GHSA-M6WV-VGQ8-7PQJ
Vulnerability from github – Published: 2026-10-18 18:32 – Updated: 2026-10-30 15:34In the Linux kernel, the following vulnerability has been resolved:
usb: gadget: f_uac1_legacy: validate bRequest index in generic_{set,get}_cmd
generic_set_cmd() and generic_get_cmd() use the low nibble of ctrl->bRequest as an index into con->data[]:
u8 cmd = (ctrl->bRequest & 0x0F); /* 0 .. 15 */
...
con->data[cmd] = value; /* OOB when cmd >= 5 */
struct usb_audio_control (include/linux/usb/audio.h) declares data as a 5-element array, so indices 5 through 15 write (or read) up to 44 bytes past the end of the array on the heap.
A malicious USB host can craft a class-specific SET_CUR / GET_CUR request with an arbitrary bRequest value, triggering the out-of-bounds access from an IRQ completion handler with no further preconditions.
Add an ARRAY_SIZE() guard to both functions.
{
"affected": [],
"aliases": [
"CVE-2026-98769"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-18T16:17:30Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_uac1_legacy: validate bRequest index in generic_{set,get}_cmd\n\ngeneric_set_cmd() and generic_get_cmd() use the low nibble of\nctrl-\u003ebRequest as an index into con-\u003edata[]:\n\n u8 cmd = (ctrl-\u003ebRequest \u0026 0x0F); /* 0 .. 15 */\n ...\n con-\u003edata[cmd] = value; /* OOB when cmd \u003e= 5 */\n\nstruct usb_audio_control (include/linux/usb/audio.h) declares data as\na 5-element array, so indices 5 through 15 write (or read) up to 44\nbytes past the end of the array on the heap.\n\nA malicious USB host can craft a class-specific SET_CUR / GET_CUR\nrequest with an arbitrary bRequest value, triggering the out-of-bounds\naccess from an IRQ completion handler with no further preconditions.\n\nAdd an ARRAY_SIZE() guard to both functions.",
"id": "GHSA-m6wv-vgq8-7pqj",
"modified": "2026-10-30T15:34:00Z",
"published": "2026-10-18T18:32:02Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98769"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/36f3f009049bc91e14dc856007932473318d12f8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3e655ebe0e45b7b026a4d3e6c10586b95164b3fd"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/697cfe6e53b66cda196d6f8833b0ee97fefd0a8a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8c611876c002d712ae5f246af5188432c708f79d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9062d50e75c24dc7911be05c9b1719b3b256af15"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/da841c1511a6160b8bc6bb7b7c6d4c9fb76fb51e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f0ff630d83c12c9a97637dded1dc27558bee3760"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f8a4ddc23056560dc3333839a4c6998f644db303"
}
],
"schema_version": "1.4.0",
"severity": []
}
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