CVE-2026-31721 (GCVE-0-2026-31721)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:14 – Updated: 2026-05-02 06:14
VLAI?
Title
usb: gadget: f_hid: move list and spinlock inits from bind to alloc
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_hid: move list and spinlock inits from bind to alloc There was an issue when you did the following: - setup and bind an hid gadget - open /dev/hidg0 - use the resulting fd in EPOLL_CTL_ADD - unbind the UDC - bind the UDC - use the fd in EPOLL_CTL_DEL When CONFIG_DEBUG_LIST was enabled, a list_del corruption was reported within remove_wait_queue (via ep_remove_wait_queue). After some debugging I found out that the queues, which f_hid registers via poll_wait were the problem. These were initialized using init_waitqueue_head inside hidg_bind. So effectively, the bind function re-initialized the queues while there were still items in them. The solution is to move the initialization from hidg_bind to hidg_alloc to extend their lifetimes to the lifetime of the function instance. Additionally, I found many other possibly problematic init calls in the bind function, which I moved as well.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: cb382536052fcc7713988869b54a81137069e5a9 , < 13440c0db227c5db01da751ed966dde4cdd2ea18 (git)
Affected: cb382536052fcc7713988869b54a81137069e5a9 , < de93e0862169b5539e00c2b9980b93fd80c37c0d (git)
Affected: cb382536052fcc7713988869b54a81137069e5a9 , < 81aee4500055876883658b024b6fb61801afe134 (git)
Affected: cb382536052fcc7713988869b54a81137069e5a9 , < 8ec6a58586f195a88479edcdb0b8027c39f12d03 (git)
Affected: cb382536052fcc7713988869b54a81137069e5a9 , < f7d00ee1c8082c8a134340aaf16d71a27e29c362 (git)
Affected: cb382536052fcc7713988869b54a81137069e5a9 , < 5d1bb391ceeebb28327703dd07af8c6324af298f (git)
Affected: cb382536052fcc7713988869b54a81137069e5a9 , < 26a879a41ed960b3fb4ec773ef2788c515c0e488 (git)
Affected: cb382536052fcc7713988869b54a81137069e5a9 , < 4e0a88254ad59f6c53a34bf5fa241884ec09e8b2 (git)
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    Linux Linux Affected: 3.19
Unaffected: 0 , < 3.19 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.169 , ≤ 6.1.* (semver)
Unaffected: 6.6.135 , ≤ 6.6.* (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_hid.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_hid: move list and spinlock inits from bind to alloc\n\nThere was an issue when you did the following:\n- setup and bind an hid gadget\n- open /dev/hidg0\n- use the resulting fd in EPOLL_CTL_ADD\n- unbind the UDC\n- bind the UDC\n- use the fd in EPOLL_CTL_DEL\n\nWhen CONFIG_DEBUG_LIST was enabled, a list_del corruption was reported\nwithin remove_wait_queue (via ep_remove_wait_queue). After some\ndebugging I found out that the queues, which f_hid registers via\npoll_wait were the problem. These were initialized using\ninit_waitqueue_head inside hidg_bind. So effectively, the bind function\nre-initialized the queues while there were still items in them.\n\nThe solution is to move the initialization from hidg_bind to hidg_alloc\nto extend their lifetimes to the lifetime of the function instance.\n\nAdditionally, I found many other possibly problematic init calls in the\nbind function, which I moved as well."
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  }
}


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