CVE-2026-23089 (GCVE-0-2026-23089)

Vulnerability from cvelistv5 – Published: 2026-02-04 16:08 – Updated: 2026-02-09 08:38
VLAI?
Title
ALSA: usb-audio: Fix use-after-free in snd_usb_mixer_free()
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6639b6c2367f884ca172b78d69f7da17bfab2e5e , < 51b1aa6fe7dc87356ba58df06afb9677c9b841ea (git)
Affected: 6639b6c2367f884ca172b78d69f7da17bfab2e5e , < 56fb6efd5d04caf6f14994d51ec85393b9a896c6 (git)
Affected: 6639b6c2367f884ca172b78d69f7da17bfab2e5e , < 7009daeefa945973a530b2f605fe445fc03747af (git)
Affected: 6639b6c2367f884ca172b78d69f7da17bfab2e5e , < 7bff0156d13f0ad9436e5178b979b063d59f572a (git)
Affected: 6639b6c2367f884ca172b78d69f7da17bfab2e5e , < e6f103a22b08daf5df2f4aa158081840e5910963 (git)
Affected: 6639b6c2367f884ca172b78d69f7da17bfab2e5e , < dc1a5dd80af1ee1f29d8375b12dd7625f6294dad (git)
Affected: 6639b6c2367f884ca172b78d69f7da17bfab2e5e , < 930e69757b74c3ae083b0c3c7419bfe7f0edc7b2 (git)
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    Linux Linux Affected: 2.6.13
Unaffected: 0 , < 2.6.13 (semver)
Unaffected: 5.10.249 , ≤ 5.10.* (semver)
Unaffected: 5.15.199 , ≤ 5.15.* (semver)
Unaffected: 6.1.162 , ≤ 6.1.* (semver)
Unaffected: 6.6.122 , ≤ 6.6.* (semver)
Unaffected: 6.12.68 , ≤ 6.12.* (semver)
Unaffected: 6.18.8 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: Fix use-after-free in snd_usb_mixer_free()\n\nWhen snd_usb_create_mixer() fails, snd_usb_mixer_free() frees\nmixer-\u003eid_elems but the controls already added to the card still\nreference the freed memory. Later when snd_card_register() runs,\nthe OSS mixer layer calls their callbacks and hits a use-after-free read.\n\nCall trace:\n  get_ctl_value+0x63f/0x820 sound/usb/mixer.c:411\n  get_min_max_with_quirks.isra.0+0x240/0x1f40 sound/usb/mixer.c:1241\n  mixer_ctl_feature_info+0x26b/0x490 sound/usb/mixer.c:1381\n  snd_mixer_oss_build_test+0x174/0x3a0 sound/core/oss/mixer_oss.c:887\n  ...\n  snd_card_register+0x4ed/0x6d0 sound/core/init.c:923\n  usb_audio_probe+0x5ef/0x2a90 sound/usb/card.c:1025\n\nFix by calling snd_ctl_remove() for all mixer controls before freeing\nid_elems. We save the next pointer first because snd_ctl_remove()\nfrees the current element."
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Later when snd_card_register() runs,\\nthe OSS mixer layer calls their callbacks and hits a use-after-free read.\\n\\nCall trace:\\n  get_ctl_value+0x63f/0x820 sound/usb/mixer.c:411\\n  get_min_max_with_quirks.isra.0+0x240/0x1f40 sound/usb/mixer.c:1241\\n  mixer_ctl_feature_info+0x26b/0x490 sound/usb/mixer.c:1381\\n  snd_mixer_oss_build_test+0x174/0x3a0 sound/core/oss/mixer_oss.c:887\\n  ...\\n  snd_card_register+0x4ed/0x6d0 sound/core/init.c:923\\n  usb_audio_probe+0x5ef/0x2a90 sound/usb/card.c:1025\\n\\nFix by calling snd_ctl_remove() for all mixer controls before freeing\\nid_elems. We save the next pointer first because snd_ctl_remove()\\nfrees the current element.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:\\n\\nALSA: usb-audio: Correcci\u00f3n de uso despu\u00e9s de liberaci\u00f3n en snd_usb_mixer_free()\\n\\nCuando snd_usb_create_mixer() falla, snd_usb_mixer_free() libera mixer-\u0026gt;id_elems, pero los controles ya a\u00f1adidos a la tarjeta siguen referenciando la memoria liberada. M\u00e1s tarde, cuando se ejecuta snd_card_register(), la capa del mezclador OSS llama a sus retrollamadas y se produce una lectura de uso despu\u00e9s de liberaci\u00f3n.\\n\\nTraza de llamada:\\n  get_ctl_value+0x63f/0x820 sound/usb/mixer.c:411\\n  get_min_max_with_quirks.isra.0+0x240/0x1f40 sound/usb/mixer.c:1241\\n  mixer_ctl_feature_info+0x26b/0x490 sound/usb/mixer.c:1381\\n  snd_mixer_oss_build_test+0x174/0x3a0 sound/core/oss/mixer_oss.c:887\\n  ...\\n  snd_card_register+0x4ed/0x6d0 sound/core/init.c:923\\n  usb_audio_probe+0x5ef/0x2a90 sound/usb/card.c:1025\\n\\nSe corrige llamando a snd_ctl_remove() para todos los controles del mezclador antes de liberar id_elems. 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}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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