CVE-2021-46906

Summary

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().

Affected Software

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c5d3c142f2d57d40c55e65d5622d319125a45366affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 41b1e71a2c57366b08dcca1a28b0d45ca69429ceaffected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 8c064eece9a51856f3f275104520c7e3017fc5c0affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 0e280502be1b003c3483ae03fc60dea554fcfa82affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7f5a4b24cdbd7372770a02f23e347d7d9a9ac8f1affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < b1e3596416d74ce95cc0b7b38472329a3818f8a9affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 21883bff0fd854e07429a773ff18f1e9658f50e8affected
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 6be388f4a35d2ce5ef7dbf635a8964a5da7f799faffected
LinuxLinux2.6.12affected
LinuxLinux0 < 2.6.12unaffected
LinuxLinux4.4.274 <= 4.4.*unaffected
LinuxLinux4.9.274 <= 4.9.*unaffected
LinuxLinux4.14.238 <= 4.14.*unaffected
LinuxLinux4.19.196 <= 4.19.*unaffected
LinuxLinux5.4.127 <= 5.4.*unaffected
LinuxLinux5.10.45 <= 5.10.*unaffected
LinuxLinux5.12.12 <= 5.12.*unaffected
LinuxLinux5.13 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References