USN-7959-1

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Source
https://ubuntu.com/security/notices/USN-7959-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7959-1.json
JSON Data
https://api.test.osv.dev/v1/vulns/USN-7959-1
Upstream
Related
Published
2026-01-14T05:20:01Z
Modified
2026-06-25T13:33:31Z
Summary
klibc vulnerabilities
Details

It was discovered that zlib, vendored in klibc, did not properly handle integer arithmetic. An attacker could possibly use this issue to execute arbitrary code or cause a denial of service.

References

Affected packages

Ubuntu:22.04:LTS
klibc

Package

Name
klibc
Purl
pkg:deb/ubuntu/klibc?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.0.10-4ubuntu0.2

Affected versions

2.*
2.0.8-6.1ubuntu2
2.0.10-3
2.0.10-4
2.0.10-4ubuntu0.1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "klibc-utils",
            "binary_version": "2.0.10-4ubuntu0.2"
        },
        {
            "binary_name": "libklibc",
            "binary_version": "2.0.10-4ubuntu0.2"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2016-9843",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "low",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:22.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7959-1.json"
Ubuntu:24.04:LTS
klibc

Package

Name
klibc
Purl
pkg:deb/ubuntu/klibc?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.0.13-4ubuntu0.2

Affected versions

2.*
2.0.13-1
2.0.13-2
2.0.13-2ubuntu1
2.0.13-4
2.0.13-4ubuntu0.1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "klibc-utils",
            "binary_version": "2.0.13-4ubuntu0.2"
        },
        {
            "binary_name": "libklibc",
            "binary_version": "2.0.13-4ubuntu0.2"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2016-9843",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "low",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:24.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7959-1.json"
Ubuntu:25.10
klibc

Package

Name
klibc
Purl
pkg:deb/ubuntu/klibc?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.0.14-1ubuntu1.1

Affected versions

2.*
2.0.13-4ubuntu1
2.0.14-1ubuntu1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "klibc-utils",
            "binary_version": "2.0.14-1ubuntu1.1"
        },
        {
            "binary_name": "libklibc",
            "binary_version": "2.0.14-1ubuntu1.1"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2016-9843",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "low",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:25.10"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7959-1.json"
Ubuntu:Pro:14.04:LTS
klibc

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.0.3-0ubuntu1.14.04.3+esm4

Affected versions

2.*
2.0.1-3.1ubuntu2
2.0.2-1ubuntu1
2.0.2-1ubuntu2
2.0.3-0ubuntu1
2.0.3-0ubuntu1.14.04.1
2.0.3-0ubuntu1.14.04.2
2.0.3-0ubuntu1.14.04.3
2.0.3-0ubuntu1.14.04.3+esm2
2.0.3-0ubuntu1.14.04.3+esm3

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "klibc-utils",
            "binary_version": "2.0.3-0ubuntu1.14.04.3+esm4"
        },
        {
            "binary_name": "libklibc",
            "binary_version": "2.0.3-0ubuntu1.14.04.3+esm4"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2016-9843",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "low",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:14.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7959-1.json"
Ubuntu:Pro:16.04:LTS
klibc

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.0.4-8ubuntu1.16.04.4+esm3

Affected versions

2.*
2.0.3-0ubuntu1
2.0.4-4
2.0.4-6
2.0.4-7
2.0.4-8
2.0.4-8ubuntu1
2.0.4-8ubuntu1.16.04.1
2.0.4-8ubuntu1.16.04.2
2.0.4-8ubuntu1.16.04.3
2.0.4-8ubuntu1.16.04.4
2.0.4-8ubuntu1.16.04.4+esm1
2.0.4-8ubuntu1.16.04.4+esm2

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "klibc-utils",
            "binary_version": "2.0.4-8ubuntu1.16.04.4+esm3"
        },
        {
            "binary_name": "libklibc",
            "binary_version": "2.0.4-8ubuntu1.16.04.4+esm3"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2016-9843",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "low",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:16.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7959-1.json"
Ubuntu:Pro:18.04:LTS
klibc

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.0.4-9ubuntu2.2+esm2

Affected versions

2.*
2.0.4-9ubuntu1
2.0.4-9ubuntu2
2.0.4-9ubuntu2.1
2.0.4-9ubuntu2.2
2.0.4-9ubuntu2.2+esm1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "klibc-utils",
            "binary_version": "2.0.4-9ubuntu2.2+esm2"
        },
        {
            "binary_name": "libklibc",
            "binary_version": "2.0.4-9ubuntu2.2+esm2"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2016-9843",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "low",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:18.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7959-1.json"
Ubuntu:Pro:20.04:LTS
klibc

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.0.7-1ubuntu5.2+esm1

Affected versions

2.*
2.0.6-1ubuntu1
2.0.6-1ubuntu2
2.0.7-1ubuntu1
2.0.7-1ubuntu3
2.0.7-1ubuntu4
2.0.7-1ubuntu5
2.0.7-1ubuntu5.1
2.0.7-1ubuntu5.2

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "klibc-utils",
            "binary_version": "2.0.7-1ubuntu5.2+esm1"
        },
        {
            "binary_name": "libklibc",
            "binary_version": "2.0.7-1ubuntu5.2+esm1"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2016-9843",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "low",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:20.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7959-1.json"