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CVE-2026-71226: Memory Corruption via Uncanceled AIO Requests on Error: libkcapi's one-shot AIO path can return an error befor

31
Routine
HIGH 7.3WATCHLISTMITIGATEDOWNGRADEUPGRADE

CVE-2026-71226 is a high-severity flaw (CVSS 7.3) 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.

Memory Corruption via Uncanceled AIO Requests on Error: libkcapi's one-shot AIO path can return an error before all submitted IOCBs are drained, allowing later kernel writes into caller-owned output buffers.

Why this priority

  • High severity
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score7.3 (High)
Attack vectorLocal
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.1% (top 97%)
CISA exploited listNo
WeaknessCWE-416
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 · gum · FIXED · 2.0.2-1.fc46 · FEDORA-2026-da0d6dd894 · source
sudo dnf upgrade --advisory=FEDORA-2026-da0d6dd894
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.

Quick answers

How do I fix CVE-2026-71226?

hardened images: mitigate or apply the listed mitigation; openshift container platform: downgrade or apply the listed mitigation; libkcapi: upgrade to 1.5.1. Exact commands for each OS are on this page.

Is CVE-2026-71226 being exploited?

CVE-2026-71226 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-71226 affect?

CVE-2026-71226 affects hardened images, openshift container platform, libkcapi. Severity is high (CVSS 7.3). Memory Corruption via Uncanceled AIO Requests on Error: libkcapi's one-shot AIO path can return an error before all submitted IOCBs are drained, allowing later kernel writes into caller-owned output buffers.

How urgent is CVE-2026-71226?

Priority 31/100. High severity; On your watchlist

Related CVEs

References

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