CVE-2025-66003Public exploit

Local root access via unrestricted Samba mounts

Published Jan 8, 2026 · Updated Jan 8, 2026

Privilege escalation in KDE Smb4K before 4.0.5 allows local users to gain root access through the privileged mount helper. Smb4KMountHelper::mount accepts unrestricted target directories and forwards attacker-controlled options to mount.cifs, allowing crafted share content to replace system paths or appear as setuid-root files. An active local session can invoke the D-Bus KAuth action without authentication, but root compromise requires control of the mounted Samba share.

CVSS severity7.3
High
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

Privilege escalation in KDE Smb4K before 4.0.5 allows local users to gain root access through the privileged mount helper. Smb4KMountHelper::mount accepts unrestricted target directories and forwards attacker-controlled options to mount.cifs, allowing crafted share content to replace system paths or appear as setuid-root files. An active local session can invoke the D-Bus KAuth action without authentication, but root compromise requires control of the mounted Samba share.

The record

CVE
CVE-2025-66003
Published
Jan 8, 2026
Updated
Jan 8, 2026
Vendor
KDE
Product
Smb4K
Classifications
CWE-73, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 8, 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=? <4.0.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

KDE · Smb4Kversion=? <4.0.5

Published CVSS scores

7.3SUSECVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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 exploitPublished

Weakness, pattern, technique

CWE-73External Control of File Name or Path
T1068Exploitation for Privilege Escalation

Public exploit references

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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