UBUNTU-CVE-2026-4878

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Source
https://ubuntu.com/security/CVE-2026-4878
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4878.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-4878
Upstream
  • CVE-2026-4878
Downstream
Related
Published
2026-04-09T16:16:00Z
Modified
2026-04-29T11:29:22.138592Z
Severity
  • 6.7 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
  • 7.0 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A flaw was found in libcap. A local unprivileged user can exploit a Time-of-check-to-time-of-use (TOCTOU) race condition in the cap_set_file() function. This allows an attacker with write access to a parent directory to redirect file capability updates to an attacker-controlled file. By doing so, capabilities can be injected into or stripped from unintended executables, leading to privilege escalation.

References

Affected packages

Ubuntu:20.04:LTS
libcap2

Package

Name
libcap2
Purl
pkg:deb/ubuntu/libcap2@1:2.32-1ubuntu0.2?arch=source&distro=focal

Affected ranges

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

Affected versions

1:2.*
1:2.25-2
1:2.27-1
1:2.32-1
1:2.32-1ubuntu0.1
1:2.32-1ubuntu0.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libcap2",
            "binary_version": "1:2.32-1ubuntu0.2"
        },
        {
            "binary_name": "libcap2-bin",
            "binary_version": "1:2.32-1ubuntu0.2"
        },
        {
            "binary_name": "libpam-cap",
            "binary_version": "1:2.32-1ubuntu0.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4878.json"
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/cve/2026/UBUNTU-CVE-2026-4878.json"
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/cve/2026/UBUNTU-CVE-2026-4878.json"
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/cve/2026/UBUNTU-CVE-2026-4878.json"
Ubuntu:Pro:14.04:LTS
libcap2

Package

Name
libcap2
Purl
pkg:deb/ubuntu/libcap2@1:2.24-0ubuntu2+esm1?arch=source&distro=esm-infra-legacy/trusty

Affected ranges

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

Affected versions

1:2.*
1:2.22-1.2ubuntu2
1:2.24-0ubuntu1
1:2.24-0ubuntu2
1:2.24-0ubuntu2+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libcap2",
            "binary_version": "1:2.24-0ubuntu2+esm1"
        },
        {
            "binary_name": "libcap2-bin",
            "binary_version": "1:2.24-0ubuntu2+esm1"
        },
        {
            "binary_name": "libpam-cap",
            "binary_version": "1:2.24-0ubuntu2+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4878.json"
Ubuntu:Pro:16.04:LTS
libcap2

Package

Name
libcap2
Purl
pkg:deb/ubuntu/libcap2@1:2.24-12ubuntu0.1~esm1?arch=source&distro=esm-infra/xenial

Affected ranges

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

Affected versions

1:2.*
1:2.24-9
1:2.24-12
1:2.24-12ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libcap2",
            "binary_version": "1:2.24-12ubuntu0.1~esm1"
        },
        {
            "binary_name": "libcap2-bin",
            "binary_version": "1:2.24-12ubuntu0.1~esm1"
        },
        {
            "binary_name": "libpam-cap",
            "binary_version": "1:2.24-12ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4878.json"
Ubuntu:Pro:18.04:LTS
libcap2

Package

Name
libcap2
Purl
pkg:deb/ubuntu/libcap2@1:2.25-1.2ubuntu0.1~esm1?arch=source&distro=esm-infra/bionic

Affected ranges

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

Affected versions

1:2.*
1:2.25-1.1
1:2.25-1.2
1:2.25-1.2ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libcap2",
            "binary_version": "1:2.25-1.2ubuntu0.1~esm1"
        },
        {
            "binary_name": "libcap2-bin",
            "binary_version": "1:2.25-1.2ubuntu0.1~esm1"
        },
        {
            "binary_name": "libpam-cap",
            "binary_version": "1:2.25-1.2ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-4878.json"