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[USN-8826-1] LXC vulnerabilities

Posted on 28 September 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8826-1
September 28, 2026

lxc vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in LXC.

Software Description:
- lxc: Linux Containers userspace tools

Details:

Maher Azzouzi discovered that LXC did not correctly handle logging
certain failure messages. An attacker could possibly use this issue
to leak sensitive information. This issue only affected
Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS,
Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2022-47952)

Sam Sanoop discovered that LXC did not correctly handle certain forms
of user authorization. An attacker could possibly use this issue to
cause a denial of service. (CVE-2026-39402)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
liblxc-common 1:6.0.6-1ubuntu1+esm1
Available with Ubuntu Pro
liblxc1t64 1:6.0.6-1ubuntu1+esm1
Available with Ubuntu Pro
libpam-cgfs 1:6.0.6-1ubuntu1+esm1
Available with Ubuntu Pro
lxc 1:6.0.6-1ubuntu1+esm1
Available with Ubuntu Pro
lxc-dev 1:6.0.6-1ubuntu1+esm1
Available with Ubuntu Pro
lxc-tests 1:6.0.6-1ubuntu1+esm1
Available with Ubuntu Pro

Ubuntu 24.04 LTS
liblxc-common 1:5.0.3-2ubuntu7.3+esm1
Available with Ubuntu Pro
liblxc-dev 1:5.0.3-2ubuntu7.3+esm1
Available with Ubuntu Pro
liblxc1t64 1:5.0.3-2ubuntu7.3+esm1
Available with Ubuntu Pro
libpam-cgfs 1:5.0.3-2ubuntu7.3+esm1
Available with Ubuntu Pro
lxc 1:5.0.3-2ubuntu7.3+esm1
Available with Ubuntu Pro
lxc-dev 1:5.0.3-2ubuntu7.3+esm1
Available with Ubuntu Pro
lxc-tests 1:5.0.3-2ubuntu7.3+esm1
Available with Ubuntu Pro
lxc-utils 1:5.0.3-2ubuntu7.3+esm1
Available with Ubuntu Pro
lxc1 1:5.0.3-2ubuntu7.3+esm1
Available with Ubuntu Pro

Ubuntu 22.04 LTS
liblxc-common 1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1
Available with Ubuntu Pro
liblxc-dev 1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1
Available with Ubuntu Pro
liblxc1 1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1
Available with Ubuntu Pro
libpam-cgfs 1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1
Available with Ubuntu Pro
lxc 1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1
Available with Ubuntu Pro
lxc-dev 1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1
Available with Ubuntu Pro
lxc-utils 1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1
Available with Ubuntu Pro
lxc1 1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1
Available with Ubuntu Pro

Ubuntu 20.04 LTS
liblxc-common 1:4.0.12-0ubuntu1~20.04.1+esm1
Available with Ubuntu Pro
liblxc-dev 1:4.0.12-0ubuntu1~20.04.1+esm1
Available with Ubuntu Pro
liblxc1 1:4.0.12-0ubuntu1~20.04.1+esm1
Available with Ubuntu Pro
libpam-cgfs 1:4.0.12-0ubuntu1~20.04.1+esm1
Available with Ubuntu Pro
lxc 1:4.0.12-0ubuntu1~20.04.1+esm1
Available with Ubuntu Pro
lxc-dev 1:4.0.12-0ubuntu1~20.04.1+esm1
Available with Ubuntu Pro
lxc-utils 1:4.0.12-0ubuntu1~20.04.1+esm1
Available with Ubuntu Pro
lxc1 1:4.0.12-0ubuntu1~20.04.1+esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
liblxc-common 3.0.3-0ubuntu1~18.04.3+esm1
Available with Ubuntu Pro
liblxc-dev 3.0.3-0ubuntu1~18.04.3+esm1
Available with Ubuntu Pro
liblxc1 3.0.3-0ubuntu1~18.04.3+esm1
Available with Ubuntu Pro
libpam-cgfs 3.0.3-0ubuntu1~18.04.3+esm1
Available with Ubuntu Pro
lxc 3.0.3-0ubuntu1~18.04.3+esm1
Available with Ubuntu Pro
lxc-dev 3.0.3-0ubuntu1~18.04.3+esm1
Available with Ubuntu Pro
lxc-utils 3.0.3-0ubuntu1~18.04.3+esm1
Available with Ubuntu Pro
lxc1 3.0.3-0ubuntu1~18.04.3+esm1
Available with Ubuntu Pro

Ubuntu 16.04 LTS
liblxc1 2.0.11-0ubuntu1~16.04.3+esm1
Available with Ubuntu Pro
lua-lxc 2.0.11-0ubuntu1~16.04.3+esm1
Available with Ubuntu Pro
lxc 2.0.11-0ubuntu1~16.04.3+esm1
Available with Ubuntu Pro
lxc-common 2.0.11-0ubuntu1~16.04.3+esm1
Available with Ubuntu Pro
lxc-dev 2.0.11-0ubuntu1~16.04.3+esm1
Available with Ubuntu Pro
lxc-templates 2.0.11-0ubuntu1~16.04.3+esm1
Available with Ubuntu Pro
lxc-tests 2.0.11-0ubuntu1~16.04.3+esm1
Available with Ubuntu Pro
lxc1 2.0.11-0ubuntu1~16.04.3+esm1
Available with Ubuntu Pro
python3-lxc 2.0.11-0ubuntu1~16.04.3+esm1
Available with Ubuntu Pro

After a standard system update you need to restart LXC containers to
make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8826-1
CVE-2022-47952, CVE-2026-39402

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