DPDK vhost-crypto OOB Write via Unchecked Avail-Ring Index
CVE-2026-86846 Published on October 14, 2026

Dpdk: dpdk: guest can trigger out-of-bounds write by controlling avail ring index in vhost-crypto
A flaw was found in DPDK lib/vhost vhost-crypto. A guest can supply an avail-ring descriptor index that is used without bounds checking, causing an out-of-bounds write in the host vhost-crypto backend.

NVD

Vulnerability Analysis

CVE-2026-86846 is exploitable with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Attack Vector:
LOCAL
Attack Complexity:
LOW
Privileges Required:
LOW
User Interaction:
NONE
Scope:
CHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH

Timeline

Reported to Red Hat.

Made public. 36 days later.

Weakness Type

What is a Memory Corruption Vulnerability?

The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.

CVE-2026-86846 has been classified to as a Memory Corruption vulnerability or weakness.


Products Associated with CVE-2026-86846

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Red Hat Enterprise Linux (RHEL)
 
Red Hat Openshift
 
Red Hat Openstack
 

Affected Versions

Red Hat Fast Datapath for RHEL 10: Red Hat Fast Datapath for RHEL 10: Red Hat Fast Datapath for RHEL 10: Red Hat Fast Datapath for RHEL 8: Red Hat Fast Datapath for RHEL 8: Red Hat Fast Datapath for RHEL 8: Red Hat Fast Datapath for RHEL 8: Red Hat Fast Datapath for RHEL 8: Red Hat Fast Datapath for RHEL 8: Red Hat Fast Datapath for RHEL 8: Red Hat Fast Datapath for RHEL 9: Red Hat Fast Datapath for RHEL 9: Red Hat Fast Datapath for RHEL 9: Red Hat Fast Datapath for RHEL 9: Red Hat Fast Datapath for RHEL 9: Red Hat Fast Datapath for RHEL 9: Red Hat Fast Datapath for RHEL 9: Red Hat Fast Datapath for RHEL 9: Red Hat Fast Datapath for RHEL 9: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 9: Red Hat OpenShift Container Platform 4: Red Hat OpenShift Container Platform 4: Red Hat OpenShift Container Platform 4: Red Hat OpenStack Platform 13 (Queens):