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Fencer Vulns
high 7.4

CVE-2026-16460 json

Bootc: ostree: bootc/ostree: staged deployments not revalidated against container signature policy before finalization

published 2026-10-19 21 d ago modified 2026-11-04 4 d ago also EUVD-2026-104093

cvss
7.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 0%
public exploits
0
none known

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.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-16460 updated cvss 7.4

bootc: ostree: bootc/ostree: staged deployments not revalidated against container signature policy before finalization

  • Red Hat Hardened Images bootc, ostree
    affected: workaround, no fix available
  • Red Hat Enterprise Linux 8 ostree, ostree-libs, ostree-grub2 Red Hat Enterprise Linux 9 bootc, ostree, rpm-ostree, ostree-libs, ostree-grub2, rpm-ostree-libs, +1 more Red Hat Enterprise Linux 10 bootc, ostree, rpm-ostree
    not affected: vulnerable code cannot be controlled by adversary
  • Red Hat OpenShift Container Platform 4 ostree, ostree-libs, ostree-grub2, openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 ostree, openshift/ose-rhel-coreos-9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
20 d ago

Exploit prediction

0.10% chance of exploitation in the next 30 days, higher than 0% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.4 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat OpenShift Container Platform 4
  • Red Hat Red Hat OpenShift Container Platform 5

Classification

Weakness
  • CWE-345 Insufficient Verification of Data Authenticity

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.