usb: gadget: f_hid: move list and spinlock inits from bind to alloc
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 3.19 and later | 5.10.253, 5.15.203, 6.1.169, 6.6.135, 6.12.81, 6.18.22, 6.19.12, 7.0 | Patch available | CNA |
- Linux VendorLinux Affected 3.19 and later Fixed in 5.10.253, 5.15.203, 6.1.169, 6.6.135, 6.12.81, 6.18.22, 6.19.12, 7.0 Patch available CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 3.19 to before 5.10.253; 5.11 to before 5.15.203; 5.16 to before 6.1.169; 6.2 to before 6.6.135; 6.7 to before 6.12.81; 6.13 to before 6.18.22; 6.19 to before 6.19.12 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* | 7.0 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* | 7.0 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* | 7.0 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* | 7.0 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:* | 7.0 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:* | 7.0 rc6 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 3.19 to before 5.10.253; 5.11 to before 5.15.203; 5.16 to before 6.1.169; 6.2 to before 6.6.135; 6.7 to before 6.12.81; 6.13 to before 6.18.22; 6.19 to before 6.19.12 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* Versions 7.0 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* Versions 7.0 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* Versions 7.0 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* Versions 7.0 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:* Versions 7.0 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:* Versions 7.0 rc6 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.253, 5.15.203, 6.1.169, 6.6.135, 6.12.81, 6.18.22, 6.19.12, 7.0
Vendor assessments
Red Hat
Not affected: 5 products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2026-31721
- 2026-10-03 Alias added: GHSA-8r63-5629-3mpc
References
Patch 8
- https://git.kernel.org/stable/c/13440c0db227c5db01da751ed966dde4cdd2ea18
- https://git.kernel.org/stable/c/de93e0862169b5539e00c2b9980b93fd80c37c0d
- https://git.kernel.org/stable/c/81aee4500055876883658b024b6fb61801afe134
- https://git.kernel.org/stable/c/8ec6a58586f195a88479edcdb0b8027c39f12d03
- https://git.kernel.org/stable/c/f7d00ee1c8082c8a134340aaf16d71a27e29c362
- https://git.kernel.org/stable/c/5d1bb391ceeebb28327703dd07af8c6324af298f
- https://git.kernel.org/stable/c/26a879a41ed960b3fb4ec773ef2788c515c0e488
- https://git.kernel.org/stable/c/4e0a88254ad59f6c53a34bf5fa241884ec09e8b2
More Linux Kernel vulnerabilities
- TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
- TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
- TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
- TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
- TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2026-31721 · CVE Program
- CVE-2026-31721 · NVD
- FIRST EPSS
- GHSA-8r63-5629-3mpc · GitHub Advisory Database · CC BY 4.0
- CVE-2026-31721 · Red Hat security data · CC BY 4.0
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