Libkcapi: infinite loop denial of service in libkcapi _kcapi_aio_read_all() due to unhandled io_getevents() timeout return
CVSS score
5.1
EPSS probability
%0.2
Risk score
0.0
Published
2 mo ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
1
Source agreement
Tam uyum
Evidence confidence
%53
Short explanation
A medium-severity denial of service vulnerability exists in libkcapi of Red Hat Enterprise Linux 8, 9, 10, and OpenShift Container Platform 4. A local attacker can trigger an infinite loop via improper AIO handle reuse, leading to persistent application unresponsiveness. Patch status is UNKNOWN due to lack of reliable public information.
This vulnerability enables persistent denial of service in critical system components. While not leading to privilege escalation, it can disrupt service availability in enterprise environments using Red Hat Enterprise Linux or OpenShift. Patch status is UNKNOWN, requiring vendor advisory monitoring.
What should be done?
- Monitor for signs of application unresponsiveness.
- Apply vendor-recommended updates if available.
- No fixed version is publicly documented; follow vendor advisories for updates.
The sources give limited detail on some technical conditions. Review the chain of evidence below before deciding how to act.
Chain of evidence and sources
Red Hat Enterprise Linux 8, 9, 10 ve Red Hat OpenShift Container Platform 4'de libkcapi'nin _kcapi_aio_read_all() fonksiyonunda io_getevents() zaman aşımı hatası olmadan işlenmesi nedeniyle ortaya çıkan bir orta şiddetli reddedilen hizmet (DoS) açıklığı vardır. Yerel bir saldırıcının bu durumu tetikleyerek, uygulamanın sürekli olarak yanıt veremeyeceği bir döngüye girmesini sağlayabilir.
Bir yerel saldırıcının, önceki bir tamamlama hatası sonrası AIO etkin bir eli yeniden kullanmasıyla, _kcapi_aio_read_all() fonksiyonunda sonsuz bir döngüye girmesini sağlayarak bir reddedilen hizmet (DoS) tetikleyebilir.
Resmî bir yama durumu mevcut değildir. Paylaşılan kaynaklarda güvenilir bilgi yok olduğu için yama durumu BİLİNMEYEN (UNKNOWN) olarak belirtilmiştir.
Show the technical text from the sources
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.
CVSS vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE: CWE-835
Explanation produced with the local qwen3:4b-instruct model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-71227 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | Stephan Muelle | libkcapi | View |
| 2 | Red Hat | Red Hat Enterprise Linux 10 | View |
| 3 | Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | View |
| 4 | Red Hat | Red Hat Enterprise Linux 8 | View |
| 5 | Red Hat | Red Hat Enterprise Linux 9 | View |
| 6 | Red Hat | Red Hat Hardened Images | View |
| 7 | Red Hat | Red Hat OpenShift Container Platform 4 | View |
| 8 | redhat | hardened images | View |
| 9 | redhat | openshift container platform | View |
| 10 | smuellerdd | libkcapi | View |
| 11 | redhat | enterprise linux | View |
| 12 | redhat | enterprise linux | View |
| 13 | redhat | enterprise linux | View |
| 14 | debian | libkcapi (sid) | View |
| 15 | debian | libkcapi (forky) | View |
| 16 | debian | libkcapi (trixie) | View |
| 17 | debian | libkcapi (bookworm) | View |
| 18 | debian | libkcapi (bullseye) | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 5.1 | CVSS V31 | MEDIUM | CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H | NVD |
| 5.1 | CVSS V3_1 | MEDIUM | CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H | CVE CNA |
| 5.1 | CVSS 3.x | — | CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H | Microsoft MSRC |
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-71227 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-71227 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
CVSS Vector Radar Chart
5.1 / 10Vulnerability Scoring Details
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Type (CWE & CAPEC)
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