2.1

CVE-2026-48754: lxc incus NULL Pointer Dereference

CVSS: 2.1v4.0LowDeferred
AliasesUBUNTU-CVE-2026-48754DEBIAN-CVE-2026-48754GHSA-4xg6-52mh-fpw8
Published 21-08-2026Last modified 26-08-2026
Open JSON

Vulnerability summary

CVE-2026-48754 is a low (CVSS 2.1) NULL Pointer Dereference vulnerability in lxc incus. EPSS estimates a 0.38% chance of exploitation in the next 30 days, higher than 30.7% of scored vulnerabilities.

Overall risk
8/100
0100
Minimal · default modelHow is this calculated?
CVSS score
2.1/10
010
Low · v4.0 (CVE.org)
EPSS score
0.38%
0%100%
Low · +0.10 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
OPENSUSE-SU-2026:11651-1OPENSUSE-SU-2026:21483-1

Timeline

  1. 21-08-2026
    PublishedVulnerability first disclosed.
  2. 26-08-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.38%

Chance of exploitation in the next 30 days

Percentile

31%

Versus all other CVEs

30-day change

+0.10 pp

From 0.28% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.38%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Github.com/lxc/incus2 products
  • v6All versions (No fix recorded)
  • v7< 7.1.0
Debian1 product
  • incus< 7.0.0-2
Github.com/lxc1 product
  • incusAll versions (No fix recorded)
Github.com/lxc/incus/v7/cmd1 product
  • incusd< 7.1.0
Lxc1 product
Ubuntu1 product
  • incusAll versions (No fix recorded)

6 vendors · 7 products

References

6 links