CVE-2026-72483
Description
In the Linux kernel, the following vulnerability has been resolved: usb: host: max3421: Fix shift-out-of-bounds in max3421_hub_control() The `max3421_hub_control()` function handles USB hub class requests to the virtual root hub. In the `default` branches of both the `ClearPortFeature` and `SetPortFeature` switch statements, it modifies `max3421_hcd->port_status` by left shifting 1 by the request's `value` parameter. However, it does not validate whether this shift will exceed the width of `port_status`. So if a malicious userspace task with access to the root hub via /dev/bus/usb/.../001 issues a USBDEVFS_CONTROL ioctl with `wValue` greater than or equal to 32, the left shift operation invokes shift-out-of-bounds undefined behavior. This results in arbitrary bit corruption of `port_status`, including the normally-immutable change bits, which can bypass internal state checks and confuse the hub status. Fix this by rejecting requests whose `value` exceeds the shift width before performing the shift. This issue was found using a KLEE-based symbolic execution tool for kernel drivers that I'm currently developing.
How to fix
- Linux Linuxe5fa9d8f40746ec3447335c9642c03410f5fd3af, 08b1d4cab0230697bc74c63fc4e40170a7559c54, 3be5f24e8270ba53b3c814d13689bb8644c86237, d512bdefd241b98f4d7bcb5bab5614a86411fad4, 00dd025324b56d39d37e57a08f473dab3a660f30, 02d03c61e8a7b016956acb48e8a2512d16d87517, 4da073d57176d8e1c2bca34febfbc81d2560c1a5, cff06b03b530ae1fe8a13e93a7848f2130e00fb4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 2d53139f31626bad6f8983d8e519ddde2cbba921 ≤ v < e5fa9d8f40746ec3447335c9642c03410f5fd3af, 2d53139f31626bad6f8983d8e519ddde2cbba921 ≤ v < 08b1d4cab0230697bc74c63fc4e40170a7559c54, 2d53139f31626bad6f8983d8e519ddde2cbba921 ≤ v < 3be5f24e8270ba53b3c814d13689bb8644c86237, 2d53139f31626bad6f8983d8e519ddde2cbba921 ≤ v < d512bdefd241b98f4d7bcb5bab5614a86411fad4, 2d53139f31626bad6f8983d8e519ddde2cbba921 ≤ v < 00dd025324b56d39d37e57a08f473dab3a660f30, 2d53139f31626bad6f8983d8e519ddde2cbba921 ≤ v < 02d03c61e8a7b016956acb48e8a2512d16d87517, 2d53139f31626bad6f8983d8e519ddde2cbba921 ≤ v < 4da073d57176d8e1c2bca34febfbc81d2560c1a5, 2d53139f31626bad6f8983d8e519ddde2cbba921 ≤ v < cff06b03b530ae1fe8a13e93a7848f2130e00fb4, 3.16 | e5fa9d8f40746ec3447335c9642c03410f5fd3af, 08b1d4cab0230697bc74c63fc4e40170a7559c54, 3be5f24e8270ba53b3c814d13689bb8644c86237, d512bdefd241b98f4d7bcb5bab5614a86411fad4, 00dd025324b56d39d37e57a08f473dab3a660f30, 02d03c61e8a7b016956acb48e8a2512d16d87517, 4da073d57176d8e1c2bca34febfbc81d2560c1a5, cff06b03b530ae1fe8a13e93a7848f2130e00fb4 |
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