CVE-2026-23089

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ALSA: usb-audio: Fix use-after-free in snd_usb_mixer_free()<br /> <br /> When snd_usb_create_mixer() fails, snd_usb_mixer_free() frees<br /> mixer-&gt;id_elems but the controls already added to the card still<br /> reference the freed memory. Later when snd_card_register() runs,<br /> the OSS mixer layer calls their callbacks and hits a use-after-free read.<br /> <br /> Call trace:<br /> get_ctl_value+0x63f/0x820 sound/usb/mixer.c:411<br /> get_min_max_with_quirks.isra.0+0x240/0x1f40 sound/usb/mixer.c:1241<br /> mixer_ctl_feature_info+0x26b/0x490 sound/usb/mixer.c:1381<br /> snd_mixer_oss_build_test+0x174/0x3a0 sound/core/oss/mixer_oss.c:887<br /> ...<br /> snd_card_register+0x4ed/0x6d0 sound/core/init.c:923<br /> usb_audio_probe+0x5ef/0x2a90 sound/usb/card.c:1025<br /> <br /> Fix by calling snd_ctl_remove() for all mixer controls before freeing<br /> id_elems. We save the next pointer first because snd_ctl_remove()<br /> frees the current element.