usn-7959-1
Vulnerability from osv_ubuntu
Published
2026-01-14 05:20
Modified
2026-06-25 10:47
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
| URL | Type | |
|---|---|---|
{
"affected": [
{
"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"
}
},
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "klibc",
"purl": "pkg:deb/ubuntu/klibc@2.0.3-0ubuntu1.14.04.3+esm4?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.0.3-0ubuntu1.14.04.3+esm4"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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"
]
},
{
"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"
}
},
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "klibc",
"purl": "pkg:deb/ubuntu/klibc@2.0.4-8ubuntu1.16.04.4+esm3?arch=source\u0026distro=esm-infra/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.0.4-8ubuntu1.16.04.4+esm3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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"
]
},
{
"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"
}
},
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "klibc",
"purl": "pkg:deb/ubuntu/klibc@2.0.4-9ubuntu2.2+esm2?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.0.4-9ubuntu2.2+esm2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.4-9ubuntu1",
"2.0.4-9ubuntu2",
"2.0.4-9ubuntu2.1",
"2.0.4-9ubuntu2.2",
"2.0.4-9ubuntu2.2+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"
}
},
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "klibc",
"purl": "pkg:deb/ubuntu/klibc@2.0.7-1ubuntu5.2+esm1?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.0.7-1ubuntu5.2+esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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"
]
},
{
"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"
}
},
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "klibc",
"purl": "pkg:deb/ubuntu/klibc@2.0.10-4ubuntu0.2?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.0.10-4ubuntu0.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.8-6.1ubuntu2",
"2.0.10-3",
"2.0.10-4",
"2.0.10-4ubuntu0.1"
]
},
{
"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:24.04:LTS"
}
},
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "klibc",
"purl": "pkg:deb/ubuntu/klibc@2.0.13-4ubuntu0.2?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.0.13-4ubuntu0.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.13-1",
"2.0.13-2",
"2.0.13-2ubuntu1",
"2.0.13-4",
"2.0.13-4ubuntu0.1"
]
},
{
"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"
}
},
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "klibc",
"purl": "pkg:deb/ubuntu/klibc@2.0.14-1ubuntu1.1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.0.14-1ubuntu1.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.13-4ubuntu1",
"2.0.14-1ubuntu1"
]
}
],
"aliases": [],
"details": "It was discovered that zlib, vendored in klibc, did not properly handle\ninteger arithmetic. An attacker could possibly use this issue to execute\narbitrary code or cause a denial of service.",
"id": "USN-7959-1",
"modified": "2026-06-25T10:47:03Z",
"published": "2026-01-14T05:20:01Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-7959-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2016-9843"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "klibc vulnerabilities",
"upstream": [
"UBUNTU-CVE-2016-9843"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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