CVE-2024-27001

Technical Description

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

comedi: vmk80xx: fix incomplete endpoint checking

While vmk80xx does have endpoint checking implemented, some things

can fall through the cracks. Depending on the hardware model,

URBs can have either bulk or interrupt type, and current version

of vmk80xx_find_usb_endpoints() function does not take that fully

into account. While this warning does not seem to be too harmful,

at the very least it will crash systems with 'panic_on_warn' set on

them.

Fix the issue found by Syzkaller [1] by somewhat simplifying the

endpoint checking process with usb_find_common_endpoints() and

ensuring that only expected endpoint types are present.

This patch has not been tested on real hardware.

[1] Syzkaller report:

usb 1-1: BOGUS urb xfer, pipe 1 != type 3

WARNING: CPU: 0 PID: 781 at drivers/usb/core/urb.c:504 usb_submit_urb+0xc4e/0x18c0 drivers/usb/core/urb.c:503

...

Call Trace:

<TASK>

usb_start_wait_urb+0x113/0x520 drivers/usb/co

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References