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
2026-01-14T05:20:01.109396Z
Modified
2026-01-20T16:46:16.221779Z
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@2.0.10-4ubuntu0.2?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown 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"
        },
        {
            "binary_name": "libklibc-dev",
            "binary_version": "2.0.10-4ubuntu0.2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7959-1.json"

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"
}

Ubuntu:24.04:LTS

klibc

Package

Name
klibc
Purl
pkg:deb/ubuntu/klibc@2.0.13-4ubuntu0.2?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown 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"
        },
        {
            "binary_name": "libklibc-dev",
            "binary_version": "2.0.13-4ubuntu0.2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7959-1.json"

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"
}

Ubuntu:25.10

klibc

Package

Name
klibc
Purl
pkg:deb/ubuntu/klibc@2.0.14-1ubuntu1.1?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown 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"
        },
        {
            "binary_name": "libklibc-dev",
            "binary_version": "2.0.14-1ubuntu1.1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7959-1.json"

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"
}

Ubuntu:Pro:14.04:LTS

klibc

Package

Name
klibc
Purl
pkg:deb/ubuntu/klibc@2.0.3-0ubuntu1.14.04.3+esm4?arch=source&distro=esm-infra-legacy/trusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown 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"
        },
        {
            "binary_name": "libklibc-dev",
            "binary_version": "2.0.3-0ubuntu1.14.04.3+esm4"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7959-1.json"

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"
}

Ubuntu:Pro:16.04:LTS

klibc

Package

Name
klibc
Purl
pkg:deb/ubuntu/klibc@2.0.4-8ubuntu1.16.04.4+esm3?arch=source&distro=esm-infra/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown 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"
        },
        {
            "binary_name": "libklibc-dev",
            "binary_version": "2.0.4-8ubuntu1.16.04.4+esm3"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7959-1.json"

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"
}

Ubuntu:Pro:18.04:LTS

klibc

Package

Name
klibc
Purl
pkg:deb/ubuntu/klibc@2.0.4-9ubuntu2.2+esm2?arch=source&distro=esm-infra/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown 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"
        },
        {
            "binary_name": "libklibc-dev",
            "binary_version": "2.0.4-9ubuntu2.2+esm2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7959-1.json"

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"
}

Ubuntu:Pro:20.04:LTS

klibc

Package

Name
klibc
Purl
pkg:deb/ubuntu/klibc@2.0.7-1ubuntu5.2+esm1?arch=source&distro=esm-infra/focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown 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"
        },
        {
            "binary_name": "libklibc-dev",
            "binary_version": "2.0.7-1ubuntu5.2+esm1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7959-1.json"

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"
}