---
title: "CVE-2026-48754\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2026-48754?format=md
keywords: index, follow
---

# CVE-2026-48754

Publication date 21 August 2026

Last updated 2 September 2026

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

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## Description

Incus is a system container and virtual machine manager. Prior to version
7.1.0, `(\*backend).createDependentVolumesFromBackup` in
`internal/server/storage/backend.go` contains a cluster of unguarded
pointer derefs on every dependent-volume entry's `VolumeSnapshots[i]`,
`Volume`, and `Pool` sub-fields. An authenticated user with
`can\_create\_instances` permission on any project can crash the `incusd`
daemon by uploading an instance backup tarball whose `dependent\_volumes[\*]`
block contains a nil snapshot pointer (or omits `volume:` / `pool:`). This
is a sibling-field variant of the 2026-05-04 batch fix
`d768f81c0a1d985f35ae56219519822b080bf5e3` ("Properly check dependent
volumes on import"). That commit added `if disk == nil` at the top of the
outer loop, but did not guard the four sub-pointer fields the loop body
dereferences naked. Version 7.1.0 contains an updated patch.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| incus | 26.04 LTS resolute | Needs evaluation |
| 25.10 questing | Ignored end of life, was needs-triage |
| 24.04 LTS noble | Needs evaluation |
| 22.04 LTS jammy | Not in release |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v4.0

**Base score**

2.1 · Low

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Attack requirements | None |
  | Privileges required | Low |
  | User interaction | None |
  | Vulnerable system - Confidentiality impact | None |
  | Vulnerable system - Integrity impact | None |
  | Vulnerable system - Availability impact | Low |
  | Subsequent system - Confidentiality impact | None |
  | Subsequent system - Integrity impact | None |
  | Subsequent system - Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 2.1 · Low |
  | Base + Threat score | - |
  | Base + Environmental score | - |
  | Base + Threat + Environmental score | - |

**Vector:** CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-48754)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-48754)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-48754)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-48754)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-48754>
* <https://github.com/lxc/incus/pull/3425>
* <https://github.com/lxc/incus/security/advisories/GHSA-4xg6-52mh-fpw8>