Overview
About vulnerability
In the Linux kernel, the following vulnerability has been resolved:
usbnet: Prevents free active kevent
The root cause of this issue are:
-
When probing the usbnet device, executing usbnet_link_change(dev, 0, 0); put the kevent work in global workqueue. However, the kevent has not yet been scheduled when the usbnet device is unregistered. Therefore, executing free_netdev() results in the “free active object (kevent)” error reported here.
-
Another factor is that when calling usbnet_disconnect()->unregister_netdev(), if the usbnet device is up, ndo_stop() is executed to cancel the kevent. However, because the device is not up, ndo_stop() is not executed.
The solution to this problem is to cancel the kevent before executing free_netdev().
Details
- Affected product:
- Oracle Linux 7 ELS , Ubuntu 20.04 ELS
- Affected packages:
- kernel @ 3.10.0 (+2 more)
Fixes
KernelCare state
Live-patch status from KernelCare for each operating system.
| Operating system | Status | Covered kernels |
|---|---|---|
| Debian 12 | Released |
32 kernels
|
| Debian 13 | Will Not Fix | — |
| Oracle Linux 7 UEK 6 | Released |
112 kernels
|
| Oracle Linux 8 UEK 6 | Released |
143 kernels
|
| Oracle Linux 8 UEK 7 | Released |
76 kernels
|
| Oracle Linux 9 UEK 7 | Released |
76 kernels
|
| Proxmox VE 7 5.15 | Released |
21 kernels
|
| Ubuntu 20.04 HWE AWS | Released |
49 kernels
|
| Ubuntu 20.04 HWE Azure | Released |
32 kernels
|
| Ubuntu 22.04 | Released |
73 kernels
|
| Ubuntu 22.04 AWS | Released |
68 kernels
|
| Ubuntu 22.04 Azure | Released |
60 kernels
|
| Ubuntu 24.04 | Released |
39 kernels
|
| Ubuntu 24.04 AWS | Planned | — |