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CVE Record

CVE-2026-23365: net: usb: kalmia: validate USB endpoints

In the Linux kernel, the following vulnerability has been resolved: net: usb: kalmia: validate USB endpoints The kalmia driver should validate that the device it is probing has the proper number and types of USB endpoints it is expecting before it binds to it. If a malicious device were to not have the same urbs the driver will crash later on when it blindly accesses these endpoints.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel USB driver flaw. A malicious USB device can present unexpected endpoint data to the kalmia network driver and later trigger a kernel crash. The business impact is most relevant where users, technicians, or adversaries can connect USB hardware to Linux systems.

Executive priority

Treat as a targeted denial-of-service risk, not a broad internet emergency. Prioritize patching Linux endpoints where untrusted USB devices can be connected, especially shared, field, lab, or operational systems.

Technical view

The kalmia USB network driver did not validate the number and type of USB endpoints before binding. The upstream fix adds endpoint validation to avoid later blind endpoint access. Sources describe a crash condition, not privilege escalation or remote compromise.

Likely exposure

Linux systems using kernels in the affected ranges and capable of binding the kalmia USB network driver are the likely exposure. Systems with disabled USB access or no relevant hardware path have lower practical exposure.

Exploitation context

The provided sources do not show active exploitation, and KEV is false. Exploitation appears to require a malicious or malformed USB device reaching a vulnerable Linux host, so physical or device-supply exposure matters most.

Researcher notes

Evidence supports a USB-triggered kernel crash from missing endpoint validation in the kalmia driver. No CVSS, CWE, exploit evidence, or detailed Siemens product impact is provided in the bundle, so avoid broader impact claims.

Mitigation direction

  • Apply the relevant Linux stable kernel update containing the kalmia endpoint validation fix.
  • Restrict untrusted USB device access on sensitive Linux systems.
  • Check Linux distribution advisories for packaged kernel availability and backport status.
  • Review the referenced Siemens advisories if Siemens products are in scope.

Validation and detection

  • Inventory Linux kernel versions against the affected version ranges in the CVE record.
  • Confirm whether the kalmia driver is present, loadable, or disabled on target systems.
  • Verify installed kernels include one of the referenced upstream stable fixes.
  • Review endpoint-control policies for exposed workstations, kiosks, and operational systems.
Prepared
Confidence
medium
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2026-23365 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
1ADP providers
11Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxd40261236e8e278cb1936cb5e934262971692b10, d40261236e8e278cb1936cb5e934262971692b10, d40261236e8e278cb1936cb5e934262971692b10, d40261236e8e278cb1936cb5e934262971692b10, d40261236e8e278cb1936cb5e934262971692b10, d40261236e8e278cb1936cb5e934262971692b10, d40261236e8e278cb1936cb5e934262971692b10, d40261236e8e278cb1936cb5e934262971692b10unaffected
LinuxLinux3.0, 0, 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.77, 6.18.17, 6.19.7, 7.0affected
Weakness

CWE details

No CWE listed

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