UBUNTU-CVE-2021-44731

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2021-44731
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-44731.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2021-44731
Upstream
Downstream
Related
Published
2022-02-17T17:00:00Z
Modified
2025-10-15T16:51:40Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - high
Summary
[none]
Details

A race condition existed in the snapd 2.54.2 snap-confine binary when preparing a private mount namespace for a snap. This could allow a local attacker to gain root privileges by bind-mounting their own contents inside the snap's private mount namespace and causing snap-confine to execute arbitrary code and hence gain privilege escalation. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1

References

Affected packages

Ubuntu:Pro:14.04:LTS / snapd

Package

Name
snapd
Purl
pkg:deb/ubuntu/snapd@2.54.3+14.04~esm1?arch=source&distro=trusty/esm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.54.3+14.04~esm1

Affected versions

2.*

2.21~14.04.2
2.22.2~14.04
2.22.3~14.04
2.22.6~14.04
2.23.1~14.04
2.24.1~14.04
2.25~14.04
2.26.10~14.04
2.27.5~14.04
2.28.5~14.04
2.29.4.2~14.04
2.32.3.2~14.04
2.32.9~14.04
2.33.1~14.04
2.34.2~14.04
2.34.2~14.04.1
2.37.4~14.04.1
2.38~14.04

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.54.3+14.04~esm1",
            "binary_name": "golang-github-snapcore-snapd-dev"
        },
        {
            "binary_version": "2.54.3+14.04~esm1",
            "binary_name": "golang-github-ubuntu-core-snappy-dev"
        },
        {
            "binary_version": "2.54.3+14.04~esm1",
            "binary_name": "snap-confine"
        },
        {
            "binary_version": "2.54.3+14.04~esm1",
            "binary_name": "snapd"
        },
        {
            "binary_version": "2.54.3+14.04~esm1",
            "binary_name": "snapd-xdg-open"
        },
        {
            "binary_version": "2.54.3+14.04~esm1",
            "binary_name": "ubuntu-core-launcher"
        },
        {
            "binary_version": "2.54.3+14.04~esm1",
            "binary_name": "ubuntu-core-snapd-units"
        },
        {
            "binary_version": "2.54.3+14.04~esm1",
            "binary_name": "ubuntu-snappy"
        },
        {
            "binary_version": "2.54.3+14.04~esm1",
            "binary_name": "ubuntu-snappy-cli"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Ubuntu:Pro:16.04:LTS / snapd

Package

Name
snapd
Purl
pkg:deb/ubuntu/snapd@2.54.3+16.04~esm2?arch=source&distro=esm-infra/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.54.3+16.04~esm2

Affected versions

1.*

1.9
1.9.1.1
1.9.2

2.*

2.0
2.0.1
2.0.2
2.0.3
2.0.5
2.0.8
2.0.9
2.0.10
2.11+0.16.04
2.12+0.16.04
2.13
2.14.2~16.04
2.15.2ubuntu1
2.16ubuntu3
2.17.1ubuntu1
2.20.1ubuntu1
2.21
2.22.2
2.22.3
2.22.6
2.23.1
2.24.1
2.25
2.26.10
2.27.5
2.28.5
2.29.4.2
2.32.3.2
2.32.9
2.33.1ubuntu2
2.34.2
2.34.2ubuntu0.1
2.37.4
2.37.4ubuntu0.1
2.38
2.39.2
2.39.2ubuntu0.2
2.40
2.42.1
2.45.1
2.45.1ubuntu0.2
2.46.1
2.47.1
2.48
2.48.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.54.3+16.04~esm2",
            "binary_name": "golang-github-snapcore-snapd-dev"
        },
        {
            "binary_version": "2.54.3+16.04~esm2",
            "binary_name": "golang-github-ubuntu-core-snappy-dev"
        },
        {
            "binary_version": "2.54.3+16.04~esm2",
            "binary_name": "snap-confine"
        },
        {
            "binary_version": "2.54.3+16.04~esm2",
            "binary_name": "snapd"
        },
        {
            "binary_version": "2.54.3+16.04~esm2",
            "binary_name": "snapd-xdg-open"
        },
        {
            "binary_version": "2.54.3+16.04~esm2",
            "binary_name": "ubuntu-core-launcher"
        },
        {
            "binary_version": "2.54.3+16.04~esm2",
            "binary_name": "ubuntu-core-snapd-units"
        },
        {
            "binary_version": "2.54.3+16.04~esm2",
            "binary_name": "ubuntu-snappy"
        },
        {
            "binary_version": "2.54.3+16.04~esm2",
            "binary_name": "ubuntu-snappy-cli"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Ubuntu:18.04:LTS / snapd

