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CVE-2026-31726: Linux

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CVSS

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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Атакува се

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Време до експлоатация

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: usb: gadget: uvc: fix NULL pointer dereference during unbind race Commit b81ac4395bbe ("usb: gadget: uvc: allow for application to cleanly shutdown") introduced two stages of synchronization waits totaling 1500ms in uvc_function_unbind() to prevent several types of kernel panics. However, this timing-based approach is insufficient during power management (PM) transitions. When the PM subsystem starts freezing user space processes, the wait_event_interruptible_timeout() is aborted early, which allows the unbind thread to proceed and nullify the gadget pointer (cdev->gadget = NULL): [ 814.123447][ T947] configfs-gadget.g1 gadget.0: uvc: uvc_function_unbind() [ 814.178583][ T3173] PM: suspend entry (deep) [ 814.192487][ T3173] Freezing user space processes [ 814.197668][ T947] configfs-gadget.g1 gadget.0: uvc: uvc_function_unbind no clean disconnect, wait for release When the PM subsystem resumes or aborts the suspend and tasks are restarted, the V4L2 release path is executed and attempts to access the already nullified gadget pointer, triggering a kernel panic: [ 814.292597][ C0] PM: pm_system_irq_wakeup: 479 triggered dhdpcie_host_wake [ 814.386727][ T3173] Restarting tasks ... [ 814.403522][ T4558] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000030 [ 814.404021][ T4558] pc : usb_gadget_deactivate+0x14/0xf4 [ 814.404031][ T4558] lr : usb_function_deactivate+0x54/0x94 [ 814.404078][ T4558] Call trace: [ 814.404080][ T4558] usb_gadget_deactivate+0x14/0xf4 [ 814.404083][ T4558] usb_function_deactivate+0x54/0x94 [ 814.404087][ T4558] uvc_function_disconnect+0x1c/0x5c [ 814.404092][ T4558] uvc_v4l2_release+0x44/0xac [ 814.404095][ T4558] v4l2_release+0xcc/0x130 Address the race condition and NULL pointer dereference by: 1. State Synchronization (flag + mutex) Introduce a 'func_unbound' flag in struct uvc_device. This allows uvc_function_di

    Засегнати продукти

    • Linux Linux: 1444e0568bc2c70868e7b8da5b46fc2252acc3f5 преди 0c00ec409d7b2bce3fcac73188b79a141db7cfda; 4962e5a2f301d24953f17d6748d986e21566abe1 преди d92d1532e05b1b31d36d48765e43bf73d793d19f; b81ac4395bbeaf36e078dea1a48c02dd97b76235 преди 0587de744615628c38e33ddc1601160a5ea8c50a; b81ac4395bbeaf36e078dea1a48c02dd97b76235 преди c78e463ee134b4669579d453c81ae00795e4c19a; b81ac4395bbeaf36e078dea1a48c02dd97b76235 преди 8a1128d604c360eca135f15b882b70256a522145; b81ac4395bbeaf36e078dea1a48c02dd97b76235 преди 1aa9356881ee4ed414bf72d0c56d915492cb5345; b81ac4395bbeaf36e078dea1a48c02dd97b76235 преди c038ba56b92e410d1caec22b2dc68780a0b42091; b81ac4395bbeaf36e078dea1a48c02dd97b76235 преди eba2936bbe6b752a31725a9eb5c674ecbf21ee7d; e10735ce87502b07e171727e574afdd6c0890a08; 5.10.117 преди 5.10.253; 5.15.41 преди 5.15.203; 5.17.9 преди 5.18
    • Linux Linux: 5.18; преди 5.18; 5.10.253 до 5.10.*; 5.15.203 до 5.15.*; 6.1.168 до 6.1.*; 6.6.134 до 6.6.*; 6.12.81 до 6.12.*; 6.18.22 до 6.18.*; 6.19.12 до 6.19.*; от 7.0 нататък

    История

    • 1 май 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-31726: Linux | freedomonline.bg