CVE-2026-23365

Physical service interruption via unchecked USB endpoint binding

Published Mar 25, 2026 · Updated Mar 25, 2026

Improper endpoint validation in the Linux Kernel kalmia driver allows physically proximate attackers to crash the driver via a malicious USB device. The probe path binds before confirming the expected endpoint count and types, so later URB handling blindly accesses absent endpoint data. Physical USB access and an enabled kalmia driver are required; successful exploitation interrupts service without reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper endpoint validation in the Linux Kernel kalmia driver allows physically proximate attackers to crash the driver via a malicious USB device. The probe path binds before confirming the expected endpoint count and types, so later URB handling blindly accesses absent endpoint data. Physical USB access and an enabled kalmia driver are required; successful exploitation interrupts service without reported data disclosure or modification.

The record

CVE
CVE-2026-23365
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1200
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 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=3.0
  2. Affected versionversion=d40261236e8e278cb1936cb5e934262971692b10 <011684cd18349aa4c52167c8ac37a0524169f48c
  3. Affected versionversion=d40261236e8e278cb1936cb5e934262971692b10 <12c0243de0aee0ab27cc00932fd5edae65c1e3a2
  4. Affected versionversion=d40261236e8e278cb1936cb5e934262971692b10 <28a380bfa5bc7f6a9380b85e8eab919ee6ac1701
  5. Affected versionversion=d40261236e8e278cb1936cb5e934262971692b10 <51c20ea5f1555a984c041b0dbf56f00d41b9e652
  6. Affected versionversion=d40261236e8e278cb1936cb5e934262971692b10 <7bfda1a0be4caec3263753d567678451cef73a85
  7. Affected versionversion=d40261236e8e278cb1936cb5e934262971692b10 <c58b6c29a4c9b8125e8ad3bca0637e00b71e2693

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.0; version=d40261236e8e278cb1936cb5e934262971692b10 <011684cd18349aa4c52167c8ac37a0524169f48c; version=d40261236e8e278cb1936cb5e934262971692b10 <12c0243de0aee0ab27cc00932fd5edae65c1e3a2; version=d40261236e8e278cb1936cb5e934262971692b10 <28a380bfa5bc7f6a9380b85e8eab919ee6ac1701; version=d40261236e8e278cb1936cb5e934262971692b10 <51c20ea5f1555a984c041b0dbf56f00d41b9e652; version=d40261236e8e278cb1936cb5e934262971692b10 <7bfda1a0be4caec3263753d567678451cef73a85; version=d40261236e8e278cb1936cb5e934262971692b10 <c58b6c29a4c9b8125e8ad3bca0637e00b71e2693

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

T1200Hardware Additions

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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