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Vulnerabilities

Vulnerability · CVE-2026-16838

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to overwrite critical files and obtain sensitive information due to a time-of-check to time-…

Published Aug 19, 2026 · catalog updated Oct 26, 2026 · the affected product

Last checked Oct 26, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-16838. EPSS is 0.10%. Act only if a listed version of the affected product is installed.

Gaps on this record

  • No plain product name is stored. The page cannot tell you which product to check.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.10%
Remediation
Version ranges on file
Affected products
cpe ibm/aix · cpe ibm/vios

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to overwrite critical files and obtain sensitive information due to a time-of-check to time-of-use (TOCTOU) race condition.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe ibm/aix>= 7.2.5, <= 7.2.5.212
  • cpe ibm/aix>= 7.3.2, <= 7.3.2.5
  • cpe ibm/aix>= 7.3.3, <= 7.3.3.2
  • cpe ibm/aix>= 7.3.4, <= 7.3.4.1
  • cpe ibm/vios< 4.1.0.50
  • cpe ibm/vios< 4.1.1.30
  • cpe ibm/vios< 4.1.2.20

How to fix CVE-2026-16838

  • Upgrade

    CVE-2026-16838 lists a fix boundary at 7.2.5.212. Compare the installed build with that boundary before you change production.

  • Version check

    Affected <= 7.2.5.212

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-16838. EPSS is 0.10%. Act only if a listed version of the affected product is installed.

Which versions are affected?

Compare what you have installed with >= 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, < 4.1.0.50, < 4.1.1.30. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition. EPSS 0.10%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 19, 2026 · NIST NVD

    Detected

    IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to overwrite critical files and obtain sensitive information due to a time-of-check to time-of-use (TOCTOU) race condition.

  2. Oct 26, 2026 · NIST NVD

    Updated

    IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to overwrite critical files and obtain sensitive information due to a time-of-check to time-of-use (TOCTOU) race condition.

Sources

  • CVE.orgVulnerability recordCVE-2026-16838

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-2026-16838

    IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a local attacker to overwrite critical files and obtain sensitive information due to a time-of-check to time-of-use (TOCTOU) race condition.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 26, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgOct 26, 2026
  • NIST NVDOct 26, 2026