VulnTideExploited vulnerabilities, by vendor. Data as of .
Not in CISA KEVPublished CVSS 5.1 mediumEPSS 0.2% probability of exploitation in 30 daysFound by AI: AISLE
Red Hat

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

Is it exploited?

Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of . If CISA adds it, this page shows it as known exploited.

How likely is exploitation in the next 30 days?
0.2%

EPSS score, percentile 9.4 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?
5.1 Medium

CVSS v3.1 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (6)

Which versions are affected?

Affected

  • from 0.12.0 to before 1.5.1

Unaffected 0:1.5.1-1.el10_2; 0:1.5.0-6.el10_0; 0:1.4.0-3.el8_10; 0:1.4.0-3.el9_8; 0:1.4.0-2.el9_6.1; 1.5.1-0.1.hum1

Versions by product

Source: CISA KEV 2026.10.29, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.

What to do

Workaround (from the CVE record)

To mitigate this issue, applications should avoid initializing `libkcapi` handles with `KCAPI_INIT_AIO` if AIO functionality is not strictly required. If AIO must be used, applications should destroy and reinitialize `libkcapi` handles after any AIO completion error, rather than reusing them for subsequent AIO operations.

Advisories and patches

This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

As listed in the CVE record.

Stephan Muelle libkcapi
StatusVersions
Affectedfrom 0.12.0 to before 1.5.1

Versions not listed are: unaffected.

Red Hat Red Hat Enterprise Linux 10
StatusVersions
Unaffected0:1.5.1-1.el10_2

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
StatusVersions
Unaffected0:1.5.0-6.el10_0

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 8
StatusVersions
Unaffected0:1.4.0-3.el8_10

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 9
StatusVersions
Unaffected0:1.4.0-3.el9_8

Versions not listed are: affected.

Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
StatusVersions
Unaffected0:1.4.0-2.el9_6.1

Versions not listed are: affected.

Red Hat Red Hat Hardened Images
StatusVersions
Unaffected1.5.1-0.1.hum1

Versions not listed are: affected.

Red Hat Red Hat OpenShift Container Platform 4
StatusVersions

Versions not listed are: affected.

Red Hat Red Hat OpenShift Container Platform 4
StatusVersions

Versions not listed are: affected.

Versions the record lists as unaffected: 0:1.5.1-1.el10_2, 0:1.5.0-6.el10_0, 0:1.4.0-3.el8_10, 0:1.4.0-3.el9_8, 0:1.4.0-2.el9_6.1, 1.5.1-0.1.hum1.

Source: CVE List, as of . About the data.

About this vulnerability

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.

Summary: CVE record, as of .

  • CISA has not added CVE-2026-71227 to its Known Exploited Vulnerabilities (KEV) catalog, as of 29 Oct 2026.
  • The CVE record was published on 5 Aug 2026.
  • The CVE record carries a CVSS v3.1 base score of 5.1 (Medium), given by its CNA.
  • FIRST's EPSS model puts the probability of exploitation in the next 30 days at 0.2% (percentile 9.4), as of 29 Oct 2026. EPSS is a statistical estimate, not a report of exploitation.
  • CISA's SSVC assessment in the CVE record: exploitation none, automatable no, technical impact partial.
  • The credits in the CVE record name AISLE as finder.

Source: CISA KEV 2026.10.29, as of ; CVE List, as of ; FIRST EPSS, as of . About the data.

Description

Libkcapi: infinite loop denial of service in libkcapi _kcapi_aio_read_all() due to unhandled io_getevents() timeout return

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 List, as of . About the data.

Weakness

CWE-835

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

DateEvent
CVE record published
CVE record last updated

References

2

Known exploited Red Hat vulnerabilities

  • CVE-2015-3246: Red Hat Libuser Race Condition Vulnerability (added )
  • CVE-2015-5287: Red Hat Automatic Bug Reporting Tool Privilege Escalation Vulnerability (added )
  • CVE-2018-14667: Red Hat JBoss RichFaces Framework Expression Language Injection Vulnerability (added )
  • CVE-2021-3560: Red Hat Polkit Incorrect Authorization Vulnerability (added )
  • CVE-2021-4034: Red Hat Polkit Out-of-Bounds Read and Write Vulnerability (added )