CVE-2026-39402: lxc is a Linux container runtime

Q: How do I fix CVE-2026-39402?

lxc: upgrade to 7.0.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-39402 being exploited?

CVE-2026-39402 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-2026-39402 affect?

CVE-2026-39402 affects lxc. Severity is medium (CVSS 6.5). 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

Q: How urgent is CVE-2026-39402?

Priority 34/100. Public exploit reference; On your watchlist

Routine

MEDIUM 6.5WATCHLISTUPGRADE

CVE-2026-39402 is a medium-severity flaw (CVSS 6.5) affecting lxc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 fie

Why this priority

Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-863
Published	2026-05-05
Last modified	2026-07-24

Publisher (CNA): GitHub, Inc. · Vendor: linuxcontainers

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-05 21:16 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

linuxcontainers lxc UPGRADE

Affected: < 7.0.0

Fixed in: 7.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 7.0.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade lxc

Note

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

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-2026-39402?

lxc: upgrade to 7.0.0. Exact commands for each OS are on this page.

Is CVE-2026-39402 being exploited?

CVE-2026-39402 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-2026-39402 affect?

CVE-2026-39402 affects lxc. Severity is medium (CVSS 6.5). 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

How urgent is CVE-2026-39402?

Priority 34/100. Public exploit reference; On your watchlist

References

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