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Unrated severityNVD Advisory· Published Jul 29, 2024· Updated Nov 3, 2025

USB: core: Fix duplicate endpoint bug by clearing reserved bits in the descriptor

CVE-2024-41035

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.

Affected products

157

Patches

8
60abea505b72
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
d8418fd083d1
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
a368ecde8a50
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
37514a5c1251
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
647d61aef106
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
9edcf317620d
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
2bd8534a1b83
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
d09dd21bb521
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit

Vulnerability mechanics

Generated on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

8

News mentions

0

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