CVE-2026-21942

Local system hang or repeatable crash

Published Jan 20, 2026 · Updated Jan 20, 2026

Denial of service in Filesystems in Oracle Solaris 10 and 11 allows local users to cause a system hang or repeatable crash. Oracle has not disclosed the affected filesystem, code locus, crafted input, or incorrect operation that triggers the failure. Exploitation requires a low-privileged logged-on user and interaction by another person; the reported consequence is limited to loss of availability.

CVSS severity5.0
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Filesystems in Oracle Solaris 10 and 11 allows local users to cause a system hang or repeatable crash. Oracle has not disclosed the affected filesystem, code locus, crafted input, or incorrect operation that triggers the failure. Exploitation requires a low-privileged logged-on user and interaction by another person; the reported consequence is limited to loss of availability.

The record

CVE
CVE-2026-21942
Published
Jan 20, 2026
Updated
Jan 20, 2026
Vendor
Oracle
Product
Oracle Solaris
Classifications
CWE-400, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10
  2. Affected versionversion=11

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Oracle · Oracle Solarisversion=10; version=11

Published CVSS scores

5.0OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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