CVE catalog
CVE-2026-39402
lxc is a Linux container runtime. In the setuid helper lxc-user-nic, the delete path contains a logic flaw in the find_line() function that allows an unprivileged user to delete OVS-attached network i
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.16% · Oct 25, 2026
lxc is a Linux container runtime. In the setuid helper lxc-user-nic, the delete path contains a logic flaw in the find_line() function that allows an unprivileged user to delete OVS-attached network interfaces belonging to other users. When lxc-user-nic delete scans its NIC database to authorize a deletion request, the interface name comparison can set the authorization flag based on a name match alone, even when the ownership, type, and link fields in that database entry belong to a different user. The vulnerable check sits after the goto next label handling, meaning it is reachable on lines where earlier ownership checks failed or were skipped. Because nothing downstream of this authorization signal re-verifies that the matched database line actually belongs to the caller, an unprivileged attacker with a valid lxc-usernet policy entry can trigger deletion of another user's OVS port on the same bridge. This is limited to multi-tenant environments using lxc-user-nic with OpenVSwitch bridges. The impact is denial of service - one tenant can repeatedly disconnect networking from containers run by another tenant on shared infrastructure. This is patched in version 7.0.0.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | lxc | sid | 1:7.0.0-2 | fixed |
| Debian | lxc | forky | 1:7.0.0-2 | fixed |
| Debian | lxc | trixie | 1:6.0.4-4+deb13u4 | fixed |
| Debian | lxc | bookworm | 1:5.0.2-1+deb12u4 | fixed |
| Cpe | lxc | Not reported | 7.0.0 | fixed |
| Ubuntu | lxc | noble | 1:5.0.3-2ubuntu7.3+esm1 | fixed |
| Ubuntu | liblxc-common | noble | 1:5.0.3-2ubuntu7.3+esm1 | fixed |
| Ubuntu | liblxc-dev | noble | 1:5.0.3-2ubuntu7.3+esm1 | fixed |
| Ubuntu | liblxc1t64 | noble | 1:5.0.3-2ubuntu7.3+esm1 | fixed |
| Ubuntu | libpam-cgfs | noble | 1:5.0.3-2ubuntu7.3+esm1 | fixed |
| Ubuntu | lxc-dev | noble | 1:5.0.3-2ubuntu7.3+esm1 | fixed |
| Ubuntu | lxc-tests | noble | 1:5.0.3-2ubuntu7.3+esm1 | fixed |
| Ubuntu | lxc-utils | noble | 1:5.0.3-2ubuntu7.3+esm1 | fixed |
| Ubuntu | lxc1 | noble | 1:5.0.3-2ubuntu7.3+esm1 | fixed |
| Ubuntu | lxc | 14.04 | 1.0.0~alpha1-0ubuntu11 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~alpha2-0ubuntu1 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~alpha2-0ubuntu3 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~alpha2-0ubuntu4 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~alpha2-0ubuntu5 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~alpha2-0ubuntu6 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~alpha3-0ubuntu1 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~alpha3-0ubuntu2 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~alpha3-0ubuntu3 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~alpha3-0ubuntu4 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~alpha3-0ubuntu5 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~alpha3-0ubuntu6 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~alpha3-0ubuntu7 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~alpha3-0ubuntu8 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~beta1-0ubuntu1 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~beta1-0ubuntu2 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~beta1-0ubuntu3 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~beta2-0ubuntu1 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~beta2-0ubuntu2 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~beta3-0ubuntu1 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~beta4-0ubuntu1 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~beta4-0ubuntu2 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~rc1-0ubuntu2 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~rc3-0ubuntu1 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0~rc4-0ubuntu1 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0-0ubuntu1 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0-0ubuntu2 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0-0ubuntu3 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.0-0ubuntu4 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.1-0ubuntu1 