CVE-2026-17270: IBM i 7.6, 7.5, 7.4, and 7.3 could allow a local attacker to cause a denial of service due to a stack-based bu

Routine

MEDIUM 4.3MITIGATE

CVE-2026-17270 is a medium-severity flaw (CVSS 4.3) affecting i. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IBM i 7.6, 7.5, 7.4, and 7.3 could allow a local attacker to cause a denial of service due to a stack-based buffer overflow.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-121
Published	2026-09-04
Last modified	2026-09-10

Publisher (CNA): IBM Corporation · Vendor: ibm

Last updated 2026-09-10 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-04 17:16 UTCPublished CVE record published
2026-09-10 21:17 UTCUpdated Record last modified

ibm i MITIGATE

Affected: 7.3 · 7.4 · 7.5 · 7.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.3

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-2026-17270?

i: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-17270 being exploited?

CVE-2026-17270 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-2026-17270 affect?

CVE-2026-17270 affects i. Severity is medium (CVSS 4.3). IBM i 7.6, 7.5, 7.4, and 7.3 could allow a local attacker to cause a denial of service due to a stack-based buffer overflow.

How urgent is CVE-2026-17270?

Priority 20/100. No elevated risk signals yet.

Related CVEs

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References

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