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CVE-2026-80854: Linux

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CVSS

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_tcm: keep port count until LUN teardown completes tcm_usbg_drop_nexus() permits session removal once tpg_port_count reaches zero. However, usbg_port_unlink() currently decrements that count from the fabric_pre_unlink() callback, before core_dev_del_lun() waits for active se_lun references to drain. If removal of the last LUN races a nexus removal, the latter can observe a zero port count and call target_remove_session(). This frees sess_cmd_map while an in-flight struct usbg_cmd, including its work item, can still be accessed. Overlapping the last-LUN unlink with nexus removal reproduces this lifetime violation as a DEBUG_OBJECTS "free active" warning for usbg_cmd_work, followed by a target-core BUG/Oops. The generic target-core unlink path has no callback after core_dev_del_lun() completes. Add an optional fabric_post_unlink() callback and use it for the f_tcm port count. The count now remains nonzero until core_dev_del_lun() has finished draining active LUN references, preventing nexus removal from freeing the session during command completion.

    Засегнати продукти

    • Linux Linux: c52661d60f636d17e26ad834457db333bd1df494 преди c494c5562ca69b61a82f566e3b87a445d2c28929; c52661d60f636d17e26ad834457db333bd1df494 преди c1f359d9a5efed458946063de65ddbeaacc4f165; c52661d60f636d17e26ad834457db333bd1df494 преди 178f59a0bccd3f66cdfa5184310f31a58b7257c4; c52661d60f636d17e26ad834457db333bd1df494 преди ad6f0375d2e93a1d8c015463e5e92dfcb26e311b; c52661d60f636d17e26ad834457db333bd1df494 преди 2efbfd42441d3ef8137aff2d59e9835e1d5ae780; c52661d60f636d17e26ad834457db333bd1df494 преди 85aa61fedcb4eb13f3dc5db73f6dc359f41f5d95; c52661d60f636d17e26ad834457db333bd1df494 преди bbd6aa311a9f4dd17822c7557451458d3d2e980b; c52661d60f636d17e26ad834457db333bd1df494 преди eaa96a8458f54d6cf0954242ab8b1df2a6fccafa; c52661d60f636d17e26ad834457db333bd1df494 преди c39d0916da47d94909391876c9e5bd429ea7b1b9
    • Linux Linux: 3.5; преди 3.5; 5.10.269 до 5.10.*; 5.15.220 до 5.15.*; 6.1.187 до 6.1.*; 6.6.156 до 6.6.*; 6.12.108 до 6.12.*; 6.18.49 до 6.18.*; 7.1.13 до 7.1.*; 7.2.3 до 7.2.*; 7.3 до *

    История

    • 4 септември 2026 Публикувано

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    Първоизточници

    CVE-2026-80854: Linux | freedomonline.bg