Red Hat Enterprise Linux vhost out-of-bounds

Summaryinfo

A vulnerability marked as problematic has been reported in Red Hat Enterprise Linux, Fast Datapath, OpenShift Container Platform and OpenStack Platform. Affected is an unknown function of the component vhost. This manipulation causes out-of-bounds. This vulnerability is tracked as CVE-2026-93683. The attack is restricted to local execution. No exploit exists.

Detailsinfo

A vulnerability classified as problematic was found in Red Hat Enterprise Linux, Fast Datapath, OpenShift Container Platform and OpenStack Platform (the affected version is unknown). Affected by this vulnerability is an unknown code of the component vhost. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

A flaw was found in the DPDK vhost library. When handling a virtio indirect descriptor table, the host reads the table length more than once from guest memory and can allocate a host copy before validating that length. A guest that changes the length between those reads, or that supplies an out-of-range next index on a small host copy in the vDPA relay path, can cause the host vhost process to walk past the validated mapping or heap copy. That can crash or disrupt the vhost process. Out-of-bounds bytes are consumed as descriptor fields for GPA translation and are not returned to the guest as payload. This is a residual issue in the non-contiguous indirect descriptor copy path introduced as part of the CVE-2018-1059 fix.

It is possible to read the advisory at access.redhat.com. This vulnerability is known as CVE-2026-93683 since 09/18/2026. The exploitation appears to be easy. Attacking locally is a requirement. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/14/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Red Hat

Name

• Enterprise Linux
• Fast Datapath
• OpenShift Container Platform
• OpenStack Platform

License

• commercial

Website

• Vendor: https://www.redhat.com/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion