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CVE-2026-23089

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.249, 5.15.199, 6.1.162, 6.6.122, 6.12.68, and 1 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 6639b6c2367f884ca172b78d69f7da17bfab2e5e · fixed in 51b1aa6fe7dc87356ba58df06afb9677c9b841ea; From 6639b6c2367f884ca172b78d69f7da17bfab2e5e · fixed in 56fb6efd5d04caf6f14994d51ec85393b9a896c6; From 6639b6c2367f884ca172b78d69f7da17bfab2e5e · fixed in 7009daeefa945973a530b2f605fe445fc03747af; From 6639b6c2367f884ca172b78d69f7da17bfab2e5e · fixed in 7bff0156d13f0ad9436e5178b979b063d59f572a; From 6639b6c2367f884ca172b78d69f7da17bfab2e5e · fixed in e6f103a22b08daf5df2f4aa158081840e5910963; From 6639b6c2367f884ca172b78d69f7da17bfab2e5e · fixed in dc1a5dd80af1ee1f29d8375b12dd7625f6294dad; From 6639b6c2367f884ca172b78d69f7da17bfab2e5e · fixed in 930e69757b74c3ae083b0c3c7419bfe7f0edc7b2

  • Linux Linux

    2.6.13

  • KernelLinux

    From 2.6.13 · fixed in 5.10.249; From 5.11.0 · fixed in 5.15.199; From 5.16.0 · fixed in 6.1.162; From 6.2.0 · fixed in 6.6.122; From 6.7.0 · fixed in 6.12.68; From 6.13.0 · fixed in 6.18.8

References 7

git.kernel.org