In the Linux kernel, the following vulnerability has been resolved:
usbip: vudc: fix NULL deref in vep_dequeue()
vep_alloc_request() wasn't initializing vrequest->udc, so cancellations on the FunctionFS AIO path were arriving in vep_dequeue without a valid UDC reference.
Since vrequest->udc is never actually properly used anywhere, we opt to remove it, and update vep_dequeue to obtain a reference to the udc with ep_to_vudc(), consistent with the other vep_ ops.
AFAICT this bug has existed for ~10 years. Seems that nobody has really stressed the FunctionFS AIO path on usbip's vudc.
I tested this fix in a QEMU aarch64 guest driving FunctionFS endpoints via AIO. Before the fix, running `usbip attach` from the host would cause the guest to oops with the following backtrace:
Call trace: vep_dequeue+0x1c/0xe4 (P) usb_ep_dequeue+0x14/0x20 ffs_aio_cancel+0x24/0x34 __arm64_sys_io_cancel+0xb0/0x124 do_el0_svc+0x68/0x100 el0_svc+0x18/0x5c el0t_64_sync_handler+0x98/0xdc el0t_64_sync+0x154/0x158
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux-6.12Upgrade linuxUpgrade linux-6.1 | Jul 28, 2026 | Jul 28, 2026 |
| Ubuntu | — | Upgrade linux-image-raspi-realtime-7.0Upgrade linux-image-7.0.0-1019-raspi-realtimeUpgrade linux-image-nvidia-bosUpgrade linux-image-gke-64k-hwe-26.04Upgrade linux-image-7.0.0-1019-raspiUpgrade linux-image-gkeUpgrade linux-image-genericUpgrade linux-image-ibmUpgrade linux-image-generic-64k-hwe-26.04Upgrade linux-image-oem-26.04aUpgrade linux-image-generic-64kUpgrade linux-image-realtime-7.0Upgrade linux-image-realtime-hwe-26.04Upgrade linux-image-7.0.0-31-realtimeUpgrade linux-image-7.0.0-31-realtime-64kUpgrade linux-image-aws-64kUpgrade linux-image-7.0.0-31-generic-64kUpgrade linux-image-7.0.0-2018-nvidia-bosUpgrade linux-image-7.0.0-1013-oemUpgrade linux-image-generic-64k-7.0Upgrade linux-image-virtualUpgrade linux-image-ibm-7.0Upgrade linux-image-nvidiaUpgrade linux-image-oem-26.04bUpgrade linux-image-oem-26.04Upgrade linux-image-7.0.0-1006-gkeUpgrade linux-image-aws-7.0Upgrade linux-image-nvidia-hwe-26.04Upgrade linux-image-nvidia-64k-7.0Upgrade linux-image-7.0.0-1018-nvidia-64kUpgrade linux-image-raspiUpgrade linux-image-nvidia-64k-hwe-26.04Upgrade linux-image-nvidia-bos-7.0Upgrade linux-image-aws-64k-7.0Upgrade linux-image-gcp-7.0Upgrade linux-image-gke-7.0Upgrade linux-image-generic-7.0Upgrade linux-image-gcpUpgrade linux-image-realtime-64k-hwe-26.04Upgrade linux-image-nvidia-bos-64kUpgrade linux-image-virtual-hwe-26.04Upgrade linux-image-7.0.0-1012-aws-64kUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-nvidia-7.0Upgrade linux-image-gke-hwe-26.04Upgrade linux-image-gke-64kUpgrade linux-image-7.0.0-1011-gcp-64kUpgrade linux-image-7.0.0-1012-awsUpgrade linux-image-realtime-64k-7.0Upgrade linux-image-virtual-7.0Upgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-oem-7.0Upgrade linux-image-generic-hwe-24.04Upgrade linux-image-nvidia-bos-64k-7.0Upgrade linux-image-7.0.0-1013-ibmUpgrade linux-image-gcp-64k-7.0Upgrade linux-image-nvidia-64kUpgrade linux-image-7.0.0-1018-nvidiaUpgrade linux-image-generic-hwe-26.04Upgrade linux-image-7.0.0-31-genericUpgrade linux-image-7.0.0-1006-gke-64kUpgrade linux-image-raspi-realtimeUpgrade linux-image-awsUpgrade linux-image-gke-64k-7.0Upgrade linux-image-realtimeUpgrade linux-image-7.0.0-2018-nvidia-bos-64kUpgrade linux-image-gcp-64kUpgrade linux-image-7.0.0-1011-gcpUpgrade linux-image-realtime-64kUpgrade linux-image-raspi-7.0 | Sep 14, 2026 | Sep 7, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 3, 2026 | Jul 25, 2026 |
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