtee_open_session() antes de que destroy_session() haya completado la ejecuci\u00f3n, alloc_session() puede devolver 'sess' que se liberar\u00e1 m\u00e1s tarde en destroy_session(), lo que conducir\u00e1 a Use After Free en amdtee_open_session. 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{"bugzilla": {"description": "kernel: tee: amdtee: fix use-after-free vulnerability in amdtee_close_session", "id": "2267780", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2267780"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ntee: amdtee: fix use-after-free vulnerability in amdtee_close_session\nThere is a potential race condition in amdtee_close_session that may\ncause use-after-free in amdtee_open_session. For instance, if a session\nhas refcount == 1, and one thread tries to free this session via:\nkref_put(&sess->refcount, destroy_session);\nthe reference count will get decremented, and the next step would be to\ncall destroy_session(). However, if in another thread,\namdtee_open_session() is called before destroy_session() has completed\nexecution, alloc_session() may return 'sess' that will be freed up\nlater in destroy_session() leading to use-after-free in\namdtee_open_session.\nTo fix this issue, treat decrement of sess->refcount and removal of\n'sess' from session list in destroy_session() as a critical section, so\nthat it is executed atomically."], "name": "CVE-2023-52503", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-03-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-52503\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-52503\nhttps://lore.kernel.org/linux-cve-announce/2024030248-CVE-2023-52503-cb3a@gregkh/T/#u"], "threat_severity": "Low"}