CVE-2026-31581
HighCVSS 7.8Summary
W jądrze systemu Linux zidentyfikowano podatność związana z użyciem po zwolnieniu pamięci w module ALSA dla urządzenia 6fire. Problem występuje w funkcji usb6fire_chip_abort(), gdzie wskaźnik do karty jest ustawiany na NULL po jej zwolnieniu, co prowadzi do dostępu do zwolnionej pamięci.
Risk Assessment
Podatność ta może prowadzić do nieprzewidywalnych zachowań systemu, w tym do awarii aplikacji lub całego systemu, co stwarza ryzyko dla stabilności i bezpieczeństwa środowiska operacyjnego.
Recommendation
Zaleca się aktualizację jądra systemu Linux do wersji, w której ta podatność została naprawiona, aby uniknąć potencjalnych problemów związanych z użyciem po zwolnieniu pamięci.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ALSA: 6fire: fix use-after-free on disconnect In usb6fire_chip_abort(), the chip struct is allocated as the card's private data (via snd_card_new with sizeof(struct sfire_chip)). When snd_card_free_when_closed() is called and no file handles are open, the card and embedded chip are freed synchronously. The subsequent chip->card = NULL write then hits freed slab memory. Call trace: usb6fire_chip_abort sound/usb/6fire/chip.c:59 [inline] usb6fire_chip_disconnect+0x348/0x358 sound/usb/6fire/chip.c:182 usb_unbind_interface+0x1a8/0x88c drivers/usb/core/driver.c:458 ... hub_event+0x1a04/0x4518 drivers/usb/core/hub.c:5953 Fix by moving the card lifecycle out of usb6fire_chip_abort() and into usb6fire_chip_disconnect(). The card pointer is saved in a local before any teardown, snd_card_disconnect() is called first to prevent new opens, URBs are aborted while chip is still valid, and snd_card_free_when_closed() is called last so chip is never accessed after the card may be freed.

