usb: host: max3421: Fix shift-out-of-bounds in max3421_hub_control()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72483
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:22 UTC
Updated2026-08-17 06:19:16 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001810000 probability, percentile 0.079810000 (date 2026-08-17)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2d53139f31626bad6f8983d8e519ddde2cbba921 e5fa9d8f40746ec3447335c9642c03410f5fd3af git Not specified
CNA Linux Linux affected 2d53139f31626bad6f8983d8e519ddde2cbba921 08b1d4cab0230697bc74c63fc4e40170a7559c54 git Not specified
CNA Linux Linux affected 2d53139f31626bad6f8983d8e519ddde2cbba921 3be5f24e8270ba53b3c814d13689bb8644c86237 git Not specified
CNA Linux Linux affected 2d53139f31626bad6f8983d8e519ddde2cbba921 d512bdefd241b98f4d7bcb5bab5614a86411fad4 git Not specified
CNA Linux Linux affected 2d53139f31626bad6f8983d8e519ddde2cbba921 00dd025324b56d39d37e57a08f473dab3a660f30 git Not specified
CNA Linux Linux affected 2d53139f31626bad6f8983d8e519ddde2cbba921 02d03c61e8a7b016956acb48e8a2512d16d87517 git Not specified
CNA Linux Linux affected 2d53139f31626bad6f8983d8e519ddde2cbba921 4da073d57176d8e1c2bca34febfbc81d2560c1a5 git Not specified
CNA Linux Linux affected 2d53139f31626bad6f8983d8e519ddde2cbba921 cff06b03b530ae1fe8a13e93a7848f2130e00fb4 git Not specified
CNA Linux Linux affected 3.16 Not specified
CNA Linux Linux unaffected 3.16 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/02d03c61e8a7b016956acb48e8a2512d16d87517 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d512bdefd241b98f4d7bcb5bab5614a86411fad4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/08b1d4cab0230697bc74c63fc4e40170a7559c54 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4da073d57176d8e1c2bca34febfbc81d2560c1a5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e5fa9d8f40746ec3447335c9642c03410f5fd3af 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3be5f24e8270ba53b3c814d13689bb8644c86237 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/00dd025324b56d39d37e57a08f473dab3a660f30 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cff06b03b530ae1fe8a13e93a7848f2130e00fb4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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