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CVE-2026-15061: IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 's nimesis registration service could allow a remote attacker to

46
This month
HIGH 8.2REMOTEUPGRADEUPGRADE

CVE-2026-15061 is a high-severity flaw (CVSS 8.2) affecting vios, aix. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 's nimesis registration service could allow a remote attacker to overwrite files due to path traversal.

Why this priority

  • High severity
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score8.2 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.6% (top 52%)
CISA exploited listNo
WeaknessCWE-22
Published2026-08-19
Last modified2026-08-20
Publisher (CNA): IBM Corporation · Vendor: ibm

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Last updated 2026-08-20 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

ibm vios UPGRADE
Affected: >= 4.1.0 and < 4.1.0.50 · >= 4.1.1.0 and < 4.1.1.30 · >= 4.1.2.0 and < 4.1.2.20
Fixed in: 4.1.0.50, 4.1.1.30, 4.1.2.20
Safe to downgrade to: a release before 4.1.0
1. Check installed version
apt-cache policy vios || rpm -q vios || vios --version
2. UPGRADE to 4.1.0.50 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade vios
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade vios
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 4.1.0 (Debian / Ubuntu)
apt-cache madison vios sudo apt install vios=<VERSION_BEFORE_4.1.0> sudo apt-mark hold vios
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list vios sudo dnf downgrade vios-<VERSION_BEFORE_4.1.0> sudo dnf versionlock add vios
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.
ibm aix UPGRADE
Affected: >= 7.2.5 and <= 7.2.5.212 · >= 7.3.2 and <= 7.3.2.5 · >= 7.3.3 and <= 7.3.3.2 · >= 7.3.4 and <= 7.3.4.1
Fixed in: newer than 7.3.4.1
Safe to downgrade to: a release before 7.2.5
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.
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-2026-15061?

vios: upgrade to 4.1.0.50, 4.1.1.30, 4.1.2.20; aix: upgrade to newer than 7.3.4.1. Exact commands for each OS are on this page.

Is CVE-2026-15061 being exploited?

CVE-2026-15061 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-2026-15061 affect?

CVE-2026-15061 affects vios, aix. Severity is high (CVSS 8.2). IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 's nimesis registration service could allow a remote attacker to overwrite files due to path traversal.

How urgent is CVE-2026-15061?

Priority 46/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

References

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