GHSA-H8V3-969R-CFP9
Vulnerability from github – Published: 2026-02-04 18:30 – Updated: 2026-03-17 21:31In 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": [],
"aliases": [
"CVE-2026-23089"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-02-04T17:16:19Z",
"severity": "HIGH"
},
"details": "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.",
"id": "GHSA-h8v3-969r-cfp9",
"modified": "2026-03-17T21:31:40Z",
"published": "2026-02-04T18:30:44Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23089"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/51b1aa6fe7dc87356ba58df06afb9677c9b841ea"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/56fb6efd5d04caf6f14994d51ec85393b9a896c6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7009daeefa945973a530b2f605fe445fc03747af"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7bff0156d13f0ad9436e5178b979b063d59f572a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/930e69757b74c3ae083b0c3c7419bfe7f0edc7b2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/dc1a5dd80af1ee1f29d8375b12dd7625f6294dad"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e6f103a22b08daf5df2f4aa158081840e5910963"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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