ubuntu-cve-2026-41579
Vulnerability from osv_ubuntu
Published
2026-07-01 02:17
Modified
2026-07-01 21:23
Summary
Details
runc is a CLI tool for spawning and running containers according to the OCI specification. In versions prior to 1.3.6, 1.4.0-rc.1, 1.4.0-rc.12, 1.5.0-rc.1, and 1.5.0-rc.1, when setting up the container rootfs, setupPtmx and setupDevSymlinks call os.Remove and os.Symlink with a filepath.Join string which allow an image with /dev as a symlink to trick runc into deleting files called ptmx on the host or creating a hardcoded set of symlinks with specific names and targets in an arbitrary pre-existing host directory. This issue is not exploitable under Docker, because Docker creates a top-level read-only layer that masks any malicious /dev symlink present in the container image — unlike some other Linux container tooling, whose higher-level runtimes built on runc remain exposed to exploitation via a malicious image. This issue has been fixed in versions 1.3.6, 1.4.3 and 1.5.0.
Severity
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "golang-github-opencontainers-runc-dev",
"binary_version": "1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm4"
},
{
"binary_name": "runc",
"binary_version": "1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm4"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "runc",
"purl": "pkg:deb/ubuntu/runc@1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm4?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.0.8+dfsg-2",
"0.1.1-0ubuntu5~16.04",
"1.0.0~rc1-0ubuntu1~16.04",
"1.0.0~rc1-0ubuntu2~16.04.1",
"1.0.0~rc1-0ubuntu2~16.04.1.1",
"1.0.0~rc2-0ubuntu2~16.04.1",
"1.0.0~rc2+docker1.12.6-0ubuntu1~16.04.1",
"1.0.0~rc2+docker1.13.1-0ubuntu1~16.04.1",
"1.0.0~rc2+docker1.13.1-0ubuntu1~16.04.2",
"1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.3",
"1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4",
"1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm1",
"1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm2",
"1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm4"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "golang-github-opencontainers-runc-dev",
"binary_version": "1.1.4-0ubuntu1~18.04.2+esm1"
},
{
"binary_name": "runc",
"binary_version": "1.1.4-0ubuntu1~18.04.2+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "runc",
"purl": "pkg:deb/ubuntu/runc@1.1.4-0ubuntu1~18.04.2+esm1?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.0~rc2+docker1.13.1-0ubuntu1",
"1.0.0~rc4+dfsg1-2",
"1.0.0~rc4+dfsg1-6",
"1.0.0~rc4+dfsg1-6ubuntu0.18.04.1",
"1.0.0~rc7+git20190403.029124da-0ubuntu1~18.04.1",
"1.0.0~rc7+git20190403.029124da-0ubuntu1~18.04.2",
"1.0.0~rc7+git20190403.029124da-0ubuntu1~18.04.2+esm1",
"1.0.0~rc10-0ubuntu1~18.04.1",
"1.0.0~rc10-0ubuntu1~18.04.2",
"1.0.0~rc93-0ubuntu1~18.04.1",
"1.0.0~rc93-0ubuntu1~18.04.2",
"1.0.0~rc95-0ubuntu1~18.04.1",
"1.0.0~rc95-0ubuntu1~18.04.2",
"1.0.1-0ubuntu2~18.04.1",
"1.1.0-0ubuntu1~18.04.1",
"1.1.4-0ubuntu1~18.04.1",
"1.1.4-0ubuntu1~18.04.2",
"1.1.4-0ubuntu1~18.04.2+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "golang-github-opencontainers-runc-dev",
"binary_version": "1.1.7-0ubuntu1~20.04.5"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "runc",
"purl": "pkg:deb/ubuntu/runc@1.1.7-0ubuntu1~20.04.5?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.0~rc8+git20190923.3e425f80-0ubuntu1",
"1.0.0~rc10-0ubuntu1",
"1.0.0~rc93-0ubuntu1~20.04.1",
"1.0.0~rc93-0ubuntu1~20.04.2",
"1.0.0~rc95-0ubuntu1~20.04.1",
"1.0.0~rc95-0ubuntu1~20.04.2",
"1.0.1-0ubuntu2~20.04.1",
"1.1.0-0ubuntu1~20.04.1",
"1.1.0-0ubuntu1~20.04.2",
"1.1.4-0ubuntu1~20.04.1",
"1.1.4-0ubuntu1~20.04.2",
"1.1.4-0ubuntu1~20.04.3",
"1.1.7-0ubuntu1~20.04.1",
"1.1.7-0ubuntu1~20.04.2",
"1.1.7-0ubuntu1~20.04.4",
"1.1.7-0ubuntu1~20.04.5"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "runc",
"binary_version": "1.1.12-0ubuntu2~20.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "runc-app",
"purl": "pkg:deb/ubuntu/runc-app@1.1.12-0ubuntu2~20.04.1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.1.12-0ubuntu2~20.04.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "golang-github-opencontainers-runc-dev",
"binary_version": "1.1.7-0ubuntu1~22.04.6"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "runc",
"purl": "pkg:deb/ubuntu/runc@1.1.7-0ubuntu1~22.04.6?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.1-0ubuntu2",
"1.0.1-0ubuntu3",
"1.0.3-0ubuntu1",
"1.1.0-0ubuntu1",
"1.1.0-0ubuntu1.1",
"1.1.4-0ubuntu1~22.04.1",
"1.1.4-0ubuntu1~22.04.2",
"1.1.4-0ubuntu1~22.04.3",
"1.1.7-0ubuntu1~22.04.1",
"1.1.7-0ubuntu1~22.04.2",
"1.1.7-0ubuntu1~22.04.4",
"1.1.7-0ubuntu1~22.04.5",
"1.1.7-0ubuntu1~22.04.6"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "runc",
"binary_version": "1.3.4-0ubuntu1~22.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "runc-app",
