CVE-2026-23089

Summary

In the Linux kernel, the following vulnerability has been resolved:

ALSA: usb-audio: Fix use-after-free in snd_usb_mixer_free()

When snd_usb_create_mixer() fails, snd_usb_mixer_free() frees mixer->id_elems but the controls already added to the card still reference the freed memory. Later when snd_card_register() runs, the OSS mixer layer calls their callbacks and hits a use-after-free read.

Call trace: get_ctl_value+0x63f/0x820 sound/usb/mixer.c:411 get_min_max_with_quirks.isra.0+0x240/0x1f40 sound/usb/mixer.c:1241 mixer_ctl_feature_info+0x26b/0x490 sound/usb/mixer.c:1381 snd_mixer_oss_build_test+0x174/0x3a0 sound/core/oss/mixer_oss.c:887 … snd_card_register+0x4ed/0x6d0 sound/core/init.c:923 usb_audio_probe+0x5ef/0x2a90 sound/usb/card.c:1025

Fix by calling snd_ctl_remove() for all mixer controls before freeing id_elems. We save the next pointer first because snd_ctl_remove() frees the current element.

Affected Software

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

References

• https://git.kernel.org/stable/c/51b1aa6fe7dc87356ba58df06afb9677c9b841ea
• https://git.kernel.org/stable/c/56fb6efd5d04caf6f14994d51ec85393b9a896c6
• https://git.kernel.org/stable/c/7009daeefa945973a530b2f605fe445fc03747af
• https://git.kernel.org/stable/c/7bff0156d13f0ad9436e5178b979b063d59f572a
• https://git.kernel.org/stable/c/e6f103a22b08daf5df2f4aa158081840e5910963
• https://git.kernel.org/stable/c/dc1a5dd80af1ee1f29d8375b12dd7625f6294dad
• https://git.kernel.org/stable/c/930e69757b74c3ae083b0c3c7419bfe7f0edc7b2

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