CVE-2026-16460 (GCVE-0-2026-16460)

Vulnerability from cvelistv5 – Published: 2026-10-19 06:40 – Updated: 2026-10-21 18:56
VLAI
Title
Bootc: ostree: bootc/ostree: staged deployments not revalidated against container signature policy before finalization
Summary
A flaw was found in bootc and ostree. Already-staged deployments are finalized without revalidating the deployment's container image against the current containers signature policy. Unsigned OS content staged under a prior permissive policy can remain bootable after policy is hardened to reject unsigned images, leading to full host compromise on reboot.
Severity
7.4 (High)
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-19 17:30 UTC
CWE
  • CWE-345 - Insufficient Verification of Data Authenticity
Assigner
redhat CNA under the redhat root
CNA scorecard B 82/100 over 1055 records in the last 180 days details
References
URL Tags
https://access.redhat.com/security/cve/CVE-2026-16460 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2503167 issue-trackingx_refsource_REDHAT
Impacted products
Date Public
2026-10-18 00:00
Credits
Red Hat would like to thank Christopher Lusk (North Echo Security Research) for reporting this issue.
Show details on NVD website
To clipboard 

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            }
          ],
          "credits": [
            {
              "lang": "en",
              "value": "Red Hat would like to thank Christopher Lusk (North Echo Security Research) for reporting this issue."
            }
          ],
          "datePublic": "2026-10-18T00:00:00.000Z",
          "descriptions": [
            {
              "lang": "en",
              "value": "A flaw was found in bootc and ostree. Already-staged deployments are finalized without revalidating the deployment\u0027s container image against the current containers signature policy. Unsigned OS content staged under a prior permissive policy can remain bootable after policy is hardened to reject unsigned images, leading to full host compromise on reboot."
            }
          ],
          "metrics": [
            {
              "other": {
                "content": {
                  "namespace": "https://access.redhat.com/security/updates/classification/",
                  "value": "Important"
                },
                "type": "Red Hat severity rating"
              }
            },
            {
              "cvssV3_1": {
                "attackComplexity": "HIGH",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.4,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "format": "CVSS"
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-345",
                  "description": "Insufficient Verification of Data Authenticity",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-10-21T18:56:55.605Z",
            "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
            "shortName": "redhat"
          },
          "references": [
            {
              "tags": [
                "vdb-entry",
                "x_refsource_REDHAT"
              ],
              "url": "https://access.redhat.com/security/cve/CVE-2026-16460"
            },
            {
              "name": "RHBZ#2503167",
              "tags": [
                "issue-tracking",
                "x_refsource_REDHAT"
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              "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2503167"
            }
          ],
          "timeline": [
            {
              "lang": "en",
              "time": "2026-07-21T11:36:56.492Z",
              "value": "Reported to Red Hat."
            },
            {
              "lang": "en",
              "time": "2026-10-18T00:00:00.000Z",
              "value": "Made public."
            }
          ],
          "title": "Bootc: ostree: bootc/ostree: staged deployments not revalidated against container signature policy before finalization",
          "workarounds": [
            {
              "lang": "en",
              "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.\n\n--- CME Mitigation Guidance (2026-10-20) ---\nDisclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure.\n\nThe highest-value action is to revalidate container image signatures against active container signature policy before finalizing or booting staged ostree deployments in bootc and ostree: upgrade to the fixed Bootc/Ostree/Rpm Ostree/Rust Zincati builds, which revalidates container image signatures against the active container signature policy in /etc/containers/policy.json before finalizing or booting already-staged ostree deployments, closing all 2 injection vectors (host reboot into pending staged deployment, bootc upgrade --from-downloaded deployment application). Until patched, this is only a concern on Linux systems using bootc or ostree, including RHEL image-mode hosts \u2014 Non-Linux platforms are unaffected \u2014 so Clear all existing staged ostree deployments immediately after hardening /etc/containers/policy.json and ensure unsigned container images are never staged. As a compensating measure, Run SELinux in enforcing mode to confine processes running from finalized deployments to defined domains and Deploy IMA/EVM appraisal to verify executable file signatures at runtime and block untrusted binaries. These controls limit blast radius and contain exploitation, but they do not fix the underlying missing signature revalidation defect \u2014 apply the upstream patch to fully remediate.\n\nHighest-impact CME: CME-712 Container Image Signing and Provenance Verification (Cosign/Sigstore) (high)"
            }
          ],
          "x_generator": {
            "engine": "cvelib 1.8.0"
          },
          "x_redhatCweChain": "CWE-345: Insufficient Verification of Data Authenticity"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "assignerShortName": "redhat",
        "cveId": "CVE-2026-16460",
        "datePublished": "2026-10-19T06:40:50.466Z",
        "dateReserved": "2026-07-21T11:26:43.156Z",
        "dateUpdated": "2026-10-21T18:56:55.605Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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