CVE-2026-33542

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{"bugzilla": {"description": "github.com/lxc/incus: Incus: Image cache poisoning due to insufficient image fingerprint validation", "id": "2452019", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2452019"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-354", "details": ["A flaw was found in Incus, a system container and virtual machine manager. A remote attacker could exploit a lack of validation of image fingerprints when downloading from simplestreams image servers. This vulnerability, under specific conditions, could lead to image cache poisoning, allowing an attacker to expose other tenants to running their controlled images instead of the expected ones."], "name": "CVE-2026-33542", "public_date": "2026-03-26T22:32:13Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-33542\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-33542\nhttps://github.com/lxc/incus/security/advisories/GHSA-p8mm-23gg-jc9r"], "statement": "This Important vulnerability in Incus, a system container and virtual machine manager, stems from insufficient image fingerprint validation during downloads from simplestreams image servers. Under specific conditions, this could lead to image cache poisoning, allowing an attacker to expose other tenants to running controlled images. This issue primarily affects community projects such as Fedora.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.23.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "incus", "source": "cna", "vendor": "lxc"}, "product": "incus", "vendor": "lxc"}], "analysis": {"en": {"generated_at": "2026-03-30T21:07:29.893655+00:00", "value": {"mitigation_remediation": ["Update Incus to version 6.23.0 or later, which validates image fingerprints during download.", "If an upgrade is delayed, restrict image sources to known, trusted simplestreams servers by configuring appropriate access controls.", "Manually verify image fingerprints against published checksums before caching when using external image repositories.", "Monitor image download logs for anomalies or failures in fingerprint verification.", "If a compromised image has been cached, delete it from the local cache and rebuild affected containers from a verified source."], "summary": {"action": "Apply Patch", "impact": "Privilege Escalation via Malicious Container Image"}, "threat_synthesis": {"affected_systems": "The issue affects Incus versions earlier than 6.23.0 from the Linux Containers project. Users running these versions are susceptible to the described image cache poisoning risk.", "description_and_impact": "Incus, a system container and virtual machine manager, fails to validate the combined fingerprint of images downloaded from simplestreams servers before storing them in its local cache. This omission allows an attacker to perform image cache poisoning, such that a malicious image is cached under the expectation of a legitimate one. If a victim tenant subsequently runs the corrupted image, the attacker can execute arbitrary code within the tenant, potentially escalating privileges to the host. The vulnerability stems from a lack of cryptographic verification (CWE\u2011295) and improper handling of trust boundaries (CWE\u2011354).", "risk_and_exploitability": "The CVSS score of 5.7 indicates a moderate severity, while the EPSS score of less than 1% suggests a low current exploitation likelihood. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. Attackers would need to infiltrate or trick the development of a simplestreams image server or otherwise supply a malicious image via the network, leading to potential compromise when tenants consume the poisoned artifact."}}}}, "created": "2026-03-27T08:31:31.073234+00:00", "updated": "2026-03-31T20:01:26.148823+00:00", "vendors": ["lxc", "lxc$PRODUCT$incus"]}