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PatchSiren cyber security CVE debrief

CVE-2026-86847 Red Hat CVE debrief

A flaw in DPDK's vhost-crypto can cause an infinite loop when a guest triggers writeback chain cleanup, potentially crashing or hanging the host vhost-crypto process. This issue is relevant to administrators and security teams managing Red Hat Enterprise Linux, OpenShift Container Platform, and OpenStack Platform environments that utilize DPDK. The vulnerability's impact is primarily on the availability of affected systems, as it can lead to a denial of service. Exploitation requires local access and specific conditions to be met. Red Hat has provided advisories and patches for affected products.

Vendor
Red Hat
Product
Fast Datapath for RHEL 10
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-14
Original CVE updated
2026-10-14
Advisory published
2026-10-14
Advisory updated
2026-10-14

Who should care

Administrators and security teams managing Red Hat Enterprise Linux, OpenShift Container Platform, and OpenStack Platform environments that utilize DPDK should assess their exposure to this vulnerability and apply patches or mitigations as necessary.

Why it matters

CVE-2026-86847 is a medium-severity vulnerability in DPDK's vhost-crypto that can cause a denial of service. It requires local access and specific conditions to be exploited. Affected Red Hat products include Enterprise Linux, OpenShift Container Platform, and OpenStack Platform. Patching is recommended.

  • Denial of service due to potential process hang or crash
  • Need for patch application or mitigation to prevent exploitation
  • Potential for increased log volume and monitoring complexity
  • Requirement for inventory checks and verification of affected systems

Technical summary

The vulnerability is caused by an uninitialized next pointer in the writeback chain cleanup of DPDK's vhost-crypto. This can lead to an infinite loop when a guest triggers the cleanup, causing the host vhost-crypto process to hang or crash. The issue affects Red Hat Enterprise Linux, OpenShift Container Platform, and OpenStack Platform environments that utilize DPDK. Administrators and security teams managing these environments should assess their exposure and apply patches or mitigations as necessary. The vulnerability's impact is primarily on the availability of

Defensive priority

Medium priority due to potential for denial of service in critical infrastructure

Recommended defensive actions

  • Assess exposure of Red Hat Enterprise Linux, OpenShift Container Platform, and OpenStack Platform environments to this vulnerability
  • Apply patches provided by Red Hat for affected products
  • Monitor system logs for signs of potential exploitation attempts
  • Consider implementing compensating controls to mitigate potential impact

Evidence notes

The CVE and NVD records provide details on the vulnerability, its impact, and affected configurations. Red Hat has documented this issue in their security advisory.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-86847 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-86847

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-86847 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-86847

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.