Dpdk: dpdk: guest can trigger infinite loop in vhost-crypto writeback chain cleanup

Summary

CVE	CVE-2026-86847
State	PUBLISHED
Assigner	redhat
Source Priority	CVE Program / NVD first with legacy fallback
Published	2026-10-14 18:19:19 UTC
Updated	2026-10-20 02:17:13 UTC
Description	A flaw was found in DPDK lib/vhost vhost-crypto. Write-back chain cleanup can follow an uninitialized next pointer when mapping a guest descriptor fails, causing the host vhost-crypto process to hang or crash.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

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

EPSS: 0.001580000 probability, percentile 0.045590000 (date 2026-10-20)

Problem Types: CWE-824 | CWE-824 Access of Uninitialized Pointer

Version	Source	Type	Score	Severity	Vector
3.1	[email protected]	Secondary	6.5	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H`
3.1	CNA	CVSS	6.5	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H`

CVSS v3.1 Breakdown

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

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

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	Red Hat	Fast Datapath For RHEL 10	Not specified	Not specified
CNA	Red Hat	Fast Datapath For RHEL 10	Not specified	Not specified
CNA	Red Hat	Fast Datapath For RHEL 10	Not specified	Not specified
CNA	Red Hat	Fast Datapath For RHEL 8	Not specified	Not specified
CNA	Red Hat	Fast Datapath For RHEL 8	Not specified	Not specified
CNA	Red Hat	Fast Datapath For RHEL 8	Not specified	Not specified
CNA	Red Hat	Fast Datapath For RHEL 8	Not specified	Not specified
CNA	Red Hat	Fast Datapath For RHEL 8	Not specified	Not specified
CNA	Red Hat	Fast Datapath For RHEL 8	Not specified	Not specified
CNA	Red Hat	Fast Datapath For RHEL 8	Not specified	Not specified
CNA	Red Hat	Fast Datapath For RHEL 9	Not specified	Not specified
CNA	Red Hat	Fast Datapath For RHEL 9	Not specified	Not specified
CNA	Red Hat	Fast Datapath For RHEL 9	Not specified	Not specified
CNA	Red Hat	Fast Datapath For RHEL 9	Not specified	Not specified
CNA	Red Hat	Fast Datapath For RHEL 9	Not specified	Not specified
CNA	Red Hat	Fast Datapath For RHEL 9	Not specified	Not specified
CNA	Red Hat	Fast Datapath For RHEL 9	Not specified	Not specified
CNA	Red Hat	Fast Datapath For RHEL 9	Not specified	Not specified
CNA	Red Hat	Fast Datapath For RHEL 9	Not specified	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 10	Not specified	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 8	Not specified	Not specified
CNA	Red Hat	Red Hat Enterprise Linux 9	Not specified	Not specified
CNA	Red Hat	Red Hat OpenShift Container Platform 4	Not specified	Not specified
CNA	Red Hat	Red Hat OpenShift Container Platform 4	Not specified	Not specified
CNA	Red Hat	Red Hat OpenShift Container Platform 4	Not specified	Not specified
CNA	Red Hat	Red Hat OpenStack Platform 13 Queens	Not specified	Not specified

References

Reference	Source	Link	Tags
access.redhat.com/security/cve/CVE-2026-86847	[email protected]	access.redhat.com
bugzilla.redhat.com/show_bug.cgi	[email protected]	bugzilla.redhat.com
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Red Hat would like to thank Anthropic Research for reporting this issue. (en)

Additional Advisory Data

Source	Time	Event
CNA	2026-09-08T14:46:50.621Z	Reported to Red Hat.
CNA	2026-10-14T15:01:54.300Z	Made public.

Workarounds

CNA: Do not attach a virtio-crypto vhost-user backend to untrusted guests.

There are currently no legacy QID mappings associated with this CVE.