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[lxc-copy host-context hostname update follows symlink] (CVE-2026-100395)

0
Medium
VulnerabilityCVE-2026-100395gcveosvubuntu-cve-2026-100395cve-2026-100395ubuntu-14-04-ltsubuntu-pro-16-04-ltsubuntu-pro-18-04-ltsubuntu-pro-20-04-ltsubuntu-pro-22-04-ltsubuntu-pro-24-04-ltsubuntu-26-10ubuntu-pro-26-04-lts
Published: 09/29/2026 (09/29/2026, 00:00:00 UTC)
Source: GCVE Database
Product: lxc

Description

CVE-2026-100395 is a medium severity vulnerability in the lxc container management tool where the host-context hostname update operation follows symbolic links. This behavior could potentially lead to unintended modifications when handling hostnames during container copy operations. The vulnerability affects multiple specific versions of lxc, primarily those packaged for Ubuntu distributions. No CVSS score is provided, and there is no information about active exploitation or available patches.

Affected software

Ubuntu:14.04:LTSmore threats →ghsa
lxc
pkg:deb/ubuntu/lxc?arch=source&distro=trusty
Affected versions
=1.0.0~alpha1-0ubuntu11=1.0.0~alpha2-0ubuntu1=1.0.0~alpha2-0ubuntu3=1.0.0~alpha2-0ubuntu4=1.0.0~alpha2-0ubuntu5=1.0.0~alpha2-0ubuntu6=1.0.0~alpha3-0ubuntu1=1.0.0~alpha3-0ubuntu2=1.0.0~alpha3-0ubuntu3=1.0.0~alpha3-0ubuntu4=1.0.0~alpha3-0ubuntu5=1.0.0~alpha3-0ubuntu6=1.0.0~alpha3-0ubuntu7=1.0.0~alpha3-0ubuntu8=1.0.0~beta1-0ubuntu1=1.0.0~beta1-0ubuntu2=1.0.0~beta1-0ubuntu3=1.0.0~beta2-0ubuntu1=1.0.0~beta2-0ubuntu2=1.0.0~beta3-0ubuntu1=1.0.0~beta4-0ubuntu1=1.0.0~beta4-0ubuntu2=1.0.0~rc1-0ubuntu2=1.0.0~rc3-0ubuntu1=1.0.0~rc4-0ubuntu1=1.0.0-0ubuntu1=1.0.0-0ubuntu2=1.0.0-0ubuntu3=1.0.0-0ubuntu4=1.0.1-0ubuntu1=1.0.2-0ubuntu1=1.0.2-0ubuntu2=1.0.3-0ubuntu1=1.0.3-0ubuntu2=1.0.3-0ubuntu3=1.0.4-0ubuntu0.1=1.0.5-0ubuntu0.1=1.0.6-0ubuntu0.1=1.0.7-0ubuntu0.1=1.0.7-0ubuntu0.2=1.0.7-0ubuntu0.5=1.0.7-0ubuntu0.6=1.0.7-0ubuntu0.7=1.0.7-0ubuntu0.9=1.0.7-0ubuntu0.10=1.0.8-0ubuntu0.3=1.0.8-0ubuntu0.4=1.0.9-0ubuntu2=1.0.9-0ubuntu3=1.0.10-0ubuntu1=1.0.10-0ubuntu1.1
Ubuntu:Pro:16.04:LTSmore threats →ghsa
lxc
pkg:deb/ubuntu/lxc?arch=source&distro=esm-infra-legacy/xenial
Affected versions
=1.1.4-0ubuntu1=1.1.4-0ubuntu1.1=1.1.4-0ubuntu3=1.1.5-0ubuntu1=1.1.5-0ubuntu2=1.1.5-0ubuntu3=1.1.5-0ubuntu4=1.1.5-0ubuntu5=1.1.5-0ubuntu6=2.0.0~beta2-0ubuntu2=2.0.0~rc1-0ubuntu1=2.0.0~rc2-0ubuntu2=2.0.0~rc3-0ubuntu1=2.0.0~rc3-0ubuntu2=2.0.0~rc3-0ubuntu3=2.0.0~rc4-0ubuntu1=2.0.0~rc5-0ubuntu1=2.0.0~rc9-0ubuntu1=2.0.0~rc10-0ubuntu1=2.0.0~rc10-0ubuntu2=2.0.0~rc11-0ubuntu1=2.0.0~rc12-0ubuntu1=2.0.0~rc13-0ubuntu2=2.0.0~rc14-0ubuntu2=2.0.0~rc15-0ubuntu1=2.0.0-0ubuntu1=2.0.0-0ubuntu2=2.0.1-0ubuntu1~16.04.1=2.0.3-0ubuntu1~ubuntu16.04.1=2.0.4-0ubuntu1~ubuntu16.04.2=2.0.5-0ubuntu1~ubuntu16.04.1=2.0.5-0ubuntu1~ubuntu16.04.2=2.0.5-0ubuntu1~ubuntu16.04.3=2.0.6-0ubuntu1~ubuntu16.04.1=2.0.6-0ubuntu1~ubuntu16.04.2=2.0.7-0ubuntu1~16.04.1=2.0.7-0ubuntu1~16.04.2=2.0.8-0ubuntu1~16.04.2=2.0.11-0ubuntu1~16.04.3=2.0.11-0ubuntu1~16.04.3+esm1
Ubuntu:Pro:18.04:LTSmore threats →ghsa
lxc
pkg:deb/ubuntu/lxc?arch=source&distro=esm-infra/bionic
Affected versions
=2.1.0-0ubuntu1=2.1.1-0ubuntu1=3.0.0~beta1-0ubuntu3=3.0.0~beta2-0ubuntu2=3.0.0~beta3-0ubuntu1=3.0.0~beta4-0ubuntu1=3.0.0-0ubuntu1=3.0.0-0ubuntu2=3.0.1-0ubuntu1~18.04.1=3.0.1-0ubuntu1~18.04.2=3.0.2-0ubuntu1~18.04.1=3.0.3-0ubuntu1~18.04.1=3.0.3-0ubuntu1~18.04.3=3.0.3-0ubuntu1~18.04.3+esm1
Ubuntu:Pro:20.04:LTSmore threats →ghsa
lxc
pkg:deb/ubuntu/lxc?arch=source&distro=esm-apps/focal
Affected versions
=3.0.4-0ubuntu1=3.0.4-0ubuntu2=1:4.0.0-0ubuntu2=1:4.0.1-0ubuntu1=1:4.0.1-0ubuntu2=1:4.0.2-0ubuntu1=1:4.0.6-0ubuntu1~20.04.1=1:4.0.12-0ubuntu1~20.04.1=1:4.0.12-0ubuntu1~20.04.1+esm1
Ubuntu:Pro:22.04:LTSmore threats →ghsa
lxc
pkg:deb/ubuntu/lxc?arch=source&distro=esm-apps/jammy
Affected versions
=1:4.0.10-0ubuntu5=1:4.0.12-0ubuntu1=1:4.0.12-0ubuntu2=1:5.0.0~git2209-g5a7b9ce67-0ubuntu1=1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1=1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1
Ubuntu:Pro:24.04:LTSmore threats →ghsa
lxc
pkg:deb/ubuntu/lxc?arch=source&distro=esm-apps/noble
Affected versions
=1:5.0.1-0ubuntu7=1:5.0.1-0ubuntu8=1:5.0.3-2ubuntu5=1:5.0.3-2ubuntu7=1:5.0.3-2ubuntu7.1=1:5.0.3-2ubuntu7.2=1:5.0.3-2ubuntu7.3=1:5.0.3-2ubuntu7.3+esm1
Ubuntu:26.10more threats →ghsa
lxc
pkg:deb/ubuntu/lxc?arch=source&distro=stonking
Affected versions
=1:6.0.6-1=1:7.0.0-2ubuntu1=1:7.0.0-2ubuntu2
Ubuntu:Pro:26.04:LTSmore threats →ghsa
lxc
pkg:deb/ubuntu/lxc?arch=source&distro=esm-apps/resolute
Affected versions
=1:6.0.4-4ubuntu1=1:6.0.6-1=1:6.0.6-1ubuntu1=1:6.0.6-1ubuntu1+esm1

