Overview
About vulnerability
In the Linux kernel, the following vulnerability has been resolved:
usb: cdns3 fix use-after-free at workaround 2
BUG: KFENCE: use-after-free read in __list_del_entry_valid+0x10/0xac
cdns3_wa2_remove_old_request() { … kfree(priv_req->request.buf); cdns3_gadget_ep_free_request(&priv_ep->endpoint, &priv_req->request); list_del_init(&priv_req->list); ^^^ use after free … }
cdns3_gadget_ep_free_request() free the space pointed by priv_req, but priv_req is used in the following list_del_init().
This patch move list_del_init() before cdns3_gadget_ep_free_request().
Details
- Affected product:
- AlmaLinux 9.2 ESU , Oracle Linux 7 ELS , TuxCare 9.6 ESU , Ubuntu 20.04 ELS
- Affected packages:
- linux @ 5.4.0 (+3 more)
In the Linux kernel, the following vulnerability has been resolved:
usb: cdns3 fix use-after-free at workaround 2
BUG: KFENCE: use-after-free read in __list_del_entry_valid+0x10/0xac
cdns3_wa2_remove_old_request() { … kfree(priv_req->request.buf); cdns3_gadget_ep_free_request(&priv_ep->endpoint, &priv_req->request); list_del_init(&priv_req->list); ^^^ use after free … }
cdns3_gadget_ep_free_request() free the space pointed by priv_req, but priv_req is used in the following list_del_init().
This patch move list_del_init() before cdns3_gadget_ep_free_request().