GHSA-XCW2-5VFJ-H3FM
Vulnerability from github – Published: 2026-10-14 15:32 – Updated: 2026-10-14 15:32In the Linux kernel, the following vulnerability has been resolved:
ALSA: usb: 6fire: Avoid embedded URBs
The USB 6fire driver uses URBs embedded in different structs for PCM, MIDI and communication, and this is basically a buggy implementation nowadays; since a URB is managed with a refcount, this may lead to a UAF when the URB is released asynchronously.
For addressing the problem, this patch converts those embedded URBs to ones that are properly allocated via usb_alloc_urb(). The pcm_urb.packets[] is gone, as it's allocated by usb_alloc_urb(), hence it's found in urb.iso_frame_desc[] instead.
The conversions are rather straightforward; each embedded struct urb is changed to a pointer, and its callers are updated accordingly. The resource for those structs are released in the common destructor functions (usb6fire_comm_free(), etc), which are called at both the init error path and the disconnect.
No functional changes, only compile-tested.
{
"affected": [],
"aliases": [
"CVE-2026-98428"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-14T14:17:54Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb: 6fire: Avoid embedded URBs\n\nThe USB 6fire driver uses URBs embedded in different structs for PCM,\nMIDI and communication, and this is basically a buggy implementation\nnowadays; since a URB is managed with a refcount, this may lead to a\nUAF when the URB is released asynchronously.\n\nFor addressing the problem, this patch converts those embedded URBs to\nones that are properly allocated via usb_alloc_urb(). The\npcm_urb.packets[] is gone, as it\u0027s allocated by usb_alloc_urb(), hence\nit\u0027s found in urb.iso_frame_desc[] instead.\n\nThe conversions are rather straightforward; each embedded struct urb\nis changed to a pointer, and its callers are updated accordingly.\nThe resource for those structs are released in the common destructor\nfunctions (usb6fire_comm_free(), etc), which are called at both the\ninit error path and the disconnect.\n\nNo functional changes, only compile-tested.",
"id": "GHSA-xcw2-5vfj-h3fm",
"modified": "2026-10-14T15:32:21Z",
"published": "2026-10-14T15:32:21Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98428"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3ef9093d83ffecb8e5f6c9d5769a52d39df74f7a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/52a43c2d57e774489ac3fbbac06ff02f19bd9a52"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8b8559aeaba2e51cfee1779b2383b085991f7d81"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/999f433c09e4668412bd68ca207ae2b4af863862"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9fe49dbc023e82dfaee7b245997d820d01742a9a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d181434549b3da668110a25d743848cce9897f4e"
}
],
"schema_version": "1.4.0",
"severity": []
}
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