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CVE-2026-71227: A flaw was found in libkcapi

30
Routine
MEDIUM 5.1WATCHLISTMITIGATEDOWNGRADEUPGRADE

CVE-2026-71227 is a medium-severity flaw (CVSS 5.1) affecting hardened images, openshift container platform, libkcapi. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

  • Public exploit reference
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score5.1 (Medium)
Attack vectorLocal
Attack complexityHigh
Privileges neededNone
User interactionNone
EPSS exploit chance0.2% (top 91%)
CISA exploited listNo
WeaknessCWE-835
Published2026-08-05
Last modified2026-10-22
Publisher (CNA): Red Hat, Inc. · Vendor: redhat · smuellerdd

Am I affected?

Timeline

redhat hardened images MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy hardened-images || rpm -q hardened-images || hardened-images --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.
redhat openshift container platform DOWNGRADE
Affected: 4.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 4.0
1. Check installed version
apt-cache policy openshift-container-platform || rpm -q openshift-container-platform || openshift-container-platform --version
2. No fixed release: DOWNGRADE to a release before 4.0 (Debian / Ubuntu)
apt-cache madison openshift-container-platform sudo apt install openshift-container-platform=<VERSION_BEFORE_4.0> sudo apt-mark hold openshift-container-platform
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list openshift-container-platform sudo dnf downgrade openshift-container-platform-<VERSION_BEFORE_4.0> sudo dnf versionlock add openshift-container-platform
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
smuellerdd libkcapi UPGRADE
Affected: >= 0.12.0 and < 1.5.1
Fixed in: 1.5.1
Safe to downgrade to: a release before 0.12.0
1. Check installed version
apt-cache policy libkcapi || rpm -q libkcapi || libkcapi --version
2. UPGRADE to 1.5.1 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade libkcapi
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade libkcapi
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 0.12.0 (Debian / Ubuntu)
apt-cache madison libkcapi sudo apt install libkcapi=<VERSION_BEFORE_0.12.0> sudo apt-mark hold libkcapi
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list libkcapi sudo dnf downgrade libkcapi-<VERSION_BEFORE_0.12.0> sudo dnf versionlock add libkcapi
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
redhat enterprise linux MITIGATE
Affected: 8.0 · 9.0 · 10.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 8.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.
Fedora 46 · diffoscope · FIXED · 335-1.fc46 · FEDORA-2026-e4c4cc0856 · source
sudo dnf upgrade --advisory=FEDORA-2026-e4c4cc0856
Debian 12 · libkcapi · NO FIX YET
Debian 13 · libkcapi · NO FIX YET
RHEL 10 · libkcapi · FIXED · libkcapi-1.5.1-1.el10_2
sudo dnf upgrade --advisory=RHSA-2026:67267 rpm -q libkcapi
RHEL 10.0 Extended Update Support · libkcapi · FIXED · libkcapi-1.5.0-6.el10_0
sudo dnf upgrade --advisory=RHSA-2026:69285 rpm -q libkcapi
RHEL 8 · libkcapi · FIXED · libkcapi-1.4.0-3.el8_10
sudo dnf upgrade --advisory=RHSA-2026:67266 rpm -q libkcapi
RHEL 9 · libkcapi · FIXED · libkcapi-1.4.0-3.el9_8
sudo dnf upgrade --advisory=RHSA-2026:67265 rpm -q libkcapi
RHEL 9.6 Extended Update Support · libkcapi · FIXED · libkcapi-1.4.0-2.el9_6.1
sudo dnf upgrade --advisory=RHSA-2026:87712 rpm -q libkcapi
Alpine 3.21 · libkcapi · FIXED · libkcapi-1.5.1-r0
apk add --upgrade libkcapi apk info -v libkcapi
Alpine 3.22 · libkcapi · FIXED · libkcapi-1.5.1-r0
apk add --upgrade libkcapi apk info -v libkcapi
Alpine 3.23 · libkcapi · FIXED · libkcapi-1.5.1-r0
apk add --upgrade libkcapi apk info -v libkcapi
Alpine 3.24 · libkcapi · FIXED · libkcapi-1.5.1-r0
apk add --upgrade libkcapi apk info -v libkcapi
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

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References

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