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CVE-2026-71227— Libkcapi: infinite loop denial of service in libkcapi _kcapi_aio_read_all() due to unhandled io_getevents() timeout return

Quick assessment

Affected
Stephan Muelle libkcapi
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

chronox.de libkcapi是chronox.de团队的一个加密API组件库。 chronox.de libkcapi存在资源管理错误漏洞，该漏洞源于本地攻击者通过重用先前完成错误后的AIO句柄，导致_kcapi_aio_read_all()函数进入非终止等待循环，可能造成持久拒绝服务，使受影响的应用程序或线程无响应。

CVSS 5.1 · Medium EPSS 0.17% · P5

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 8

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 0:1.5.1-1.el10_2< * unaffected
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:1.5.0-6.el10_0< * unaffected
Red Hat Red Hat Enterprise Linux 8 0:1.4.0-3.el8_10< * unaffected
Red Hat Red Hat Enterprise Linux 9 0:1.4.0-3.el9_8< * unaffected
Red Hat Red Hat Hardened Images 1.5.1-0.1.hum1< * unaffected
Red Hat Red Hat OpenShift Container Platform 4 any affected
any affected
Stephan Muelle libkcapi 0.12.0< 1.5.1 affected
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I. Basic Information for CVE-2026-71227

Vulnerability Information
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Vulnerability Title
Libkcapi: infinite loop denial of service in libkcapi _kcapi_aio_read_all() due to unhandled io_getevents() timeout return
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
chronox.de libkcapi 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
chronox.de libkcapi是chronox.de团队的一个加密API组件库。 chronox.de libkcapi存在资源管理错误漏洞，该漏洞源于本地攻击者通过重用先前完成错误后的AIO句柄，导致_kcapi_aio_read_all()函数进入非终止等待循环，可能造成持久拒绝服务，使受影响的应用程序或线程无响应。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Stephan Muelle libkcapi 0.12.0 ~ 1.5.1 -
Red Hat Red Hat Enterprise Linux 10 0:1.5.1-1.el10_2 ~ * cpe:/o:redhat:enterprise_linux:10.2
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:1.5.0-6.el10_0 ~ * cpe:/o:redhat:enterprise_linux_eus:10.0
Red Hat Red Hat Enterprise Linux 8 0:1.4.0-3.el8_10 ~ * cpe:/o:redhat:enterprise_linux:8::baseos
Red Hat Red Hat Enterprise Linux 9 0:1.4.0-3.el9_8 ~ * cpe:/o:redhat:enterprise_linux:9::baseos
Red Hat Red Hat Hardened Images 1.5.1-0.1.hum1 ~ * cpe:/a:redhat:hummingbird:1
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-71227

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III. Intelligence Information for CVE-2026-71227

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Vendor Advisories for CVE-2026-71227 (7)

Same Patch Batch · Stephan Muelle · 2026-08-05 · 3 CVEs total

CVE-2026-71226 7.3 HIGH Libkcapi: memory corruption via uncanceled aio requests on error in libkcapi's one-shot ai
CVE-2026-71225 6.5 MEDIUM Libkcapi: iv reuse in libkcapi one-shot symmetric cipher chunking causes cipher state rese

IV. Related Vulnerabilities

Same product: libkcapi
Same vendor: Stephan Muelle
Same weakness: CWE-835

V. Comments for CVE-2026-71227

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