DEBIAN-CVE-2026-23089

In the Linux kernel, the following vulnerability has been resolved:  ALSA: usb-audio: Fix use-after-free in sndusbmixerfree()  When sndusbcreatemixer() fails, sndusbmixerfree() frees mixer->idelems but the controls already added to the card still reference the freed memory. Later when sndcardregister() runs, the OSS mixer layer calls their callbacks and hits a use-after-free read.  Call trace:   getctlvalue+0x63f/0x820 sound/usb/mixer.c:411   getminmaxwithquirks.isra.0+0x240/0x1f40 sound/usb/mixer.c:1241   mixerctlfeatureinfo+0x26b/0x490 sound/usb/mixer.c:1381   sndmixerossbuildtest+0x174/0x3a0 sound/core/oss/mixeross.c:887   ...   sndcardregister+0x4ed/0x6d0 sound/core/init.c:923   usbaudioprobe+0x5ef/0x2a90 sound/usb/card.c:1025  Fix by calling sndctlremove() for all mixer controls before freeing idelems. We save the next pointer first because sndctl_remove() frees the current element.