Secuno
ENNL
Book demo

CVE-2026-16903

IBM Aix buffer overflow

9.6 CRITICALEPSS 0.42%
  1. Published19 Aug 2026

Description

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to execute arbitrary code or cause a denial of service due to an out-of-bounds write.

CVSS 3.1 breakdown

Attack vectorAdjacent
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

IBM Vios≥ 4.1.0 < 4.1.0.50 · ≥ 4.1.1.0 < 4.1.1.30 · ≥ 4.1.2.0 < 4.1.2.20
IBM Aix≥ 7.2.5 ≤ 7.2.5.212 · ≥ 7.3.2 ≤ 7.3.2.5 · ≥ 7.3.3 ≤ 7.3.3.2 · ≥ 7.3.4 ≤ 7.3.4.1

Remediation

Fixed in
IBM Vios≥ 4.1.0.50

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-1078158.5
MariaDB server is a community developed fork of MySQL server. From 10.6.1 until…
CVE-2026-195708.8
The LE Audio Broadcast Sink in subsys/bluetooth/audio/bap_broadcast_sink.c copies…
CVE-2026-1079099.1
A heap-based out-of-bounds write in the ws_read_frame function (src/bolt/ws.c) and the…
CVE-2026-1079089.8
A heap-based out-of-bounds write in the BoltReadHandler function (src/bolt/bolt_api.c)…
CVE-2026-823448.1
IBM Guardium Data Protection 12.0, 12.1 is vulnerable to a heap-based buffer overflow…
CVE-2026-823358.1
IBM Guardium Data Protection 12.0, 12.1, 12.2 is vulnerable to a heap-based buffer…

Frequently asked

Is CVE-2026-16903 being actively exploited?

CVE-2026-16903 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.42%.

How severe is CVE-2026-16903?

CVE-2026-16903 has a CVSS 3.1 base score of 9.6, rated critical. EPSS estimates a 0.42% probability of exploitation.

Which products are affected by CVE-2026-16903?

Affected products include IBM Vios, IBM Aix.

How do I fix CVE-2026-16903?

Upgrade affected software to a fixed version, for example IBM Vios 4.1.0.50 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-16903 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.