| Name | CVE-2026-9640 |
| Description | A privilege escalation vulnerability exists in LXD from 6.0 before 6.9, 5.21.0 before 5.21.5, and 5.0.0 before 5.0.7 regarding the handling of project-restriction policies during snapshot restoration.. An authenticated project operator in a restricted multi-tenant environment can bypass policy restrictions by importing a maliciously crafted instance backup containing restricted configuration keys within a snapshot. When the snapshot is restored, these restricted keys are applied to the live instance without policy validation. Starting the modified instance grants the operator unauthorized host root access. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-6373-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| lxd (PTS) | bookworm, bookworm (security) | 5.0.2-5+deb12u6 | vulnerable |
| trixie | 5.0.2+git20231211.1364ae4-9+deb13u6 | vulnerable |
| trixie (security) | 5.0.2+git20231211.1364ae4-9+deb13u7 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| lxd | source | trixie | 5.0.2+git20231211.1364ae4-9+deb13u7 | DSA-6373-1 |
| lxd | source | (unstable) | (unfixed) |
Notes
https://github.com/canonical/lxd/security/advisories/GHSA-ppq7-4492-5552
https://github.com/canonical/lxd/pull/18301
https://github.com/canonical/lxd/pull/18303
https://github.com/canonical/lxd/pull/18304
