Use-after-free in Linux kernel - CVE-2021-46930
Published: May 31, 2024 / Updated: May 14, 2025
Vulnerability identifier: #VU90258
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-46930
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use-after-free error within the mtu3_alloc_request() function in drivers/usb/mtu3/mtu3_gadget.c. A local user can escalate privileges on the system.
How to mitigate CVE-2021-46930
Install update from vendor's website.
Sources
- https://git.kernel.org/stable/c/585e2b244dda7ea733274e4b8fa27853d625d3bf
- https://git.kernel.org/stable/c/3b6efe0b7ba03cc2acf0694b46d6ff33c5b4c295
- https://git.kernel.org/stable/c/249ddfbe00570d6dc76208e88017937d4d374c79
- https://git.kernel.org/stable/c/8c313e3bfd9adae8d5c4ba1cc696dcbc86fbf9bf
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.90
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.13
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.170