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CVE-2026-31581 is a use-after-free vulnerability in the Linux kernel's ALSA 6fire USB audio driver, specifically in disconnect handling within sound/usb/6fire/chip.c. The flaw occurs because the driver stores its chip structure as private data embedded in the associated snd_card allocation. During device teardown, usb6fire_chip_abort() could call snd_card_free_when_closed(); when no file descriptors were open, that call could free the sound card and the embedded chip structure synchronously. Execution then continued and performed a write through the stale chip pointer, resulting in an access to freed slab memory. The fix restructures teardown so card lifecycle handling is performed in usb6fire_chip_disconnect(): the card pointer is preserved before teardown, snd_card_disconnect() is invoked first to block new opens, URBs are aborted while the chip object is still valid, and snd_card_free_when_closed() is deferred until the end so the chip structure is never accessed after potential free.
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A Linux kernel use-after-free vulnerability in the ALSA 6fire component triggered on disconnect.
A use-after-free vulnerability in the Linux kernel ALSA 6fire USB audio driver disconnect path, where the embedded chip structure could be accessed after snd_card_free_when_closed() freed the card and private data during device teardown.
A Linux kernel use-after-free vulnerability in the ALSA 6fire driver during disconnect handling.
A Linux kernel use-after-free vulnerability in the ALSA 6fire driver during disconnect handling.
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Cross-references every affected SKU, including bundled OEM variants.
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