In the Linux kernel, the following vulnerability has been resolved:

misc/uss720: fix memory leak in uss720_probe

uss720_probe forgets to decrease the refcount of usbdev in uss720_probe.
Fix this by decreasing the refcount of usbdev by usb_put_dev.

BUG: memory leak
unreferenced object 0xffff888101113800 (size 2048):
comm "kworker/0:1", pid 7, jiffies 4294956777 (age 28.870s)
hex dump (first 32 bytes):
ff ff ff ff 31 00 00 00 00 00 00 00 00 00 00 00 ....1...........
00 00 00 00 00 00 00 00 00 00 00 00 03 00 00 00 ................
backtrace:
[] kmalloc include/linux/slab.h:554 [inline]
[] kzalloc include/linux/slab.h:684 [inline]
[] usb_alloc_dev+0x32/0x450 drivers/usb/core/usb.c:582
[] hub_port_connect drivers/usb/core/hub.c:5129 [inline]
[] hub_port_connect_change drivers/usb/core/hub.c:5363 [inline]
[] port_event drivers/usb/core/hub.c:5509 [inline]
[] hub_event+0x1171/0x20c0 drivers/usb/core/hub.c:5591
[] process_one_work+0x2c9/0x600 kernel/workqueue.c:2275
[] worker_thread+0x59/0x5d0 kernel/workqueue.c:2421
[] kthread+0x178/0x1b0 kernel/kthread.c:292
[] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-47173
• https://git.kernel.org/stable/c/36b5ff1db1a4ef4fdbc2bae364344279f033ad88
• https://git.kernel.org/stable/c/386918878ce4cd676e4607233866e03c9399a46a
• https://git.kernel.org/stable/c/5394ae9d8c7961dd93807fdf1b12a1dde96b0a55
• https://git.kernel.org/stable/c/5f46b2410db2c8f26b8bb91b40deebf4ec184391
• https://git.kernel.org/stable/c/7889c70e6173ef358f3cd7578db127a489035a42
• https://git.kernel.org/stable/c/a3c3face38cb49932c62adcc1289914f1c742096
• https://git.kernel.org/stable/c/bcb30cc8f8befcbdbcf7a016e4dfd4747c54a364
• https://git.kernel.org/stable/c/dcb4b8ad6a448532d8b681b5d1a7036210b622de