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NVD / CVE Program· CNA Linux

CVE-2026-72483: usb: host: max3421: Fix shift-out-of-bounds in max3421_hub_control()

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.19% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 00dd025324b56d39d37e57a08f473dab3a660f30, 02d03c61e8a7b016956acb48e8a2512d16d87517, 08b1d4cab0230697bc74c63fc4e40170a7559c54.

Low priority for now. Upgrade to Linux Linux 00dd025324b56d39d37e57a08f473dab3a660f30, 02d03c61e8a7b016956acb48e8a2512d16d87517, 08b1d4cab0230697bc74c63fc4e40170a7559c54 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Aug 15, 2026
Updated
Aug 17, 2026
EPSS
0.1% · 9th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 3.16affected
    • 2d53139f31626bad6f8983d8e519ddde2cbba921 and later · before e5fa9d8f40746ec3447335c9642c03410f5fd3afaffected · git
    • 2d53139f31626bad6f8983d8e519ddde2cbba921 and later · before 08b1d4cab0230697bc74c63fc4e40170a7559c54affected · git
    • 2d53139f31626bad6f8983d8e519ddde2cbba921 and later · before 3be5f24e8270ba53b3c814d13689bb8644c86237affected · git
    • 2d53139f31626bad6f8983d8e519ddde2cbba921 and later · before d512bdefd241b98f4d7bcb5bab5614a86411fad4affected · git
    • 2d53139f31626bad6f8983d8e519ddde2cbba921 and later · before 00dd025324b56d39d37e57a08f473dab3a660f30affected · git
    • 2d53139f31626bad6f8983d8e519ddde2cbba921 and later · before 02d03c61e8a7b016956acb48e8a2512d16d87517affected · git
    • 2d53139f31626bad6f8983d8e519ddde2cbba921 and later · before 4da073d57176d8e1c2bca34febfbc81d2560c1a5affected · git
    • 2d53139f31626bad6f8983d8e519ddde2cbba921 and later · before cff06b03b530ae1fe8a13e93a7848f2130e00fb4affected · git
    • before 3.16not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
Debian:13linuxbefore 6.12.100-16.12.100-1
Debian:14linuxbefore 7.1.5-17.1.5-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-72481Aug 15, 2026 · iio: magnetometer: ak8975: fix potential kernel stack memory leak
    0Monitor
  • ← EarlierCVE-2026-72482Aug 15, 2026 · gpib: fix double decrement of descriptor_busy in command_ioctl()
    31Monitor
  • Later →CVE-2026-72484Aug 15, 2026 · staging: most: video: avoid double free on video register failure
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux00dd025324b56d39d37e57a08f473dab3a660f30Vendor (CNA)
Linux Linux02d03c61e8a7b016956acb48e8a2512d16d87517Vendor (CNA)
Linux Linux08b1d4cab0230697bc74c63fc4e40170a7559c54Vendor (CNA)
Linux Linux3be5f24e8270ba53b3c814d13689bb8644c86237Vendor (CNA)
Linux Linux4da073d57176d8e1c2bca34febfbc81d2560c1a5Vendor (CNA)
Linux Linuxcff06b03b530ae1fe8a13e93a7848f2130e00fb4Vendor (CNA)
Linux Linuxd512bdefd241b98f4d7bcb5bab5614a86411fad4Vendor (CNA)
Linux Linuxe5fa9d8f40746ec3447335c9642c03410f5fd3afVendor (CNA)
debian:linux6.1.180-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records