Overview
About vulnerability
In the Linux kernel, the following vulnerability has been resolved:
usb: cdns3: fix memory double free when handle zero packet
829 if (request->complete) { 830 spin_unlock(&priv_dev->lock); 831 usb_gadget_giveback_request(&priv_ep->endpoint, 832 request); 833 spin_lock(&priv_dev->lock); 834 } 835 836 if (request->buf == priv_dev->zlp_buf) 837 cdns3_gadget_ep_free_request(&priv_ep->endpoint, request);
Driver append an additional zero packet request when queue a packet, which length mod max packet size is 0. When transfer complete, run to line 831, usb_gadget_giveback_request() will free this requestion. 836 condition is true, so cdns3_gadget_ep_free_request() free this request again.
Log:
[ 1920.140696][ T150] BUG: KFENCE: use-after-free read in cdns3_gadget_giveback+0x134/0x2c0 [cdns3] [ 1920.140696][ T150] [ 1920.151837][ T150] Use-after-free read at 0x000000003d1cd10b (in kfence-#36): [ 1920.159082][ T150] cdns3_gadget_giveback+0x134/0x2c0 [cdns3] [ 1920.164988][ T150] cdns3_transfer_completed+0x438/0x5f8 [cdns3]
Add check at line 829, skip call usb_gadget_giveback_request() if it is additional zero length packet request. Needn’t call usb_gadget_giveback_request() because it is allocated in this driver.
Details
- Affected product:
- AlmaLinux 9.2 ESU , Amazon Linux 2 ELS , Debian 10 ELS , Oracle Linux 7 ELS , TuxCare 9.6 ESU , Ubuntu 16.04 ELS , Ubuntu 18.04 ELS , Ubuntu 20.04 ELS
- Affected packages:
- kernel-uek @ 5.4.17 (+8 more)
Fixes
KernelCare state
Live-patch status from KernelCare for each operating system.
| Operating system | Status | Covered kernels |
|---|---|---|
| Debian 11 | Released |
28 kernels
|
| Debian 11 cloud | Released |
8 kernels
|
| Debian 12 | Planned | — |
| Proxmox VE 6 | Released |
41 kernels
|
| Proxmox VE 7 5.15 | Released |
44 kernels
|
| Ubuntu 18.04 AWS Focal | Released |
56 kernels
|
| Ubuntu 18.04 Azure Focal | Released |
58 kernels
|
| Ubuntu 18.04 HWE Focal | Released |
69 kernels
|
| Ubuntu 18.04 HWE GCP | Released |
15 kernels
|
| Ubuntu 20.04 | Released |
108 kernels
|
| Ubuntu 20.04 AWS | Released |
91 kernels
|
| Ubuntu 20.04 Azure | Released |
82 kernels
|
| Ubuntu 20.04 GCP | Released |
14 kernels
|
| Ubuntu 20.04 HWE AWS | Released |
39 kernels
|
| Ubuntu 20.04 HWE Azure | Released |
23 kernels
|
| Ubuntu 22.04 | Released |
52 kernels
|
| Ubuntu 22.04 AWS | Released |
46 kernels
|
| Ubuntu 22.04 Azure | Released |
43 kernels
|