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CVE-2026-68456: Linux

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    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: usb: atm: ueagle-atm: wait for pre-firmware load in .disconnect() ueagle-atm uses the asynchronous request_firmware_nowait() in .probe(), but does not wait for its completion, not even in .disconnect(); so, if the device is unplugged meanwhile, its teardown runs concurrently with that. Even though this inconsistency is worth addressing on its own, it has also triggered several bug reports in syzbot over the years (some auto-closed) where the firmware sysfs fallback mechanism (CONFIG_FW_LOADER_USER_HELPER) creates a firmware subdirectory in the device directory during its removal, which might hit unexpected conditions in kernfs, apparently, depending at which point the add and remove operations raced. (See links.) The pattern is: usb ?-?: Direct firmware load for ueagle-atm/eagle?.fw failed with error -2 usb ?-?: Falling back to sysfs fallback for: ueagle-atm/eagle?.fw <ERROR> Call trace: ... kernfs_create_dir_ns sysfs_create_dir_ns create_dir kobject_add_internal kobject_add_varg kobject_add class_dir_create_and_add get_device_parent device_add fw_load_sysfs_fallback fw_load_from_user_helper firmware_fallback_sysfs _request_firmware request_firmware_work_func ... (Some variations are observed, after fw_load_sysfs_fallback(), e.g., [1].) While the kernfs side is being looked at, the ueagle-atm side can be fixed by waiting for the pre-firmware load in the .disconnect() handler. This change has a similar approach to previous work by Andrey Tsygunka [2] (wait_for_completion() in .disconnect()), but it is relatively different in design/implementation; using the Originally-by tag for credit assignment. This has been tested with: - synthetic reproducer to check the error path; - USB gadget (virtual device) to check the firmware upload path; - QEMU device emulator to check the device ID re-enumeration path; (The latter two were written by Claude; no other code/text in this commit.)

    Засегнати продукти

    • Linux Linux: b72458a80c75cab832248f536412f386e20a93a0 преди d85f19aaef42a03e3e4765d659c761c8750a7f23; b72458a80c75cab832248f536412f386e20a93a0 преди 76861031b43a18065d13f9ffb8595d25c7576005; b72458a80c75cab832248f536412f386e20a93a0 преди bbfedc84714064ea4845e6b76f96316eb5bb65d8; b72458a80c75cab832248f536412f386e20a93a0 преди f2a6abc670104fc3e383ee3b1cf35c070485e3df; b72458a80c75cab832248f536412f386e20a93a0 преди c581e30ae5b332d8acef64475a211b3f82099941; b72458a80c75cab832248f536412f386e20a93a0 преди 509b51327320bdeaef1969248177a446ded073ab; b72458a80c75cab832248f536412f386e20a93a0 преди ddcdac47e1f2651c7be60e299f98faf981522797; b72458a80c75cab832248f536412f386e20a93a0 преди e2674dfbed8a30d57e2bc872c4bfa6c3eec918bf
    • Linux Linux: 2.6.16; преди 2.6.16; 5.10.261 до 5.10.*; 5.15.212 до 5.15.*; 6.1.178 до 6.1.*; 6.6.145 до 6.6.*; 6.12.97 до 6.12.*; 6.18.40 до 6.18.*; 7.1.5 до 7.1.*; от 7.2 нататък

    История

    • 15 август 2026 Публикувано

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    CVE-2026-68456: Linux | freedomonline.bg