UBUNTU-CVE-2026-18938

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Source
https://ubuntu.com/security/CVE-2026-18938
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18938.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-18938
Upstream
  • CVE-2026-18938
Downstream
Related
Published
2026-08-07T09:16:00Z
Modified
2026-08-31T17:15:59Z
Severity
  • 6.2 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A flaw was found in p11-kit. A local attacker, or one with equivalent access to a reachable RPC channel, could exploit an integer overflow vulnerability. By sending specially crafted messages, the attacker can cause the system to miscalculate memory allocation for nested attributes. This leads to a memory corruption issue, specifically a heap out-of-bounds write, which can crash the p11-kit RPC parsing process, resulting in a Denial of Service (DoS). This vulnerability is only exploitable on 32 bit systems.

References

Affected packages

Ubuntu:Pro:18.04:LTS / p11-kit

Package

Name
p11-kit
Purl
pkg:deb/ubuntu/p11-kit?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.23.9-2ubuntu0.1+esm1

Affected versions

0.*
0.23.7-3
0.23.9-2
0.23.9-2ubuntu0.1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libp11-kit0",
            "binary_version": "0.23.9-2ubuntu0.1+esm1"
        },
        {
            "binary_name": "p11-kit",
            "binary_version": "0.23.9-2ubuntu0.1+esm1"
        },
        {
            "binary_name": "p11-kit-modules",
            "binary_version": "0.23.9-2ubuntu0.1+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18938.json"

Ubuntu:Pro:20.04:LTS / p11-kit

Package

Name
p11-kit
Purl
pkg:deb/ubuntu/p11-kit?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.23.20-1ubuntu0.1+esm1

Affected versions

0.*
0.23.17-2
0.23.18.1-2
0.23.19-2
0.23.20-1
0.23.20-1build1
0.23.20-1ubuntu0.1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libp11-kit0",
            "binary_version": "0.23.20-1ubuntu0.1+esm1"
        },
        {
            "binary_name": "p11-kit",
            "binary_version": "0.23.20-1ubuntu0.1+esm1"
        },
        {
            "binary_name": "p11-kit-modules",
            "binary_version": "0.23.20-1ubuntu0.1+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18938.json"

Ubuntu:22.04:LTS / p11-kit

Package

Name
p11-kit
Purl
pkg:deb/ubuntu/p11-kit?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.24.0-6ubuntu0.1

Affected versions

0.*
0.23.22-1build1
0.24.0-5
0.24.0-6
0.24.0-6build1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libp11-kit0",
            "binary_version": "0.24.0-6ubuntu0.1"
        },
        {
            "binary_name": "p11-kit",
            "binary_version": "0.24.0-6ubuntu0.1"
        },
        {
            "binary_name": "p11-kit-modules",
            "binary_version": "0.24.0-6ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18938.json"

Ubuntu:24.04:LTS / p11-kit

Package

Name
p11-kit
Purl
pkg:deb/ubuntu/p11-kit?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.25.3-4ubuntu2.2

Affected versions

0.*
0.25.0-4ubuntu1
0.25.3-2ubuntu2
0.25.3-4ubuntu1
0.25.3-4ubuntu2
0.25.3-4ubuntu2.1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libp11-kit0",
            "binary_version": "0.25.3-4ubuntu2.2"
        },
        {
            "binary_name": "p11-kit",
            "binary_version": "0.25.3-4ubuntu2.2"
        },
        {
            "binary_name": "p11-kit-modules",
            "binary_version": "0.25.3-4ubuntu2.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18938.json"

Ubuntu:26.04:LTS / p11-kit

Package

Name
p11-kit
Purl
pkg:deb/ubuntu/p11-kit?arch=source&distro=resolute

Affected ranges

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

Affected versions

0.*
0.25.5-3ubuntu1
0.25.9-2
0.25.10-1
0.25.10-1ubuntu1
0.26.2-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libp11-kit0",
            "binary_version": "0.26.2-2"
        },
        {
            "binary_name": "p11-kit",
            "binary_version": "0.26.2-2"
        },
        {
            "binary_name": "p11-kit-modules",
            "binary_version": "0.26.2-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18938.json"