Overview
About vulnerability
In the Linux kernel, the following vulnerability has been resolved:
usb: cdns3: fixed memory use after free at cdns3_gadget_ep_disable()
… cdns3_gadget_ep_free_request(&priv_ep->endpoint, &priv_req->request); list_del_init(&priv_req->list); …
‘priv_req’ actually free at cdns3_gadget_ep_free_request(). But list_del_init() use priv_req->list after it.
[ 1542.642868][ T534] BUG: KFENCE: use-after-free read in __list_del_entry_valid+0x10/0xd4 [ 1542.642868][ T534] [ 1542.653162][ T534] Use-after-free read at 0x000000009ed0ba99 (in kfence-#3): [ 1542.660311][ T534] __list_del_entry_valid+0x10/0xd4 [ 1542.665375][ T534] cdns3_gadget_ep_disable+0x1f8/0x388 [cdns3] [ 1542.671571][ T534] usb_ep_disable+0x44/0xe4 [ 1542.675948][ T534] ffs_func_eps_disable+0x64/0xc8 [ 1542.680839][ T534] ffs_func_set_alt+0x74/0x368 [ 1542.685478][ T534] ffs_func_disable+0x18/0x28
Move list_del_init() before cdns3_gadget_ep_free_request() to resolve this problem.
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 @ 5.14.0 (+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
|