High severity · published Jan 8, 2026
CVE-2025-66003
Local users can perform a local root exploit via smb4k mounthelper
7.3
CVSS
0.1%
EPSS
No
On KEV
Description
An External Control of File Name or Path vulnerability in smb4k allowsl ocal users to perform a local root exploit via smb4k mounthelper if they can access and control the contents of a Samba shareThis issue affects smb4k: from ? before 4.0.5.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 2% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SM
smb4k · https://github.com/KDE/
? before 4.0.5 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-66003
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-66003
bugzilla.suse.com
https://bugzilla.suse.com/show_bug.cgi?id=CVE-2025-66003
security.opensuse.org
https://security.opensuse.org/2025/12/10/smb4k-major-issues-in-kauth-helper.html
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Local users can perform arbitrary unmounts via smb4k mount helper due to lack of input validation