CVE-2022-50034 usb: cdns3 fix use-after-free at workaround 2
A use-after-free vulnerability in the Linux kernel's cdns3 USB driver allows attackers to cause a denial of service or potentially execute arbitrary code.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-50034?
CVE-2022-50034 is a high-severity use after free vulnerability in Linux kernel, published on 18 Jun 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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().
Weakness: CWE-416
Which versions are affected by CVE-2022-50034?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-50034?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2022-50034 being exploited?
There is no known exploitation of CVE-2022-50034 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-50034, GHSA-7fcf-99gr-mjr2, UBUNTU-CVE-2022-50034.