UBUNTU-CVE-2021-46906

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UBUNTU-CVE-2021-46906

Summary:

Details: In the Linux kernel, the following vulnerability has been resolved: HID: usbhid: fix info leak in hid_submit_ctrl In hid_submit_ctrl(), the way of calculating the report length doesn't take into account that report->size can be zero. When running the syzkaller reproducer, a report of size 0 causes hid_submit_ctrl) to calculate transfer_buffer_length as 16384. When this urb is passed to the usb core layer, KMSAN reports an info leak of 16384 bytes. To fix this, first modify hid_report_len() to account for the zero report size case by using DIV_ROUND_UP for the division. Then, call it from hid_submit_ctrl().

References: https://ubuntu.com/security/CVE-2021-46906, https://git.kernel.org/linus/6be388f4a35d2ce5ef7dbf635a8964a5da7f799f, https://git.kernel.org/stable/c/c5d3c142f2d57d40c55e65d5622d319125a45366, https://git.kernel.org/stable/c/41b1e71a2c57366b08dcca1a28b0d45ca69429ce, https://git.kernel.org/stable/c/8c064eece9a51856f3f275104520c7e3017fc5c0, https://git.kernel.org/stable/c/0e280502be1b003c3483ae03fc60dea554fcfa82, https://git.kernel.org/stable/c/7f5a4b24cdbd7372770a02f23e347d7d9a9ac8f1, https://git.kernel.org/stable/c/b1e3596416d74ce95cc0b7b38472329a3818f8a9, https://git.kernel.org/stable/c/21883bff0fd854e07429a773ff18f1e9658f50e8, https://git.kernel.org/stable/c/6be388f4a35d2ce5ef7dbf635a8964a5da7f799f, https://www.cve.org/CVERecord?id=CVE-2021-46906, https://ubuntu.com/security/notices/USN-6976-1