CVE-2026-86566

Dpdk: dpdk: guest with runt rx descriptors underflows copy length in vhost enqueue (split and packed rings)

CVSS score

6.5

EPSS probability

%0.1

Risk score

0.0

Published

4 d ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

A patch is available only for some products or versions

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Impact on My Inventory

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Vulnerability description

CVE AI research

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DayBreach AI Explanation

Verified against sources

DPDK vhost Vulnerability in CVE-2026-86566

Sources read

Source agreement

Tam uyum

Evidence confidence

%63

Short explanation

A vulnerability has been identified in the DPDK lib/vhost component due to improper length calculation. This flaw can cause a denial of service in shared vhost backends such as OVS-DPDK.

Why does it matter?

This vulnerability can trigger a denial of service in shared vhost backends, threatening the continuity of critical network infrastructure.

What should be done?

Follow the vendor advisories
Apply relevant updates

Chain of evidence and sources2 verified claims

DPDK lib/vhost bileşeninde, runt RX tanımlayıcılarına sahip bir konuk sistemin kopyalama uzunluğunu düşük akışa uğratabilmesi sonucu bir açık bulunmuştur.

S0 · daybreach-canonical S1 · cvelist S2 · nvd

Bu açık, OVS-DPDK gibi paylaşılan vhost arka uçlarında hizmet dışı kalmaya neden olmaktadır.

S0 · daybreach-canonical S1 · cvelist S2 · nvd

Show the technical text from the sources

A flaw was found in DPDK lib/vhost. A guest with runt RX descriptors can underflow the copy length in vhost enqueue, causing a denial of service in a shared vhost backend such as OVS-DPDK.

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

CWE: CWE-191

Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-86566 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	Red Hat	Fast Datapath for RHEL 10	View
2	Red Hat	Fast Datapath for RHEL 8	View
3	Red Hat	Fast Datapath for RHEL 9	View
4	Red Hat	Red Hat Enterprise Linux 10	View
5	Red Hat	Red Hat Enterprise Linux 8	View
6	Red Hat	Red Hat Enterprise Linux 9	View
7	Red Hat	Red Hat OpenShift Container Platform 4	View
8	Red Hat	Red Hat OpenStack Platform 13 (Queens)	View
9	debian	dpdk (sid)	View
10	debian	dpdk (forky)	View
11	debian	dpdk (trixie)	View
12	debian	dpdk (bookworm)	View

Total affected vendors: 2|Products: 12

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
6.5	CVSS V3_1	MEDIUM	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H	CVE CNA
6.5	CVSS V31	MEDIUM	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H	NVD

Patch and Remediation Guide

Solution & Remediation Advisory

Partial patch

1 düzeltme kanıtı bulundu; en az 3 ürün veya sürüm hâlâ etkileniyor ya da inceleniyor.

debiandpdk (sid)25.11.4-1

Debian sid: 25.11.4-1

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Apply the official update named in the evidence only to the matching product and version.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-86566 is associated with the following CWEs:

CWE-191: Common Weakness Enumeration Entry CWE-191

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-86566 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureYerel erişim

PermissionsLow

UserGerekmiyor

Official Sources and Advisories

https://access.redhat.com/security/cve/CVE-2026-86566vendor-advisory RHBZ#2529684vendor-advisory https://security-tracker.debian.org/tracker/CVE-2026-86566vendor-advisory

CVSS Vector Radar Chart

6.5 / 10

Vulnerability Scoring Details

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow privileges

User InteractionNone required

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)None

Availability (Erişilebilirlik)High

Kısmi yama

1 düzeltme kanıtı bulundu; en az 3 ürün veya sürüm hâlâ etkileniyor ya da inceleniyor.

Follow the vendor

Red Hat

debian

Weakness Type (CWE & CAPEC)

CWE-191

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