7.8

CVE-2022-50034

usb: cdns3 fix use-after-free at workaround 2

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().
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 5.3 < 5.4.211
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.138
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.63
Linux ≫ Linux Kernel Version >= 5.16 < 5.19.4
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.06% 0.196
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.