DEBIAN-CVE-2026-100395

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Source
https://security-tracker.debian.org/tracker/CVE-2026-100395
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-100395.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-100395
Upstream
Published
2026-11-05T22:17:41Z
Modified
2026-11-11T06:00:13Z
Severity
  • 6.8 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator
Summary
[none]
Details

LXC is a userspace interface for the Linux kernel containment features used to create and manage system containers. In LXC 7.0.0 and earlier, lxc-copy and the public liblxc clone() API can follow attacker-controlled symbolic links while updating /etc/hostname in a copied container root filesystem. The affected surfaces are lxc-copy and liblxc's public lxc_container::clone() API. The privileged cloning process must run as root. The source rootfs must be attacker-controlled or less trusted. A symlink can be placed at etc/hostname or in an intermediate component. The clone operation preserves the symlink before updating the hostname. The vulnerable write truncates and overwrites an existing file outside the destination rootfs. When root clones an untrusted container without LXC_CLONE_KEEPNAME, the copied symlink can resolve outside the destination rootfs and cause the privileged process to overwrite an existing host file with the destination container name. Unprivileged use and managers with independent cloning implementations are not affected. LXC_CLONE_KEEPNAME avoids the hostname update and therefore the affected write.

References

Affected packages

Debian:12 / lxc

Package

Name
lxc
Purl
pkg:deb/debian/lxc?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:5.*
1:5.0.2-1
1:5.0.2-1+deb12u1
1:5.0.2-1+deb12u2
1:5.0.2-1+deb12u3
1:5.0.2-1+deb12u4
1:5.0.3-1
1:5.0.3-2
1:5.0.3-2.1~exp1
1:5.0.3-2.1
1:5.0.3-3
1:6.*
1:6.0.0a-1
1:6.0.1-1
1:6.0.2-1
1:6.0.3-1
1:6.0.3-2
1:6.0.4-1
1:6.0.4-2
1:6.0.4-3
1:6.0.4-4
1:6.0.5-1
1:6.0.5-2
1:6.0.6-1
1:6.0.6-2
1:6.0.6-3
1:7.*
1:7.0.0-1
1:7.0.0-2
1:7.0.0-3

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-100395.json"

Debian:13 / lxc

Package

Name
lxc
Purl
pkg:deb/debian/lxc?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1:6.*
1:6.0.4-4
1:6.0.4-4+deb13u1
1:6.0.4-4+deb13u2
1:6.0.4-4+deb13u3
1:6.0.4-4+deb13u4
1:6.0.5-1
1:6.0.5-2
1:6.0.6-1
1:6.0.6-2
1:6.0.6-3
1:7.*
1:7.0.0-1
1:7.0.0-2
1:7.0.0-3

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-100395.json"

Debian:14 / lxc

Package

Name
lxc
Purl
pkg:deb/debian/lxc?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1:7.0.0-3

Affected versions

1:6.*
1:6.0.4-4
1:6.0.5-1
1:6.0.5-2
1:6.0.6-1
1:6.0.6-2
1:6.0.6-3
1:7.*
1:7.0.0-1
1:7.0.0-2

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-100395.json"