Vulnerability · Published Aug 21, 2026 · Assigned by GitHub_M
CVE-2026-47753Incus has a Nil-Pointer Dereference Panic via Instance Backup Import (volume omitted)
Medium 4.4
In plain English
A medium-severity null pointer dereference in incus from lxc. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Incus is a system container and virtual machine manager. Prior to version 7.1.0, `(*backend).CreateInstanceFromBackup` in `internal/server/storage/backend.go` contains a nil-pointer dereference that an authenticated user with permission to create instances in any project can trigger remotely by uploading a crafted backup tarball. The Incus daemon panics and the process crashes, causing denial of service to every project on that cluster member. This is a sibling of `GHSA-fwj8-62r8-8p8m`, `GHSA-r7w7-mmxr-47r9`, and `GHSA-x5r6-jr56-89pv` (all assigned 2026-05-04). Those patches added guards on adjacent fields of the same `backup/config.Config` struct; the `Volume` field on the instance-import path was missed. Version 7.1.0 contains an updated patch.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | incus | 7.0.1-r0 | ALPINE-CVE-2026-47753 |
| Debian:14 | incus | 7.0.0-2 | DEBIAN-CVE-2026-47753 |
| Go | github.com/lxc/incus | no fix listed | GO-2026-5252 |
| Go | github.com/lxc/incus/v6 | no fix listed | GO-2026-5252 |
| Go | github.com/lxc/incus/v7 | 7.1.0 | GO-2026-5252 |
| Go | github.com/lxc/incus/v7 | 7.1.0 | GHSA-8g7m-96c8-8wwc |
| Ubuntu:25.10 | incus | no fix listed | UBUNTU-CVE-2026-47753 |
| Ubuntu:26.10 | incus | no fix listed | UBUNTU-CVE-2026-47753 |
Affected products (as reported)
Weakness: CWE-476 · Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
References
- https://github.com/lxc/incus/security/advisories/GHSA-8g7m-96c8-8wwc x_refsource_CONFIRM
- https://github.com/lxc/incus/commit/98e64f0a6fcfdc9676eea0246418d490c53297bf x_refsource_MISC