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PUBLISHED

CVE-2024-36895

usb: gadget: uvc: use correct buffer size when parsing configfs lists

Reserved:2024-05-30
Published:2024-05-30
Updated:2024-06-06

Description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: uvc: use correct buffer size when parsing configfs lists This commit fixes uvc gadget support on 32-bit platforms. Commit 0df28607c5cb ("usb: gadget: uvc: Generalise helper functions for reuse") introduced a helper function __uvcg_iter_item_entries() to aid with parsing lists of items on configfs attributes stores. This function is a generalization of another very similar function, which used a stack-allocated temporary buffer of fixed size for each item in the list and used the sizeof() operator to check for potential buffer overruns. The new function was changed to allocate the now variably sized temp buffer on heap, but wasn't properly updated to also check for max buffer size using the computed size instead of sizeof() operator. As a result, the maximum item size was 7 (plus null terminator) on 64-bit platforms, and 3 on 32-bit ones. While 7 is accidentally just barely enough, 3 is definitely too small for some of UVC configfs attributes. For example, dwFrameInteval, specified in 100ns units, usually has 6-digit item values, e.g. 166666 for 60fps.

Product status

Default status
unaffected

0df28607c5cb before 7a54e5052bde
affected

0df28607c5cb before a422089ce42c
affected

0df28607c5cb before 650ae71c8074
affected

Default status
affected

6.3
affected

Any version before 6.3
unaffected

6.6.31
unaffected

6.8.10
unaffected

6.9
unaffected

References

https://git.kernel.org/stable/c/7a54e5052bde582fd0e7677334fe7a5be92e242c

https://git.kernel.org/stable/c/a422089ce42ced73713e5032aad29a9a7cbe9528

https://git.kernel.org/stable/c/650ae71c80749fc7cb8858c8049f532eaec64410

cve.org CVE-2024-36895

nvd.nist.gov CVE-2024-36895

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