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CVE-2026-74501: 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: ALSA: usb-audio: fix use-after-free in ump_to_endpoint() create_midi2_ump() registers a card-owned snd_ump_endpoint and stores a back-pointer to its per-interface snd_usb_midi2_ump object in ump->private_data, but it never installs an ump->private_free hook and never clears that pointer. If a later step of snd_usb_midi_v2_create() fails, its error path calls free_all_midi2_umps(), which kfree()s the snd_usb_midi2_ump object while the already-registered endpoint keeps pointing at it. The created /dev/snd/umpC*D* node stays exposed, so the first operation of any UMP open, ump_to_endpoint(), dereferences the dangling ump->private_data and reads rmidi->eps[dir] out of freed memory. A malicious USB MIDI 2.0 device that makes creation fail after the endpoint is registered can thus trigger a slab use-after-free read on a subsequent open of the UMP node. Clear the endpoint's back-pointer before freeing the object, and let ump_to_endpoint() tolerate a NULL private_data so the open/close/trigger callbacks fail cleanly (their callers already handle a NULL endpoint) instead of dereferencing a stale pointer. Discovered by XBOW, triaged by Baul Lee <[email protected]>

    Засегнати продукти

    • Linux Linux: ff49d1df79aef7580fe3ac99d17c3f886655d080 преди 49eccef6d6e1c00dac6fb2e7eb6f9206c33e1c37; ff49d1df79aef7580fe3ac99d17c3f886655d080 преди 8a7a33b846d6ba695891b8d0040027cdbad8cd52; ff49d1df79aef7580fe3ac99d17c3f886655d080 преди cc014ebf803174f0e5d15956dfc5a38413c945ae; ff49d1df79aef7580fe3ac99d17c3f886655d080 преди ae388c0e1bf727972096f770f82d12e4f748d1b6; ff49d1df79aef7580fe3ac99d17c3f886655d080 преди 4a05b2d1b4642df74f30b6f54843e825c4a2bfd3
    • Linux Linux: 6.5; преди 6.5; 6.6.151 до 6.6.*; 6.12.103 до 6.12.*; 6.18.44 до 6.18.*; 7.1.8 до 7.1.*; от 7.2 нататък

    История

    • 15 август 2026 Публикувано

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    Първоизточници

    CVE-2026-74501: Linux | freedomonline.bg