CVE-2026-86563

Incorrect memory access via double-offset log mapping

Published Oct 14, 2026 · Updated Oct 14, 2026

DPDK lib/vhost allows local users to cause incorrect memory access through a double-offset error in log mapping calculations. The calculation counts an offset twice; Red Hat does not publish the affected function or identify the resulting read or write operation. Exploitation requires low local privileges, but the advisory does not establish a specific crash mode or demonstrate code execution.

CVSS severity7.8
High
EPSS probability0.16%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DPDK lib/vhost allows local users to cause incorrect memory access through a double-offset error in log mapping calculations. The calculation counts an offset twice; Red Hat does not publish the affected function or identify the resulting read or write operation. Exploitation requires low local privileges, but the advisory does not establish a specific crash mode or demonstrate code execution.

The record

CVE
CVE-2026-86563
Published
Oct 14, 2026
Updated
Oct 14, 2026
Vendor
libuser Project
Product
Red Hat OpenShift Container Platform 4
Classifications
CWE-131
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

libuser Project · Red Hat OpenShift Container Platform 4Affected versions are unavailable in this record.
libuser Project · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
libuser Project · Red Hat OpenStack PlatformAffected versions are unavailable in this record.
libuser Project · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.
libuser Project · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
libuser Project · Fast Datapath for RHELAffected versions are unavailable in this record.

Published CVSS scores

7.8Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-131Incorrect Calculation of Buffer Size

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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