CVE-2026-72483: Linux Vulnerability (CVSS 7.8)

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.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.24%

15.1th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 2d53139f31626bad6f8983d8e519ddde2cbba921, < e5fa9d8f40746ec3447335c9642c03410f5fd3af; >= 2d53139f31626bad6f8983d8e519ddde2cbba921, < 08b1d4cab0230697bc74c63fc4e40170a7559c54; >= 2d53139f31626bad6f8983d8e519ddde2cbba921, < 3be5f24e8270ba53b3c814d13689bb8644c86237; >= 2d53139f31626bad6f8983d8e519ddde2cbba921, < d512bdefd241b98f4d7bcb5bab5614a86411fad4; >= 2d53139f31626bad6f8983d8e519ddde2cbba921, < 00dd025324b56d39d37e57a08f473dab3a660f30; >= 2d53139f31626bad6f8983d8e519ddde2cbba921, < 02d03c61e8a7b016956acb48e8a2512d16d87517; >= 2d53139f31626bad6f8983d8e519ddde2cbba921, < 4da073d57176d8e1c2bca34febfbc81d2560c1a5; >= 2d53139f31626bad6f8983d8e519ddde2cbba921, < cff06b03b530ae1fe8a13e93a7848f2130e00fb4
Linux	Linux	3.16

References

Timeline

Published: Aug 15, 2026
Last Modified: Aug 17, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-72483?

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 severe is CVE-2026-72483?

CVE-2026-72483 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.24% probability of exploitation in the next 30 days.

How do I fix CVE-2026-72483?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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