UBUNTU-CVE-2026-12505

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Source
https://ubuntu.com/security/CVE-2026-12505
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12505.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-12505
Upstream
  • CVE-2026-12505
Downstream
Related
Published
2026-06-18T04:16:00Z
Modified
2026-07-13T20:44:41Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A flaw was found in the cifs-utils package where the cifs.upcall helper fails to securely drop its root privileges before looking up user information inside a user-controlled environment. A local, low privileged attacker can exploit this by using a crafted request_key payload to trick the root-owned helper into entering a custom environment (namespace) containing a malicious NSS module. This forces the system to load the attacker's controlled NSS Module and configuration, allowing them to execute arbitrary commands as the root user, elevating their privileges and fully compromising the system.

References

Affected packages

Ubuntu:18.04:LTS
cifs-utils

Package

Name
cifs-utils
Purl
pkg:deb/ubuntu/cifs-utils?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2:6.*
2:6.7-1
2:6.8-1
2:6.8-1ubuntu1
2:6.8-1ubuntu1.1
2:6.8-1ubuntu1.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "cifs-utils",
            "binary_version": "2:6.8-1ubuntu1.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12505.json"
Ubuntu:20.04:LTS
cifs-utils

Package

Name
cifs-utils
Purl
pkg:deb/ubuntu/cifs-utils?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2:6.*
2:6.9-0ubuntu1
2:6.9-1
2:6.9-1ubuntu0.1
2:6.9-1ubuntu0.2
2:6.9-1ubuntu0.3
2:6.9-1ubuntu0.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "cifs-utils",
            "binary_version": "2:6.9-1ubuntu0.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12505.json"
Ubuntu:22.04:LTS
cifs-utils

Package

Name
cifs-utils
Purl
pkg:deb/ubuntu/cifs-utils?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:6.14-1ubuntu0.6

Affected versions

2:6.*
2:6.11-3.1
2:6.14-1
2:6.14-1build1
2:6.14-1ubuntu0.1
2:6.14-1ubuntu0.2
2:6.14-1ubuntu0.3
2:6.14-1ubuntu0.4
2:6.14-1ubuntu0.5

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "cifs-utils",
            "binary_version": "2:6.14-1ubuntu0.6"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12505.json"
Ubuntu:24.04:LTS
cifs-utils

Package

Name
cifs-utils
Purl
pkg:deb/ubuntu/cifs-utils?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:7.0-2ubuntu0.5

Affected versions

2:7.*
2:7.0-2
2:7.0-2build1
2:7.0-2ubuntu0.1
2:7.0-2ubuntu0.2
2:7.0-2ubuntu0.3
2:7.0-2ubuntu0.4

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "cifs-utils",
            "binary_version": "2:7.0-2ubuntu0.5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12505.json"
Ubuntu:25.10
cifs-utils

Package

Name
cifs-utils
Purl
pkg:deb/ubuntu/cifs-utils?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2:7.*
2:7.2-2
2:7.3-1
2:7.4-1
2:7.4-1ubuntu0.25.10.1
2:7.4-1ubuntu0.25.10.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "cifs-utils",
            "binary_version": "2:7.4-1ubuntu0.25.10.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12505.json"
Ubuntu:26.04:LTS
cifs-utils

Package

Name
cifs-utils
Purl
pkg:deb/ubuntu/cifs-utils?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:7.4-1ubuntu0.26.04.3

Affected versions

2:7.*
2:7.4-1
2:7.4-1build1
2:7.4-1ubuntu0.26.04.1
2:7.4-1ubuntu0.26.04.2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "cifs-utils",
            "binary_version": "2:7.4-1ubuntu0.26.04.3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12505.json"
Ubuntu:Pro:14.04:LTS
cifs-utils

Package

Name
cifs-utils
Purl
pkg:deb/ubuntu/cifs-utils?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2:6.*
2:6.0-1ubuntu2
2:6.0-1ubuntu2+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "cifs-utils",
            "binary_version": "2:6.0-1ubuntu2+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12505.json"
Ubuntu:Pro:16.04:LTS
cifs-utils

Package

Name
cifs-utils
Purl
pkg:deb/ubuntu/cifs-utils?arch=source&distro=esm-infra%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2:6.*
2:6.4-1ubuntu1
2:6.4-1ubuntu1.1
2:6.4-1ubuntu1.1+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "cifs-utils",
            "binary_version": "2:6.4-1ubuntu1.1+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-12505.json"