CVE-2022-50034: linux kernel Use-After-Free — Fix

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().

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.3 — 5.4.211
linux	linux_kernel	5.5 — 5.10.138
linux	linux_kernel	5.11 — 5.15.63
linux	linux_kernel	5.16 — 5.19.4

References

Advisories & Patches

https://git.kernel.org/stable/c/6d7ac60098b206d0472475b666cb09d556bec03d https://git.kernel.org/stable/c/6fd50446e7c9a98b4bcf96815f5c9602a16ea472 https://git.kernel.org/stable/c/7d602f30149a117eea260208b1661bc404c21dfd https://git.kernel.org/stable/c/c3c1dbad3a2db32ecf371c97f2058491b8ba0f9a https://git.kernel.org/stable/c/e65d9b7147d7be3504893ca7dfb85286bda83d40

Frequently Asked Questions

What is CVE-2022-50034? +

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(). It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-50034? +

CVE-2022-50034 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2022-50034? +

CVE-2022-50034 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2022-50034? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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