CVE-2024-41035: In the Linux kernel, the following vulnerability has been resolved: USB: core: Fix duplicate endpoint bug by clearing reserved bits in the descriptor...

Description

In the Linux kernel, the following vulnerability has been resolved: USB: core: Fix duplicate endpoint bug by clearing reserved bits in the descriptor Syzbot has identified a bug in usbcore (see the Closes: tag below) caused by our assumption that the reserved bits in an endpoint descriptor's bEndpointAddress field will always be 0. As a result of the bug, the endpoint_is_duplicate() routine in config.c (and possibly other routines as well) may believe that two descriptors are for distinct endpoints, even though they have the same direction and endpoint number. This can lead to confusion, including the bug identified by syzbot (two descriptors with matching endpoint numbers and directions, where one was interrupt and the other was bulk). To fix the bug, we will clear the reserved bits in bEndpointAddress when we parse the descriptor. (Note that both the USB-2.0 and USB-3.1 specs say these bits are "Reserved, reset to zero".) This requires us to make a copy of the descriptor earlier in usb_parse_endpoint() and use the copy instead of the original when checking for duplicates.

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.30%

21.5th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions	Update
Linux	Linux Kernel	>= 3.2.87, < 3.3	—
Linux	Linux Kernel	>= 3.10.106, < 3.11	—
Linux	Linux Kernel	>= 3.12.70, < 3.13	—
Linux	Linux Kernel	>= 3.16.42, < 3.17	—
Linux	Linux Kernel	>= 4.1.39, < 4.2	—
Linux	Linux Kernel	>= 4.4.42, < 4.5	—
Linux	Linux Kernel	>= 4.9.3, < 4.10	—
Linux	Linux Kernel	>= 4.10.1, < 4.19.318	—
Linux	Linux Kernel	>= 4.20, < 5.4.280	—
Linux	Linux Kernel	>= 5.5, < 5.10.222	—
Linux	Linux Kernel	>= 5.11, < 5.15.163	—
Linux	Linux Kernel	>= 5.16, < 6.1.100	—
Linux	Linux Kernel	>= 6.2, < 6.6.41	—
Linux	Linux Kernel	>= 6.7, < 6.9.10	—
Linux	Linux Kernel	4.10	—
Linux	Linux Kernel	6.10	Rc1

References

Timeline

Published: Jul 29, 2024
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2024-41035?

In the Linux kernel, the following vulnerability has been resolved: USB: core: Fix duplicate endpoint bug by clearing reserved bits in the descriptor Syzbot has identified a bug in usbcore (see the Closes: tag below) caused by our assumption that the reserved bits in an endpoint descriptor's bEndpointAddress field will always be 0. As a result of the bug, the endpoint_is_duplicate() routine in config.c (and possibly other routines as well) may believe that two descriptors are for distinct endpoints, even though they have the same direction and endpoint number. This can lead to confusion, including the bug identified by syzbot (two descriptors with matching endpoint numbers and directions, where one was interrupt and the other was bulk). To fix the bug, we will clear the reserved bits in bEndpointAddress when we parse the descriptor. (Note that both the USB-2.0 and USB-3.1 specs say these bits are "Reserved, reset to zero".) This requires us to make a copy of the descriptor earlier in usb_parse_endpoint() and use the copy instead of the original when checking for duplicates.

How severe is CVE-2024-41035?

CVE-2024-41035 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.30% probability of exploitation in the next 30 days.

How do I fix CVE-2024-41035?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.