Package

Name
snapd
Purl
pkg:deb/ubuntu/snapd@2.54.3+18.04?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.54.3+18.04

Affected versions

2.*

2.28.5+17.10
2.29.4.1+18.04
2.29.4.2+18.04
2.31.1+18.04
2.32+18.04~pre5
2.32+18.04~pre6
2.32+18.04
2.32.3.2+18.04
2.32.5+18.04
2.32.8+18.04
2.32.9+18.04
2.33.1+18.04ubuntu2
2.34.2+18.04
2.34.2+18.04.1
2.37.1+18.04
2.37.1.1+18.04
2.37.4+18.04
2.37.4+18.04.1
2.38+18.04
2.39.2+18.04
2.40+18.04
2.42.1+18.04
2.45.1+18.04
2.45.1+18.04.2
2.46.1+18.04
2.47.1+18.04
2.48+18.04
2.48.3+18.04
2.49.2+18.04
2.51.1+18.04
2.54.2+18.04ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.54.3+18.04",
            "binary_name": "golang-github-snapcore-snapd-dev"
        },
        {
            "binary_version": "2.54.3+18.04",
            "binary_name": "golang-github-ubuntu-core-snappy-dev"
        },
        {
            "binary_version": "2.54.3+18.04",
            "binary_name": "snap-confine"
        },
        {
            "binary_version": "2.54.3+18.04",
            "binary_name": "snapd"
        },
        {
            "binary_version": "2.54.3+18.04",
            "binary_name": "snapd-xdg-open"
        },
        {
            "binary_version": "2.54.3+18.04",
            "binary_name": "ubuntu-core-launcher"
        },
        {
            "binary_version": "2.54.3+18.04",
            "binary_name": "ubuntu-core-snapd-units"
        },
        {
            "binary_version": "2.54.3+18.04",
            "binary_name": "ubuntu-snappy"
        },
        {
            "binary_version": "2.54.3+18.04",
            "binary_name": "ubuntu-snappy-cli"
        }
    ],
    "availability": "No subscription required"
}

Ubuntu:20.04:LTS / snapd

Package

Name
snapd
Purl
pkg:deb/ubuntu/snapd@2.54.3+20.04.1?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.54.3+20.04.1

Affected versions

2.*

2.41+19.10.1
2.42.1+20.04
2.43.3+git1.8109f8
2.44~pre1+20.04
2.44+20.04
2.44.2+20.04
2.44.3+20.04
2.45.1+20.04
2.45.1+20.04.2
2.46.1+20.04
2.47.1+20.04
2.48+20.04
2.48.3+20.04
2.49.2+20.04
2.51.1+20.04ubuntu2
2.54.2+20.04ubuntu2
2.54.3+20.04

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.54.3+20.04.1",
            "binary_name": "golang-github-snapcore-snapd-dev"
        },
        {
            "binary_version": "2.54.3+20.04.1",
            "binary_name": "golang-github-ubuntu-core-snappy-dev"
        },
        {
            "binary_version": "2.54.3+20.04.1",
            "binary_name": "snap-confine"
        },
        {
            "binary_version": "2.54.3+20.04.1",
            "binary_name": "snapd"
        },
        {
            "binary_version": "2.54.3+20.04.1",
            "binary_name": "snapd-xdg-open"
        },
        {
            "binary_version": "2.54.3+20.04.1",
            "binary_name": "ubuntu-core-launcher"
        },
        {
            "binary_version": "2.54.3+20.04.1",
            "binary_name": "ubuntu-core-snapd-units"
        },
        {
            "binary_version": "2.54.3+20.04.1",
            "binary_name": "ubuntu-snappy"
        },
        {
            "binary_version": "2.54.3+20.04.1",
            "binary_name": "ubuntu-snappy-cli"
        }
    ],
    "availability": "No subscription required"
}