CVE-2021-46906
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.
Does this matter?
Lower severity and a low EPSS score (0.24%). Track it; it rarely justifies an emergency change on its own.
Description
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().
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 0.24% probability · 16th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-668
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0e280502be1b003c3483ae03fc60dea554fcfa82Patch
- https://git.kernel.org/stable/c/21883bff0fd854e07429a773ff18f1e9658f50e8Patch
- https://git.kernel.org/stable/c/41b1e71a2c57366b08dcca1a28b0d45ca69429cePatch
- https://git.kernel.org/stable/c/6be388f4a35d2ce5ef7dbf635a8964a5da7f799fPatch
- https://git.kernel.org/stable/c/7f5a4b24cdbd7372770a02f23e347d7d9a9ac8f1Patch
- https://git.kernel.org/stable/c/8c064eece9a51856f3f275104520c7e3017fc5c0Patch
- https://git.kernel.org/stable/c/b1e3596416d74ce95cc0b7b38472329a3818f8a9Patch
- https://git.kernel.org/stable/c/c5d3c142f2d57d40c55e65d5622d319125a45366Patch
- https://git.kernel.org/stable/c/0e280502be1b003c3483ae03fc60dea554fcfa82Patch
- https://git.kernel.org/stable/c/21883bff0fd854e07429a773ff18f1e9658f50e8Patch
- https://git.kernel.org/stable/c/41b1e71a2c57366b08dcca1a28b0d45ca69429cePatch
- https://git.kernel.org/stable/c/6be388f4a35d2ce5ef7dbf635a8964a5da7f799fPatch
- https://git.kernel.org/stable/c/7f5a4b24cdbd7372770a02f23e347d7d9a9ac8f1Patch
- https://git.kernel.org/stable/c/8c064eece9a51856f3f275104520c7e3017fc5c0Patch
- https://git.kernel.org/stable/c/b1e3596416d74ce95cc0b7b38472329a3818f8a9Patch
- https://git.kernel.org/stable/c/c5d3c142f2d57d40c55e65d5622d319125a45366Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.