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CVE Record

CVE-2026-46103: can: ucan: fix devres lifetime

In the Linux kernel, the following vulnerability has been resolved: can: ucan: fix devres lifetime USB drivers bind to USB interfaces and any device managed resources should have their lifetime tied to the interface rather than parent USB device. This avoids issues like memory leaks when drivers are unbound without their devices being physically disconnected (e.g. on probe deferral or configuration changes). Fix the control message buffer lifetime so that it is released on driver unbind.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel bug in the UCAN USB-CAN driver. The reported issue is resource lifetime handling: a control message buffer may not be released when the driver is unbound without physically disconnecting the USB device. The business impact appears mainly operational reliability and resource leakage, not confirmed compromise.

Executive priority

Treat as routine patch management unless UCAN USB-CAN devices are operationally important. There is no sourced evidence of active exploitation or high-impact compromise, but affected systems should receive normal kernel maintenance updates.

Technical view

The fix changes device-managed resource ownership so UCAN driver resources are tied to the USB interface rather than the parent USB device. This releases the control message buffer on driver unbind, avoiding leaks during unbind paths such as probe deferral or configuration changes. No CVSS, CWE, or exploitability details are provided.

Likely exposure

Exposure is most likely on Linux systems using the UCAN USB-CAN driver or related USB CAN hardware workflows. The source lists Linux kernel versions and stable commits, but distribution backport status must be checked with the OS vendor.

Exploitation context

The source bundle does not report active exploitation, and KEV status is false. The public description frames this as a memory leak/lifetime bug during driver unbind, not as a demonstrated privilege escalation or remote attack path.

Researcher notes

Evidence is limited to the kernel CVE description and stable commit references. The root issue is devres lifetime scoping in a USB interface driver. Further assessment should focus on affected kernel trees, vendor backports, and whether local driver unbind behavior can cause meaningful service impact.

Mitigation direction

  • Apply a vendor kernel update that includes the referenced stable fix.
  • Check Linux distribution advisories and package changelogs for CVE-2026-46103.
  • Prioritize systems using UCAN USB-CAN hardware or driver workflows.
  • Avoid unnecessary UCAN driver binding or reconfiguration until patched.

Validation and detection

  • Inventory Linux systems that use UCAN or USB-CAN interfaces.
  • Compare installed kernel packages against vendor guidance for this CVE.
  • Confirm kernel source or changelog includes one referenced stable commit.
  • Review operational exposure to driver unbind, probe deferral, or configuration changes.
Prepared
Confidence
medium
Sources
8

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

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CVE-2026-46103 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
0ADP providers
7Source 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.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux9f2d3eae88d26c29d96e42983b755940d9169cd9, 9f2d3eae88d26c29d96e42983b755940d9169cd9, 9f2d3eae88d26c29d96e42983b755940d9169cd9, 9f2d3eae88d26c29d96e42983b755940d9169cd9, 9f2d3eae88d26c29d96e42983b755940d9169cd9, 9f2d3eae88d26c29d96e42983b755940d9169cd9unaffected
LinuxLinux4.19, 0, 6.1.175, 6.6.140, 6.12.86, 6.18.27, 7.0.4, 7.1affected
Weakness

CWE details

No CWE listed

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