LiveActive security incident?Get immediate response
CVE Record

CVE-2024-27067: xen/evtchn: avoid WARN() when unbinding an event channel

In the Linux kernel, the following vulnerability has been resolved: xen/evtchn: avoid WARN() when unbinding an event channel When unbinding a user event channel, the related handler might be called a last time in case the kernel was built with CONFIG_DEBUG_SHIRQ. This might cause a WARN() in the handler. Avoid that by adding an "unbinding" flag to struct user_event which will short circuit the handler.

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

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue affects Xen event-channel cleanup. Under a specific debug IRQ configuration, unbinding a user event channel can trigger an unexpected kernel WARN. The public record does not describe data exposure, remote attack, or confirmed service impact.

Executive priority

Handle through normal kernel patch management unless Xen workloads are business-critical or kernel WARN behavior affects availability policy. There is no source-backed evidence of active exploitation or broad remote exposure.

Technical view

The vulnerability is in Linux xen/evtchn user event-channel unbind handling. If CONFIG_DEBUG_SHIRQ is enabled, the handler may run one last time during unbind and hit a WARN. The fix adds an unbinding flag to struct user_event so the handler exits early.

Likely exposure

Exposure appears limited to Linux systems using Xen event channels, especially kernels built with CONFIG_DEBUG_SHIRQ. Internet-facing exposure is not indicated. Version data in the source bundle is partly commit-based, so distro kernel mapping needs vendor confirmation.

Exploitation context

The source bundle does not report active exploitation, public exploitation, or KEV listing. It describes a kernel WARN condition during event-channel unbinding, not a documented remote exploit path.

Researcher notes

Impact evidence is narrow: WARN during user event-channel unbind with CONFIG_DEBUG_SHIRQ. The record lacks CVSS, CWE, exploit status, and detailed privilege requirements. Validate affectedness through exact kernel source or vendor backport metadata.

Mitigation direction

  • Review Linux distribution advisories for CVE-2024-27067 and Xen kernel packages.
  • Prioritize updates on Xen hosts or guests using user event channels.
  • Apply vendor kernel updates containing the referenced stable fixes.
  • Avoid treating upstream version strings as final for backported distro kernels.

Validation and detection

  • Inventory Linux kernels running with Xen support or Xen guest workloads.
  • Check whether kernels include the referenced stable commits or distro backports.
  • Review kernel configuration for CONFIG_DEBUG_SHIRQ where available.
  • Search logs for WARN events related to xen/evtchn during channel unbind operations.
Prepared
Confidence
medium
Sources
6

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-2024-27067 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
5Source 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
LinuxLinux3c8f5965a99397368d3762a9814a21a3e442e1a4, 9e90e58c11b74c2bddac4b2702cf79d36b981278, 9e90e58c11b74c2bddac4b2702cf79d36b981278, 9e90e58c11b74c2bddac4b2702cf79d36b981278, 6.6.19unaffected
LinuxLinux6.7, 0, 6.6.23, 6.7.11, 6.8.2, 6.9affected
Weakness

CWE details

No CWE listed

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