CVE-2026-72483usb: host: max3421: Fix shift-out-of-bounds in max3421_hub_control()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 2d53139f31626bad6f8983d8e519ddde2cbba921 before e5fa9d8f40746ec3447335c9642c03410f5fd3af; from 2d53139f31626bad6f8983d8e519ddde2cbba921 before 08b1d4cab0230697bc74c63fc4e40170a7559c54; from 2d53139f31626bad6f8983d8e519ddde2cbba921 before 3be5f24e8270ba53b3c814d13689bb8644c86237; from 2d53139f31626bad6f8983d8e519ddde2cbba921 before d512bdefd241b98f4d7bcb5bab5614a86411fad4; 2d53139f31626bad6f8983d8e519ddde2cbba921 builds before 00dd025324b56d39d37e57a08f473dab3a660f30; 2d53139f31626bad6f8983d8e519ddde2cbba921 builds before 02d03c61e8a7b016956acb48e8a2512d16d87517; from 2d53139f31626bad6f8983d8e519ddde2cbba921 before 4da073d57176d8e1c2bca34febfbc81d2560c1a5; from 2d53139f31626bad6f8983d8e519ddde2cbba921 before cff06b03b530ae1fe8a13e93a7848f2130e00fb4 | CNA record |
References
- https://git.kernel.org/stable/c/e5fa9d8f40746ec3447335c9642c03410f5fd3af
- https://git.kernel.org/stable/c/08b1d4cab0230697bc74c63fc4e40170a7559c54
- https://git.kernel.org/stable/c/3be5f24e8270ba53b3c814d13689bb8644c86237
- https://git.kernel.org/stable/c/d512bdefd241b98f4d7bcb5bab5614a86411fad4
- https://git.kernel.org/stable/c/00dd025324b56d39d37e57a08f473dab3a660f30
- https://git.kernel.org/stable/c/02d03c61e8a7b016956acb48e8a2512d16d87517
- https://git.kernel.org/stable/c/4da073d57176d8e1c2bca34febfbc81d2560c1a5
- https://git.kernel.org/stable/c/cff06b03b530ae1fe8a13e93a7848f2130e00fb4
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.