GHSA-WWM2-CHQ9-C6MX
Vulnerability from github – Published: 2026-09-24 18:31 – Updated: 2026-09-24 18:31In the Linux kernel, the following vulnerability has been resolved:
usb: gadget: f_tcm: fix deadlock in usbg_make_tpg()
usbg_make_tpg() held dep_lock while calling configfs_depend_item_unlocked(), which acquires the configfs root inode lock when operating across subsystems. This creates a circular lock dependency with configfs_rmdir():
dep_lock -> configfs root inode lock -> su_mutex -> dep_lock
In usbg_make_tpg(), dep_lock only serialized the read of opts->ready, which is a monotonic flag that transitions from false to true exactly once (in tcm_set_name()) and never reverts. Remove dep_lock from usbg_make_tpg() entirely and use READ_ONCE/WRITE_ONCE to access opts->ready locklessly instead.
{
"affected": [],
"aliases": [
"CVE-2026-93214"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-24T16:17:16Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_tcm: fix deadlock in usbg_make_tpg()\n\nusbg_make_tpg() held dep_lock while calling\nconfigfs_depend_item_unlocked(), which acquires the configfs root\ninode lock when operating across subsystems. This creates a circular\nlock dependency with configfs_rmdir():\n\n dep_lock -\u003e configfs root inode lock -\u003e su_mutex -\u003e dep_lock\n\nIn usbg_make_tpg(), dep_lock only serialized the read of opts-\u003eready,\nwhich is a monotonic flag that transitions from false to true exactly\nonce (in tcm_set_name()) and never reverts. Remove dep_lock from\nusbg_make_tpg() entirely and use READ_ONCE/WRITE_ONCE to access\nopts-\u003eready locklessly instead.",
"id": "GHSA-wwm2-chq9-c6mx",
"modified": "2026-09-24T18:31:22Z",
"published": "2026-09-24T18:31:22Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93214"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3639438a4c83ffc2e564c8c010b92137c5d11cfa"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6bcd9ee6ad6989d1d85a7459687e45b7ad7568d9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/78a14ea2284825055ab6c2a1f3489510f560f3a2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9dbf74f4022f80f7669d2b3c22c5deb46c1b5674"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/abad5daa41cf5d0a0a9cba0397d3a0e7f11e0277"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d90b0f90e30cd59b36005a4016b15cf02bcd7fb2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/eef3e62f90d86c1c5651742f84ecc9db1814a893"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f81a2da137b029a282b9bc64d2f267d242948659"
}
],
"schema_version": "1.4.0",
"severity": []
}
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