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CVE-2026-98773: 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: cdc-acm: skip URB restart in port_shutdown if disconnected acm_port_shutdown() is called from the tty-port machinery whenever the last user closes the port. acm_disconnect() sets acm->disconnected and calls tty_port_tty_vhangup(), which eventually triggers port_shutdown(). At that point acm_disconnect() has already called acm_poison_urbs() and is about to free the control and read URBs. However, acm_port_shutdown() unconditionally calls acm_unpoison_urbs() and, when the ALWAYS_POLL_CTRL quirk is set, immediately re-submits the ctrlurb and all read URBs. If the concurrent acm_disconnect() then frees those URBs and their DMA buffers while they are in-flight, the result is a use-after-free in acm_ctrl_irq() or acm_read_bulk_callback() accessing the freed DMA memory. Fix by checking acm->disconnected after draining the delayed anchor and returning early: if we are in a disconnect path the URBs must remain poisoned and must not be resubmitted. The early return is placed after the delayed-anchor drain loop because that loop only cancels write-side accounting (wb->use = false and autopm counter) and does not touch the hardware path.

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    • Linux Linux: d826061aa64cb28089bf4c73e301dd7928662b84 преди d97da42e9de577dc827d4e8866e6971deefe2d9c; 8fb82e3555a7d56a05d8ef0edee9859f889c0860 преди d86775e79838d7d2e38ccf506a7d0f8e2dd4d5d0; 603d5a7110832e10165d21f9a1486399457177de преди 9742905d9ed5bf23ebe4c100dec80b6bc50fb522; 5d29d7ff8679e5a525f22da467ba33c042e8029b преди a0ed07b5bbb2d8fcef86810453216070691816e7; f58752ebcb35e156c85cd1a82d6579c7af3b9023 преди 420ca35af891d33522cc08504768ccd60a4c450a; f58752ebcb35e156c85cd1a82d6579c7af3b9023 преди dc614d6bc991740d41d5a99ac7765c4b675dda88; 283f8162cc3c82086537cbc7dc01870dbeb07a91; f77f10bc76c2da86b4248269472f6d971e37828b; 6.1.175 преди 6.1.191; 6.6.136 преди 6.6.160; 6.12.83 преди 6.12.113; 6.18.24 преди 6.18.56; 6.19.14 преди 6.20; 7.0.1 преди 7.1
    • Linux Linux: 7.1; преди 7.1; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.113 до 6.12.*; 6.18.56 до 6.18.*; 7.2.10 до 7.2.*; от 7.3 нататък

    История

    • 18 октомври 2026 Публикувано

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    CVE-2026-98773: Linux | freedomonline.bg