GHSA-4MG3-V7F5-C2HJ
Vulnerability from github – Published: 2026-10-06 09:31 – Updated: 2026-10-06 09:31In the Linux kernel, the following vulnerability has been resolved:
ALSA: core: Fix potential UAF after asynchronous card release
Usually a sound driver releases the resources assigned to the card via snd_card_free(), and it synchronizes with the whole release procedure. However, when the card is released asynchronously via snd_card_free_when_closed() like USB-audio driver, the situation is slightly different; although the snd_card_disconnect() call at the disconnection guarantees that any newer accesses will be gated, the in-flight tasks might be still accessing to the underlying card->dev device even after the disconnection, which would cause a use-after-free in the end, as reported by fuzzers.
For addressing the bug above, this patch takes the refcount of card->dev at initialization of the card object, and releases at its destructor. This assures the availability of the card->dev in its whole lifecycle.
{
"affected": [],
"aliases": [
"CVE-2026-98266"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-06T09:18:15Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: core: Fix potential UAF after asynchronous card release\n\nUsually a sound driver releases the resources assigned to the card via\nsnd_card_free(), and it synchronizes with the whole release procedure.\nHowever, when the card is released asynchronously via\nsnd_card_free_when_closed() like USB-audio driver, the situation is\nslightly different; although the snd_card_disconnect() call at the\ndisconnection guarantees that any newer accesses will be gated, the\nin-flight tasks might be still accessing to the underlying card-\u003edev\ndevice even after the disconnection, which would cause a\nuse-after-free in the end, as reported by fuzzers.\n\nFor addressing the bug above, this patch takes the refcount of\ncard-\u003edev at initialization of the card object, and releases at its\ndestructor. This assures the availability of the card-\u003edev in its\nwhole lifecycle.",
"id": "GHSA-4mg3-v7f5-c2hj",
"modified": "2026-10-06T09:31:32Z",
"published": "2026-10-06T09:31:32Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98266"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2dec4642589a663e064e4411d92d6e8fa250d53b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/398b21608955c9712a012355b69a39407367edc9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5c0df40aa577e405c458e44e8d458dd78407f4af"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fd95e68df6fe66344161a1329cbe5e5805e7b704"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
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