LiveActive security incident?Get immediate response
CVE Record

CVE-2024-43883: usb: vhci-hcd: Do not drop references before new references are gained

In the Linux kernel, the following vulnerability has been resolved: usb: vhci-hcd: Do not drop references before new references are gained At a few places the driver carries stale pointers to references that can still be used. Make sure that does not happen. This strictly speaking closes ZDI-CAN-22273, though there may be similar races in the driver.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2024-43883 is a Linux kernel bug in the USB/IP virtual host controller driver. The issue involves stale references in driver code, which can create race-condition behavior. The sources do not provide CVSS, impact details, or evidence of active exploitation, so urgency depends on whether affected kernels and this driver are present.

Executive priority

Treat as a kernel maintenance priority, not an emergency based on current evidence. Patch affected Linux fleets through normal vulnerability management, escalating systems that use USB/IP or run externally exposed, high-value workloads.

Technical view

The Linux vhci-hcd driver could drop references before gaining replacement references, leaving stale pointers that may still be used. The kernel fix addresses ZDI-CAN-22273, while noting similar races may exist. The provided affected data points to Linux kernel stable series requiring the referenced upstream fixes.

Likely exposure

Exposure is most likely on Linux systems running affected kernel versions with the USB/IP vhci-hcd driver available or used. The bundle does not identify specific distributions beyond Debian LTS advisories, nor does it confirm default enablement or remote reachability.

Exploitation context

The source bundle says KEV is false and provides no cited evidence of active exploitation. ZDI-CAN-22273 is referenced, indicating coordinated vulnerability handling, but the bundle does not describe exploit prerequisites, impact, or public weaponization.

Researcher notes

Key gaps are severity, CWE, exploitability, and impact. Analysis should focus on vhci-hcd reference lifetime and race handling around the stable commits. Do not assume privilege escalation, denial of service, or remote attack without additional vendor or researcher evidence.

Mitigation direction

  • Apply Linux kernel updates containing the referenced stable fixes.
  • Review Debian LTS advisories if running Debian-based systems.
  • Check vendor kernel advisories for exact fixed package versions.
  • Restrict or disable unused USB/IP functionality where operationally feasible.
  • Prioritize hosts exposing or relying on USB/IP workflows.

Validation and detection

  • Inventory kernel versions across Linux assets.
  • Check whether vhci-hcd or USB/IP modules are present or loaded.
  • Map systems to vendor fixed kernel packages or stable commits.
  • Confirm patched kernels after reboot, not only package installation.
  • Document exceptions where vendor guidance is not yet available.
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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2024-43883 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
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
2ADP providers
11Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

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

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux7606ee8aa33287dd3e6eb44c78541b87a413a325, 7606ee8aa33287dd3e6eb44c78541b87a413a325, 7606ee8aa33287dd3e6eb44c78541b87a413a325, 7606ee8aa33287dd3e6eb44c78541b87a413a325, 7606ee8aa33287dd3e6eb44c78541b87a413a325, 7606ee8aa33287dd3e6eb44c78541b87a413a325, 7606ee8aa33287dd3e6eb44c78541b87a413a325, 7606ee8aa33287dd3e6eb44c78541b87a413a325, 96ea4801d2035f89fc4ec4a67f49a18c35cb6715, 075b4e6a982d38121250c090f7b9294314ac1b19, 436e52f1a628233f080605dd736594df250897ca, 1c8d316294916da7e2a2f1f178ca3f3bd6d7b531, 927c3fa44e24300eb827ab9f9dacce6dff9c9bb7, 2.6.32.30, 2.6.33.8, 2.6.34.10, 2.6.35.12, 2.6.37.3unaffected
LinuxLinux2.6.38, 0, 4.19.320, 5.4.282, 5.10.224, 5.15.165, 6.1.105, 6.6.46, 6.10.5, 6.11affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.