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.2-0ubuntu1 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.2-0ubuntu2 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.3-0ubuntu1 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.3-0ubuntu2 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.3-0ubuntu3 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.4-0ubuntu0.1 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.5-0ubuntu0.1 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.6-0ubuntu0.1 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.7-0ubuntu0.1 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.7-0ubuntu0.2 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.7-0ubuntu0.5 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.7-0ubuntu0.6 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.7-0ubuntu0.7 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.7-0ubuntu0.9 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.7-0ubuntu0.10 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.8-0ubuntu0.3 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.8-0ubuntu0.4 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.9-0ubuntu2 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.9-0ubuntu3 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.10-0ubuntu1 | vulnerable |
| Ubuntu | lxc | 14.04 | 1.0.10-0ubuntu1.1 | vulnerable |
| Ubuntu | lxc | pro | 1:6.0.4-4ubuntu1 | vulnerable |
| Ubuntu | lxc | pro | 1:6.0.6-1 | vulnerable |
| Ubuntu | lxc | pro | 1:6.0.6-1ubuntu1 | vulnerable |
| Ubuntu | lxc | pro | 1:6.0.6-1ubuntu1+esm1 | fixed |
| Ubuntu | lxc | 25.10 | 1:6.0.3-1 | vulnerable |
| Ubuntu | lxc | 25.10 | 1:6.0.4-2 | vulnerable |
| Ubuntu | lxc | 25.10 | 1:6.0.4-3 | vulnerable |
| Ubuntu | lxc | 25.10 | 1:6.0.4-4 | vulnerable |
| Ubuntu | lxc | 25.10 | 1:6.0.4-4ubuntu1 | vulnerable |
| Opensuse | incus | tumbleweed | 7.4-1.1 | fixed |
| Opensuse | lxc | tumbleweed | 7.0.0-1.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | lxc | source | sid | 1:7.0.0-1 | not yet assigned | Not reported | Not reported |
| Debian | lxc | source | forky | 1:7.0.0-1 | not yet assigned | Not reported | Not reported |
| Debian | lxc | source | trixie | 1:6.0.4-4+deb13u3 | not yet assigned | Not reported | Not reported |
| Debian | lxc | source | bookworm | 1:5.0.2-1+deb12u4 | not yet assigned | Not reported | Not reported |
| Cpe | lxc | cpe | Not reported | 7.0.0 | Not reported | Not reported | Not reported |
| Ubuntu | lxc | deb | noble | 1:5.0.3-2ubuntu7.3+esm1 | Not reported | Not reported | Not reported |
| Ubuntu | liblxc-common | deb | noble | 1:5.0.3-2ubuntu7.3+esm1 | Not reported | Not reported | Not reported |
| Ubuntu | liblxc-dev | deb | noble | 1:5.0.3-2ubuntu7.3+esm1 | Not reported | Not reported | Not reported |
| Ubuntu | liblxc1t64 | deb | noble | 1:5.0.3-2ubuntu7.3+esm1 | Not reported | Not reported | Not reported |
| Ubuntu | libpam-cgfs | deb | noble | 1:5.0.3-2ubuntu7.3+esm1 | Not reported | Not reported | Not reported |
| Ubuntu | lxc-dev | deb | noble | 1:5.0.3-2ubuntu7.3+esm1 | Not reported | Not reported | Not reported |
| Ubuntu | lxc-tests | deb | noble | 1:5.0.3-2ubuntu7.3+esm1 | Not reported | Not reported | Not reported |
| Ubuntu | lxc-utils | deb | noble | 1:5.0.3-2ubuntu7.3+esm1 | Not reported | Not reported | Not reported |
| Ubuntu | lxc1 | deb | noble | 1:5.0.3-2ubuntu7.3+esm1 | Not reported | Not reported | Not reported |
| Ubuntu | lxc | deb | pro | 1:6.0.6-1ubuntu1+esm1 | Not reported | UBUNTU-CVE-2026-39402 | Not reported |
| Opensuse | incus | rpm | tumbleweed | 7.4-1.1 | Not reported | OPENSUSE-SU-2026:11651-1 | Not reported |
| Opensuse | lxc | rpm | tumbleweed | 7.0.0-1.1 | Not reported | OPENSUSE-SU-2026:10678-1 | Not reported |
OpenFactory catalog packages
[openSUSE Tumbleweed]
- [incus]Affected
Source package: [incus]
Details (1)
6.23-3.1· x86_64 · tumbleweedAffected · Fixed:
7.4-1.1nvd · incus · opensuse · tumbleweed
- [incus-cli]Unknown
Source package: [incus]
Details (1)
6.23-3.1· x86_64 · tumbleweedUnknown · Fixed:
7.4-1.1Version impact unknown
nvd · incus · opensuse · tumbleweed
- [incus-cli-bash-completion]Unknown
Source package: [incus]
Details (1)
6.23-3.1· noarch · tumbleweedUnknown · Fixed:
7.4-1.1Version impact unknown
nvd · incus · opensuse · tumbleweed
- [incus-cli-fish-completion]Unknown
