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SolarisOperating system · Oracle

CVE-2026-21927

MEDIUM · 5.8 CVSS v3.1 Published 2026-01-20
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
58/100
Remediation priority · Elevated

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Vulnerability in the Oracle Solaris product of Oracle Systems (component: Driver). The supported version that is affected is 11. Easily exploitable vulnerability allows high privileged attacker with logon to the infrastructure where Oracle Solaris executes to compromise Oracle Solaris. Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Oracle Solaris accessible data as well as unauthorized access to critical data or complete access to all Oracle Solaris accessible data. CVSS 3.1 Base Score 5.8 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N).

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

A vulnerability in the Driver component of Oracle Solaris 11 allows a high-privileged attacker with local system access to compromise the system through human interaction. Successful exploitation grants unauthorized creation, deletion, or modification of critical data, as well as unauthorized access to sensitive or all accessible data. The attack requires both high privileges and user interaction from another person.

MitigationApply Oracle's security patch for CVE-2026-21927 when released. Limit high-privileged access to Solaris systems and enforce strict physical/logical access controls to reduce the attack surface.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
SolarisOperating system
Affected:= 10= 11

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify Oracle Solaris version
    Run 'uname -a' or 'cat /etc/release' to determine the installed Solaris version
    Affected if The version is 10 or 11, as these are the affected versions listed for this CVE
  2. Confirm Driver component is in use
    Check for active driver services by reviewing running processes related to drivers, or check system configuration files in /kernel/drv/ for loaded driver modules
    Affected if Any driver modules are loaded or active on the system, as the vulnerability exists in the Driver component itself
  3. Verify high-privileged access exists
    Review administrative or root-level accounts present on the system using 'getent passwd' or checking /etc/passwd for UID 0 accounts
    Affected if Multiple high-privileged (root or equivalent) accounts exist, as the CVE requires a high-privileged attacker for exploitation
  4. Assess user interaction vectors
    Identify whether the system supports or permits scenarios where one user could trigger actions requiring interaction from another user, such as shared terminal sessions, graphical login managers, or multi-user access configurations
    Affected if The system allows scenarios where user interaction from another person can be induced or is required for certain operations

A user is affected if they are running Oracle Solaris version 10 or 11 with the Driver component active, and an attacker with high privileges can induce user interaction from another person to exploit the driver.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply Oracle's security patch for CVE-2026-21927 when released. Limit high-privileged access to Solaris systems and enforce strict physical/logical access controls to reduce the attack surface.

Fix this in Solaris Scoped from the published advisory
  • Consultation2.0 h
  • Implementation1.0 h
  • Testing2.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,060
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Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-21927 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data