USN-8193-1

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Source
https://ubuntu.com/security/notices/USN-8193-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8193-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8193-1
Upstream
Related
Published
2026-04-21T15:45:29Z
Modified
2026-04-29T09:53:20.641115Z
Summary
libcap2 vulnerability
Details

Ali Raza discovered that libcap incorrectly handled file capability updates. A local attacker could possibly use this issue to inject or strip capabilities into arbitrary executables and escalate privileges.

References

Affected packages

Ubuntu:22.04:LTS / libcap2

Package

Name
libcap2
Purl
pkg:deb/ubuntu/libcap2@1:2.44-1ubuntu0.22.04.3?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:2.44-1ubuntu0.22.04.3

Affected versions

1:2.*
1:2.44-1build1
1:2.44-1build2
1:2.44-1build3
1:2.44-1ubuntu0.22.04.1
1:2.44-1ubuntu0.22.04.2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libcap2",
            "binary_version": "1:2.44-1ubuntu0.22.04.3"
        },
        {
            "binary_name": "libcap2-bin",
            "binary_version": "1:2.44-1ubuntu0.22.04.3"
        },
        {
            "binary_name": "libpam-cap",
            "binary_version": "1:2.44-1ubuntu0.22.04.3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8193-1.json"
cves_map 
{
    "cves": [
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2026-4878"
        }
    ],
    "ecosystem": "Ubuntu:22.04:LTS"
}

Ubuntu:24.04:LTS / libcap2

Package

Name
libcap2
Purl
pkg:deb/ubuntu/libcap2@1:2.66-5ubuntu2.4?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:2.66-5ubuntu2.4

Affected versions

1:2.*
1:2.66-4ubuntu1
1:2.66-5ubuntu1
1:2.66-5ubuntu2
1:2.66-5ubuntu2.1
1:2.66-5ubuntu2.2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libcap2",
            "binary_version": "1:2.66-5ubuntu2.4"
        },
        {
            "binary_name": "libcap2-bin",
            "binary_version": "1:2.66-5ubuntu2.4"
        },
        {
            "binary_name": "libpam-cap",
            "binary_version": "1:2.66-5ubuntu2.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8193-1.json"
cves_map 
{
    "cves": [
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2026-4878"
        }
    ],
    "ecosystem": "Ubuntu:24.04:LTS"
}

Ubuntu:25.10 / libcap2

Package

Name
libcap2
Purl
pkg:deb/ubuntu/libcap2@1:2.75-7ubuntu2.2?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:2.75-7ubuntu2.2

Affected versions

1:2.*
1:2.73-4ubuntu1
1:2.75-7ubuntu1
1:2.75-7ubuntu2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "golang-kernel-pub-linux-libs-security-libcap-dev",
            "binary_version": "1:2.75-7ubuntu2.2"
        },
        {
            "binary_name": "libcap2",
            "binary_version": "1:2.75-7ubuntu2.2"
        },
        {
            "binary_name": "libcap2-bin",
            "binary_version": "1:2.75-7ubuntu2.2"
        },
        {
            "binary_name": "libpam-cap",
            "binary_version": "1:2.75-7ubuntu2.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8193-1.json"
cves_map 
{
    "cves": [
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2026-4878"
        }
    ],
    "ecosystem": "Ubuntu:25.10"
}