CVE-2022-48834 Affecting kernel-rt package, versions *

Note: Versions mentioned in the description apply only to the upstream kernel-rt package and not the kernel-rt package as distributed by Centos. See How to fix? for Centos:7 relevant fixed versions and status.

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

usb: usbtmc: Fix bug in pipe direction for control transfers

The syzbot fuzzer reported a minor bug in the usbtmc driver:

usb 5-1: BOGUS control dir, pipe 80001e80 doesn't match bRequestType 0 WARNING: CPU: 0 PID: 3813 at drivers/usb/core/urb.c:412 usb_submit_urb+0x13a5/0x1970 drivers/usb/core/urb.c:410 Modules linked in: CPU: 0 PID: 3813 Comm: syz-executor122 Not tainted 5.17.0-rc5-syzkaller-00306-g2293be58d6a1 #0 ... Call Trace: <TASK> usb_start_wait_urb+0x113/0x530 drivers/usb/core/message.c:58 usb_internal_control_msg drivers/usb/core/message.c:102 [inline] usb_control_msg+0x2a5/0x4b0 drivers/usb/core/message.c:153 usbtmc_ioctl_request drivers/usb/class/usbtmc.c:1947 [inline]

The problem is that usbtmc_ioctl_request() uses usb_rcvctrlpipe() for all of its transfers, whether they are in or out. It's easy to fix.

• https://access.redhat.com/security/cve/CVE-2022-48834
• https://git.kernel.org/stable/c/10a805334a11acd547602d6c4cf540a0f6ab5c6e
• https://git.kernel.org/stable/c/5f6a2d63c68c12cf61259df7c3527a0e05dce952
• https://git.kernel.org/stable/c/700a0715854c1e79a73341724ce4f5bb01abc016
• https://git.kernel.org/stable/c/c69aef9db878ab277068a8cc1b4bf0cf309dc2b7
• https://git.kernel.org/stable/c/e9b667a82cdcfe21d590344447d65daed52b353b