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bdu:2026-15476

EUVD-2026-357330

fkie_cve-2026-47753

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.

GHSA-8g7m-96c8-8wwc — Incus has a Nil-Pointer Dereference Panic via Instance Backup Import (volume omitted)

Affected: Go: github.com/lxc/incus/v7

## Summary

`(*backend).CreateInstanceFromBackup` in [`internal/server/storage/backend.go`](https://github.com/lxc/incus/blob/1513600/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.

## Vulnerable code

[`internal/server/storage/backend.go`](https://github.com/lxc/incus/blob/1513600/internal/server/storage/backend.go) (current `main`, commit `1513600`):

```go // Lines 763-767 — properly guarded: var volumeConfig map[string]string if srcBackup.Config != nil && srcBackup.Config.Volume != nil { volumeConfig = srcBackup.Config.Volume.Config }

// ... a few lines later ...

// Line 795 — unguarded, dereferences Config.Volume directly: if srcBackup.Config.Volume.Config["block.type"] == drivers.BlockVolumeTypeQcow2 { ```

The caller `createFromBackup` in [`cmd/incusd/instances_post.go`](https://github.com/lxc/incus/blob/1513600/cmd/incusd/instances_post.go) only verifies that `Config` and `Config.Container` are non-nil:

```go // instances_p…

openSUSE-SU-2026:11651-1 — incus-7.4-1.1 on GA media

incus-7.4-1.1 on GA media

UBUNTU-CVE-2026-47753

Affected: Ubuntu:Pro:24.04:LTS: incus, Ubuntu:25.10: incus, Ubuntu:Pro:26.04:LTS: incus