CVE Intelligence
High Memory corruption

CVE-2026-17422 — Out-of-bounds Write in Ibm Aix

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to execute arbitrary code due to a buffer overflow.

Published Aug 20, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database · CNA: psirt@us.ibm.com

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.
How the score was calculated
  • Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
—
No EPSS score.
Affects
Ibm
Aix and 1 more
CVSS base
8.8
High · 2 source(s)
Prioritization reference: 9.3 provisional

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

  • Documented patch — www.ibm.com (NIST National Vulnerability Database)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Ibm Aix, Ibm Vios).
  2. Apply the fixed version or the patch documented under Remediation.
  3. Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Ibm Aix ≥ 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 Vulnerable NIST National Vulnerability Database
Ibm Vios ≥ 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 Vulnerable NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
9.3 CVSS 3.1 Critical 2.5 6.0 psirt@us.ibm.com via NIST National Vulnerability Database
8.8 CVSS 3.1 High 2.0 6.0 nvd@nist.gov via NIST National Vulnerability Database
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H (score shown at the top: nvd@nist.gov)
Scoring entities (NIST, CNA, ADP) score independently; each score is shown with its origin. For prioritization we use 9.3 (psirt@us.ibm.com via NIST National Vulnerability Database) as a conservative provisional reference — not a definitive official score.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-787 · Out-of-bounds Write

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
  • Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.
endpoint telemetry (EDR)crash dumps

Timeline

What happened to this CVE, newest first.

  • 2026
  • Record published
    Oct 15, 2026
  • Fix documented
    Oct 15, 2026 · NIST National Vulnerability Database
  • CVSS changed · 8.8
    Oct 15, 2026 · NIST National Vulnerability Database
  • Source status changed · → Analyzed
    Oct 15, 2026 · NIST National Vulnerability Database
  • Record created in this database
    Oct 15, 2026 · NIST National Vulnerability Database
  • CVE published
    Aug 20, 2026 · psirt@us.ibm.com

Source activity

Repeated readings are counted rather than listed.

  • 1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

1 on the record

Elsewhere on this site

Ibm
every CVE for this vendor
Memory corruption
same class
CWE-787
other pages naming this weakness

Related CVEs (same products)

  • CVE-2026-16821 Use of Externally-Controlled Format String in Ibm Aix Aug 28, 2026
  • CVE-2026-19448 Use of Uninitialized Resource in Ibm Vios Aug 20, 2026
  • CVE-2026-19442 Untrusted Pointer Dereference in Ibm Vios Aug 20, 2026
  • CVE-2026-19446 Uncontrolled Resource Consumption in Ibm Vios Aug 20, 2026
  • CVE-2026-19449 Improper Privilege Management in Ibm Vios Aug 20, 2026
  • CVE-2026-19783 Out-of-bounds Write in Ibm Vios Aug 20, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No FIRST EPSS score.
  • No CISA SSVC assessment.
  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-17422 is "Out-of-bounds Write in Ibm Aix", rated High. It affects Aix (Ibm); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 8.8 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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