---
id: CVE-2026-71227
title: A flaw was found in libkcapi
summary: >-
  A flaw was found in libkcapi. A local attacker can influence an application
  that uses the Asynchronous Input/Output (AIO) interface. By reusing an
  AIO-enabled handle after a prior completion error, the _kcapi_aio_read_all()
  function can …
severity: medium
cvss: 5.1
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-835
vendor: redhat
product: hardened_images
affected:
  - hardened_images
  - openshift_container_platform = 4.0
  - 'libkcapi >= 0.12.0, < 1.5.1'
  - enterprise_linux = 8.0
  - enterprise_linux = 9.0
  - enterprise_linux = 10.0
patched:
  - libkcapi 1.5.1
published: '2026-08-05'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T13:17:10.180'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-71227'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:56985'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:67265'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:67266'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:67267'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:69285'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-71227'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2462867'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-71227.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-71227'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-71227'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-08-05T13:10:05.043014Z'
epss: 0.00165
epssPercentile: 0.04989
ingestedAt: '2026-08-10T10:39:35.865Z'
---

## Overview

A flaw was found in libkcapi. A local attacker can influence an application that uses the Asynchronous Input/Output (AIO) interface. By reusing an AIO-enabled handle after a prior completion error, the _kcapi_aio_read_all() function can enter a non-terminating wait loop. This can lead to a persistent denial of service, making the affected application or thread unresponsive.

## Affected

- `hardened_images`
- `openshift_container_platform = 4.0`
- `libkcapi >= 0.12.0, < 1.5.1`
- `enterprise_linux = 8.0`
- `enterprise_linux = 9.0`
- `enterprise_linux = 10.0`

## Remediation

Upgrade past the affected range:

- `libkcapi 1.5.1`

## Vendor advisories

- **RHSA-2026:67267** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 10) · released 2026-09-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:67267)
- **RHSA-2026:67266** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8) · released 2026-09-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:67266)
- **RHSA-2026:67265** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 9) · released 2026-09-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:67265)
- **RHSA-2026:56985** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-08-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:56985)
- **Red Hat VEX** · Moderate · affected: Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat OpenShift Container Platform 4 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-71227.json)
- **RHSA-2026:69285** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS EUS (v. 10.0) · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69285)