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AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 10/17/2026, 22:51:48 UTC

Technical Analysis

The vulnerability identified as CVE-2026-100395 concerns the lxc tool's 'lxc-copy' functionality, specifically in the host-context hostname update process. The update operation follows symbolic links (symlinks), which may cause the hostname update to affect unintended files or locations. This could lead to security issues related to improper hostname management during container copying. The affected versions are numerous and correspond to various Ubuntu package versions of lxc. No detailed technical or exploit information is provided, and no patch or remediation details are available in the provided data.

Potential Impact

The impact is classified as medium severity. The vulnerability could allow unintended hostname changes due to following symlinks during container copy operations, potentially affecting system or container integrity. There is no evidence of known exploits in the wild. The exact consequences depend on the environment and usage but may include misconfiguration or unauthorized changes in container hostnames.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix information is provided, users should monitor vendor communications for updates. Until a fix is available, cautious handling of lxc-copy operations and validation of hostname updates may help reduce risk.

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Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2026-100395
Osv Schema Version
1.7.0
Ecosystems
["Ubuntu:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:Pro:22.04:LTS","Ubuntu:Pro:24.04:LTS","Ubuntu:26.10","Ubuntu:Pro:26.04:LTS"]

Threat ID: 6ad3f5072cdf04f656657bf2

Added to database: 10/17/2026, 22:21:59 UTC

Last enriched: 10/17/2026, 22:51:48 UTC

Last updated: 10/17/2026, 22:51:48 UTC

Views: 2

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