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:

usb_start_wait_urb+0x113/0x520 drivers/usb/core/message.c:59
vmk80xx_reset_device drivers/comedi/drivers/vmk80xx.c:227 [inline]
vmk80xx_auto_attach+0xa1c/0x1a40 drivers/comedi/drivers/vmk80xx.c:818
comedi_auto_config+0x238/0x380 drivers/comedi/drivers.c:1067
usb_probe_interface+0x5cd/0xb00 drivers/usb/core/driver.c:399
...

Similar issue also found by Syzkaller:

Classification

CVE ID: CVE-2024-27001

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.04% (probability of being exploited)

EPSS Percentile: 15.26% (scored less or equal to compared to others)

EPSS Date: 2025-02-04 (when was this score calculated)

References

https://git.kernel.org/stable/c/3a63ae0348d990e137cca04eced5b08379969ea9
https://git.kernel.org/stable/c/a3b8ae7e9297dd453f2977b011c5bc75eb20e71b
https://git.kernel.org/stable/c/f15370e315976198f338b41611f37ce82af6cf54
https://git.kernel.org/stable/c/b0b268eeb087e324ef3ea71f8e6cabd07630517f
https://git.kernel.org/stable/c/ac882d6b21bffecb57bcc4486701239eef5aa67b
https://git.kernel.org/stable/c/59f33af9796160f851641d960bd93937f282c696
https://git.kernel.org/stable/c/6ec3514a7d35ad9cfab600187612c29f669069d2
https://git.kernel.org/stable/c/d1718530e3f640b7d5f0050e725216eab57a85d8

Timeline