CVE-2026-43375

Service interruption via leaked USB device references

Published May 8, 2026 · Updated May 8, 2026

A device-reference leak in the Linux kernel MCTP USB driver allows local users to exhaust memory through repeated failed device probes. The probe path acquires an extra reference to the parent USB device but does not release it when driver binding fails. Exploitation requires local access able to trigger MCTP USB probe failures; accumulated references can interrupt service without disclosing or altering data.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A device-reference leak in the Linux kernel MCTP USB driver allows local users to exhaust memory through repeated failed device probes. The probe path acquires an extra reference to the parent USB device but does not release it when driver binding fails. Exploitation requires local access able to trigger MCTP USB probe failures; accumulated references can interrupt service without disclosing or altering data.

The record

CVE
CVE-2026-43375
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0791c0327a6e4e7691d6fc5ad334c215de04dcc9 <224a0d284c3caf1951302d1744a714784febed71
  2. Affected versionversion=0791c0327a6e4e7691d6fc5ad334c215de04dcc9 <3224990fb16a831aabc50b67c74f5d0074ce80dd
  3. Affected versionversion=0791c0327a6e4e7691d6fc5ad334c215de04dcc9 <ec9538f9b5cd1db5e8c612aa636b6119b6355c5d
  4. Affected versionversion=6.15

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0791c0327a6e4e7691d6fc5ad334c215de04dcc9 <224a0d284c3caf1951302d1744a714784febed71; version=0791c0327a6e4e7691d6fc5ad334c215de04dcc9 <3224990fb16a831aabc50b67c74f5d0074ce80dd; version=0791c0327a6e4e7691d6fc5ad334c215de04dcc9 <ec9538f9b5cd1db5e8c612aa636b6119b6355c5d; version=6.15

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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