"purl": "pkg:deb/ubuntu/runc-app@1.3.4-0ubuntu1~22.04.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.1.12-0ubuntu2~22.04.1",
"1.2.5-0ubuntu1~22.04.1",
"1.3.0-0ubuntu2~22.04.1",
"1.3.3-0ubuntu1~22.04.2",
"1.3.3-0ubuntu1~22.04.3",
"1.3.4-0ubuntu1~22.04.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "golang-github-opencontainers-runc-dev",
"binary_version": "1.1.12+ds1-2ubuntu1.3"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "runc",
"purl": "pkg:deb/ubuntu/runc@1.1.12+ds1-2ubuntu1.3?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.1.7-0ubuntu2",
"1.1.10+ds1-1ubuntu1",
"1.1.10+ds1-1ubuntu2",
"1.1.12+ds1-1ubuntu1",
"1.1.12+ds1-2ubuntu1",
"1.1.12+ds1-2ubuntu1.1",
"1.1.12+ds1-2ubuntu1.2",
"1.1.12+ds1-2ubuntu1.3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "runc",
"binary_version": "1.3.4-0ubuntu1~24.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "runc-app",
"purl": "pkg:deb/ubuntu/runc-app@1.3.4-0ubuntu1~24.04.1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.1.10-0ubuntu1",
"1.1.12-0ubuntu1",
"1.1.12-0ubuntu2",
"1.1.12-0ubuntu3",
"1.1.12-0ubuntu3.1",
"1.2.5-0ubuntu1~24.04.1",
"1.3.0-0ubuntu2~24.04.1",
"1.3.3-0ubuntu1~24.04.2",
"1.3.3-0ubuntu1~24.04.3",
"1.3.4-0ubuntu1~24.04.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "golang-github-opencontainers-runc-dev",
"binary_version": "1.1.15+ds1-2ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "runc",
"purl": "pkg:deb/ubuntu/runc@1.1.15+ds1-2ubuntu1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.1.15+ds1-2ubuntu1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "runc",
"binary_version": "1.3.4-0ubuntu1~25.10.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "runc-app",
"purl": "pkg:deb/ubuntu/runc-app@1.3.4-0ubuntu1~25.10.1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.2.5-0ubuntu1",
"1.3.0-0ubuntu1",
"1.3.0-0ubuntu2",
"1.3.3-0ubuntu1~25.10.2",
"1.3.3-0ubuntu1~25.10.3",
"1.3.4-0ubuntu1~25.10.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "runc-stable",
"binary_version": "1.3.4-0ubuntu1~25.10.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "runc-stable",
"purl": "pkg:deb/ubuntu/runc-stable@1.3.4-0ubuntu1~25.10.1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.3.0-0ubuntu1",
"1.3.3-0ubuntu1~25.10.2",
"1.3.3-0ubuntu1~25.10.3",
"1.3.4-0ubuntu1~25.10.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "golang-github-opencontainers-runc-dev",
"binary_version": "1.3.3+ds1-2ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "runc",
"purl": "pkg:deb/ubuntu/runc@1.3.3+ds1-2ubuntu1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.1.15+ds1-2ubuntu1",
"1.3.3+ds1-2ubuntu1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "runc",
"binary_version": "1.4.0-0ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "runc-app",
"purl": "pkg:deb/ubuntu/runc-app@1.4.0-0ubuntu1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.3.0-0ubuntu2",
"1.3.3-0ubuntu1",
"1.3.3-0ubuntu2",
"1.4.0-0ubuntu1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "runc-stable",
"binary_version": "1.3.4-0ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "runc-stable",
"purl": "pkg:deb/ubuntu/runc-stable@1.3.4-0ubuntu1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.3.0-0ubuntu1",
"1.3.3-0ubuntu1",
"1.3.3-0ubuntu2",
"1.3.4-0ubuntu1"
]
}
],
"aliases": [],
"details": "runc is a CLI tool for spawning and running containers according to the OCI specification. In versions prior to 1.3.6, 1.4.0-rc.1, 1.4.0-rc.12, 1.5.0-rc.1, and 1.5.0-rc.1, when setting up the container rootfs, setupPtmx and setupDevSymlinks call os.Remove and os.Symlink with a filepath.Join string which allow an image with /dev as a symlink to trick runc into deleting files called ptmx on the host or creating a hardcoded set of symlinks with specific names and targets in an arbitrary pre-existing host directory. This issue is not exploitable under Docker, because Docker creates a top-level read-only layer that masks any malicious /dev\u00a0symlink present in the container image \u2014 unlike some other Linux container tooling, whose higher-level runtimes built on runc remain exposed to exploitation via a malicious image. This issue has been fixed in versions 1.3.6, 1.4.3 and 1.5.0.",
"id": "UBUNTU-CVE-2026-41579",
"modified": "2026-07-01T21:23:10Z",
"published": "2026-07-01T02:17:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-41579"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-41579"
},
{
"type": "REPORT",
"url": "https://www.openwall.com/lists/oss-security/2026/06/13/2"
},
{
"type": "REPORT",
"url": "https://github.com/opencontainers/runc/security/advisories/GHSA-xjvp-4fhw-gc47"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-41579"
]
}
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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