CVE-2020-27352: When generating the systemd service units for the docker snap (and other similar snaps), snapd does not specif

Q: How do I fix CVE-2020-27352?

snapd: upgrade to 2.48.3; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2020-27352 being exploited?

CVE-2020-27352 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-27352 affect?

CVE-2020-27352 affects snapd, ubuntu linux. Severity is critical (CVSS 9.3). When generating the systemd service units for the docker snap (and other similar snaps), snapd does not specify Delegate=yes - as a result systemd will move processes from the containers created and managed by these snaps into the cgroup of

Q: How urgent is CVE-2020-27352?

Priority 47/100. Critical severity; Public exploit reference; On your watchlist

This month

CRITICAL 9.3WATCHLISTUPGRADEMITIGATE

CVE-2020-27352 is a critical-severity flaw (CVSS 9.3) affecting snapd, ubuntu linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

When generating the systemd service units for the docker snap (and other similar snaps), snapd does not specify Delegate=yes - as a result systemd will move processes from the containers created and managed by these snaps into the cgroup of the main daemon within the snap itself when reloading system units. This may grant additional privileges to a container within the snap that were not originally intended.

Why this priority

Critical severity
Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.3 (Critical)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-269
Published	2024-06-21
Last modified	2026-06-17

Publisher (CNA): Canonical Ltd. · Vendor: canonical

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-06-21 20:15 UTCPublished CVE record published
2026-06-17 03:09 UTCUpdated Record last modified

canonical snapd UPGRADE

Affected: < 2.48.3

Fixed in: 2.48.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy snapd || rpm -q snapd || snapd --version

2. UPGRADE to 2.48.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade snapd

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade snapd

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

canonical ubuntu linux MITIGATE

Affected: 16.04 · 18.04 · 20.04 · 20.10

Fixed in: no fixed release known

Safe to downgrade to: a release before 16.04

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-27352?

snapd: upgrade to 2.48.3; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-27352 being exploited?

CVE-2020-27352 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-27352 affect?

CVE-2020-27352 affects snapd, ubuntu linux. Severity is critical (CVSS 9.3). When generating the systemd service units for the docker snap (and other similar snaps), snapd does not specify Delegate=yes - as a result systemd will move processes from the containers created and managed by these snaps into the cgroup of

How urgent is CVE-2020-27352?

Priority 47/100. Critical severity; Public exploit reference; On your watchlist

Software pages

Docker vulnerabilities · Ubuntu vulnerabilities

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References

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