Incus: Nil-pointer dereference in createDependentVolumesFromBackup on disk.{Volume,VolumeSnapshots,Pool}

{
  "id": "5384d431fe4e60bfdd177cadda9322bff427b5886ac6cfffffc3f435d589d600",
  "url": "https://osv.dev/vulnerability/CVE-2026-48754",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Incus: Nil-pointer dereference in createDependentVolumesFromBackup on disk.{Volume,VolumeSnapshots,Pool}",
    "summary": "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.",
    "evidence": "osv:CVE-2026-48754",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2026-48754",
      "aliases": [
        "CVE-2026-48754",
        "GHSA-4xg6-52mh-fpw8",
        "GO-2026-5800"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/lxc/incus",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "42da2b16a4c8ed23f7b3bc50d7736d795f9a963a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "7.1.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "7.1.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v7.0.0",
            "v6.23.0",
            "v6.22.0",
            "v6.21.0",
            "v6.20.0",
            "v6.19.1",
            "v6.19.0",
            "v6.18.0",
            "v6.17.0",
            "v6.16.0",
            "v6.14.0",
            "v6.15.0",
            "v6.13.0",
            "v6.12.0",
            "v6.11.0",
            "v6.10.1",
            "v6.10.0",
            "v6.9.0",
            "v6.8.0",
            "v6.7.0",
            "v6.6.0",
            "v6.5.0",
            "v6.4.0",
            "v6.3.0",
            "v6.2.0",
            "v6.0.0",
            "v6.1.0",
            "v0.7.0",
            "v0.6.0",
            "v0.5.1",
            "v0.5.0",
            "v0.4.0",
            "v0.3.0",
            "v0.2.0",
            "v0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48754.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.827632972Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48754.json",
        "https://github.com/lxc/incus/security/advisories/GHSA-4xg6-52mh-fpw8",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-48754"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-476"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48754.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-48754",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519350,
  "published_at": "2026-08-21T14:36:16.011+00:00"
}