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.
References
Configurations
Configuration 1 (hide)
|
History
06 May 2026, 20:56
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | NVD-CWE-noinfo | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| References | () https://git.kernel.org/stable/c/13440c0db227c5db01da751ed966dde4cdd2ea18 - Patch | |
| References | () https://git.kernel.org/stable/c/26a879a41ed960b3fb4ec773ef2788c515c0e488 - Patch | |
| References | () https://git.kernel.org/stable/c/4e0a88254ad59f6c53a34bf5fa241884ec09e8b2 - Patch | |
| References | () https://git.kernel.org/stable/c/5d1bb391ceeebb28327703dd07af8c6324af298f - Patch | |
| References | () https://git.kernel.org/stable/c/81aee4500055876883658b024b6fb61801afe134 - Patch | |
| References | () https://git.kernel.org/stable/c/8ec6a58586f195a88479edcdb0b8027c39f12d03 - Patch | |
| References | () https://git.kernel.org/stable/c/de93e0862169b5539e00c2b9980b93fd80c37c0d - Patch | |
| References | () https://git.kernel.org/stable/c/f7d00ee1c8082c8a134340aaf16d71a27e29c362 - Patch | |
| CPE | cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:* |
|
| First Time |
Linux
Linux linux Kernel |
01 May 2026, 15:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-01 15:16
Updated : 2026-06-17 10:34
NVD link : CVE-2026-31721
Mitre link : CVE-2026-31721
CVE.ORG link : CVE-2026-31721
JSON object : View
Products Affected
linux
- linux_kernel
CWE