Source package: [incus]
Details (1)
6.23-3.1· noarch · tumbleweedUnknown · Fixed:
7.4-1.1Version impact unknown
nvd · incus · opensuse · tumbleweed
- [incus-cli-zsh-completion]Unknown
Source package: [incus]
Details (1)
6.23-3.1· noarch · tumbleweedUnknown · Fixed:
7.4-1.1Version impact unknown
nvd · incus · opensuse · tumbleweed
- [incus-tools]Unknown
Source package: [incus]
Details (1)
6.23-3.1· x86_64 · tumbleweedUnknown · Fixed:
7.4-1.1Version impact unknown
nvd · incus · opensuse · tumbleweed
- [liblxc1]Unknown
Source package: [lxc]
Details (1)
7.0.0-1.3· x86_64 · tumbleweedUnknown · Fixed:
7.0.0-1.1Version impact unknown
nvd · lxc · opensuse · tumbleweed
- [liblxc-devel]Unknown
Source package: [lxc]
Details (1)
7.0.0-1.3· x86_64 · tumbleweedUnknown · Fixed:
7.0.0-1.1Version impact unknown
nvd · lxc · opensuse · tumbleweed
- [lxc-bash-completion]Unknown
Source package: [lxc]
Details (1)
7.0.0-1.3· noarch · tumbleweedUnknown · Fixed:
7.0.0-1.1Version impact unknown
nvd · lxc · opensuse · tumbleweed
- [lxc-ja-doc]Unknown
Source package: [lxc]
Details (1)
7.0.0-1.3· noarch · tumbleweedUnknown · Fixed:
7.0.0-1.1Version impact unknown
nvd · lxc · opensuse · tumbleweed
- [lxc-ko-doc]Unknown
Source package: [lxc]
Details (1)
7.0.0-1.3· noarch · tumbleweedUnknown · Fixed:
7.0.0-1.1Version impact unknown
nvd · lxc · opensuse · tumbleweed
- [pam_cgfs]Unknown
Source package: [lxc]
Details (1)
7.0.0-1.3· x86_64 · tumbleweedUnknown · Fixed:
7.0.0-1.1Version impact unknown
nvd · lxc · opensuse · tumbleweed
[Debian 12 (Bookworm)]
- [liblxc1]Fixed
Source package: [lxc]
Details (2)
1:5.0.2-1+deb12u4· amd64 · bookwormFixed · Fixed:
1:5.0.2-1+deb12u4nvd · lxc · debian · bookworm; nvd · lxc · debian · 12
1:5.0.2-1+deb12u4· arm64 · bookwormFixed · Fixed:
1:5.0.2-1+deb12u4nvd · lxc · debian · bookworm; nvd · lxc · debian · 12
- [liblxc-common]Fixed
Source package: [lxc]
Details (2)
1:5.0.2-1+deb12u4· amd64 · bookwormFixed · Fixed:
1:5.0.2-1+deb12u4nvd · lxc · debian · bookworm; nvd · lxc · debian · 12
1:5.0.2-1+deb12u4· arm64 · bookwormFixed · Fixed:
1:5.0.2-1+deb12u4nvd · lxc · debian · bookworm; nvd · lxc · debian · 12
- [libpam-cgfs]Fixed
Source package: [lxc]
Details (2)
1:5.0.2-1+deb12u4· amd64 · bookwormFixed · Fixed:
1:5.0.2-1+deb12u4nvd · lxc · debian · bookworm; nvd · lxc · debian · 12
1:5.0.2-1+deb12u4· arm64 · bookwormFixed · Fixed:
1:5.0.2-1+deb12u4nvd · lxc · debian · bookworm; nvd · lxc · debian · 12
- [lxc]Fixed
Details (2)
1:5.0.2-1+deb12u4· amd64 · bookwormFixed · Fixed:
1:5.0.2-1+deb12u4nvd · lxc · debian · bookworm; nvd · lxc · debian · 12
1:5.0.2-1+deb12u4· arm64 · bookwormFixed · Fixed:
1:5.0.2-1+deb12u4nvd · lxc · debian · bookworm; nvd · lxc · debian · 12
- [lxc-dev]Fixed
Source package: [lxc]
Details (2)
1:5.0.2-1+deb12u4· amd64 · bookwormFixed · Fixed:
1:5.0.2-1+deb12u4nvd · lxc · debian · bookworm; nvd · lxc · debian · 12
1:5.0.2-1+deb12u4· arm64 · bookwormFixed · Fixed:
1:5.0.2-1+deb12u4nvd · lxc · debian · bookworm; nvd · lxc · debian · 12
- [lxc-tests]Fixed
Source package: [lxc]
Details (2)
1:5.0.2-1+deb12u4· amd64 · bookwormFixed · Fixed:
1:5.0.2-1+deb12u4nvd · lxc · debian · bookworm; nvd · lxc · debian · 12
1:5.0.2-1+deb12u4· arm64 · bookwormFixed · Fixed:
1:5.0.2-1+deb12u4nvd · lxc · debian · bookworm; nvd · lxc · debian · 12
[Debian 13 (Trixie)]
- [liblxc1t64]Fixed
Source package: [lxc]
Details (2)
1:6.0.4-4+deb13u3+b1· amd64 · trixieFixed · Fixed:
1:6.0.4-4+deb13u3nvd · lxc · debian · 13
1:6.0.4-4+deb13u3+b1· arm64 · trixieFixed · Fixed:
1:6.0.4-4+deb13u3nvd · lxc · debian · 13
- [liblxc-common]Fixed
Source package: [lxc]
Details (2)
1:6.0.4-4+deb13u3+b1· amd64 · trixieFixed · Fixed:
1:6.0.4-4+deb13u3nvd · lxc · debian · 13
1:6.0.4-4+deb13u3+b1· arm64 · trixieFixed · Fixed:
1:6.0.4-4+deb13u3nvd · lxc · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11651-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-39402]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-39402]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-39402]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10678-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:11651-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-39402]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39402.json]
- [https://ubuntu.com/security/notices/USN-8826-1]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]