RHSA-2026:65851 - Security Advisory

Topic

Red Hat OpenShift Container Platform release 4.18.55 is now available with
updates to packages and images that fix several bugs and add enhancements.

This release includes a security update for Red Hat OpenShift Container
Platform 4.18.

Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.

Description

Red Hat OpenShift Container Platform is Red Hat's cloud computing
Kubernetes application platform solution designed for on-premise or private
cloud deployments.

This advisory contains the container images for Red Hat OpenShift Container
Platform 4.18.55. See the following advisory for the RPM packages for this
release:

https://access.redhat.com/errata/RHSA-2026:66385

Space precludes documenting all of the container images in this advisory.
See the following Release Notes documentation, which will be updated
shortly for this release, for details about these changes:

https://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html/release_notes/

Security Fix(es):

• bind: BIND: Denial of Service via maliciously crafted DNSSEC-validated

zone (CVE-2026-1519)

• samba: group policy certificate enrollment uses http:// without

validation (CVE-2026-3012)

• bind: BIND 9 server memory exhaustion during GSS-API TKEY negotiation

(CVE-2026-3039)

• bind: BIND: Denial of Service via specially crafted DNS messages

(CVE-2026-5946)

• dracut: dracut: Root code execution via DHCP options command injection

(CVE-2026-6893)

• bind9: bind: Potential wildcard CNAME RPZ policy bypass (CVE-2026-11331)
• sqlite: SQLite: Arbitrary code execution via crafted FTS5 full-text

search data (CVE-2026-11822)

• sqlite: SQLite: Arbitrary code execution and crash via heap-based buffer

overflow in FTS5 (CVE-2026-11824)

• bind: bind9: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field

(CVE-2026-13321)

• dracut: dracut: root code execution via unescaped error message written

to sourced emergency hook script in die() (CVE-2026-15816)

• sg3_utils: sg3_utils: arbitrary command execution via udev property

injection in sg_inq --export (CVE-2026-16313)

• golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege

escalation via incorrect Punycode label processing (CVE-2026-39821)

• kernel: fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath

(CVE-2026-43112)

• samba: vfs_worm does not block directory modification (CVE-2026-2340)
• gnutls: GnuTLS: Policy bypass due to case-sensitive nameConstraints

comparison (CVE-2026-3833)

• bind: bind9: Incorrect acceptance of NSEC3 records (CVE-2026-10723)
• libarchive: Double-Free Vulnerability in RAR5 Decompression Logic via

dangling filtered_buf pointer in init_unpack() (CVE-2026-14164)

• systemd: systemd: Arbitrary code execution or Denial of Service via

spurious IPC API call data (CVE-2026-29111)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in the References section.

All OpenShift Container Platform 4.18 users are advised to upgrade to these
updated packages and images when they are available in the appropriate
release channel. To check for available updates, use the OpenShift CLI (oc)
or web console. Instructions for upgrading a cluster are available at
https://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html-single/updating_clusters/index#updating-cluster-cli.

Solution

For OpenShift Container Platform 4.18 see the following documentation,
which will be updated shortly for this release, for important instructions
on how to upgrade your cluster and fully apply this asynchronous errata
update:

https://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html/release_notes/

You may download the oc tool and use it to inspect release image metadata
for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests
may be found at
https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.

The sha values for the release are as follows:

(For x86_64 architecture)
The image digest is
sha256:77724a6074081531299a1f3136ade3f5491d252a5b502a4e26e82f2c65213b95

(For s390x architecture)
The image digest is
sha256:be975cbbdf062e07034927f71324a11d2df4321af174e7a6f655db0051e3e749

(For ppc64le architecture)
The image digest is
sha256:c9a14d5097f91a7d01e068a15f6899c53359a3a3e021d96bb68f11eb3e73072c

(For aarch64 architecture)
The image digest is
sha256:d4b9d6050c259b416b19a91f3a5b25c0dd48803c272991a723f1a32866da420a

All OpenShift Container Platform 4.18 users are advised to upgrade to these
updated packages and images when they are available in the appropriate
release channel. To check for available updates, use the OpenShift CLI (oc)
or web console. Instructions for upgrading a cluster are available at
https://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html-single/updating_clusters/index#updating-cluster-cli.

Affected Products

• Red Hat OpenShift Container Platform 4.18 for RHEL 9 x86_64
• Red Hat OpenShift Container Platform 4.18 for RHEL 8 x86_64
• Red Hat OpenShift Container Platform for Power 4.18 for RHEL 9 ppc64le
• Red Hat OpenShift Container Platform for Power 4.18 for RHEL 8 ppc64le
• Red Hat OpenShift Container Platform for IBM Z and LinuxONE 4.18 for RHEL 9 s390x
• Red Hat OpenShift Container Platform for IBM Z and LinuxONE 4.18 for RHEL 8 s390x
• Red Hat OpenShift Container Platform for ARM 64 4.18 for RHEL 9 aarch64
• Red Hat OpenShift Container Platform for ARM 64 4.18 for RHEL 8 aarch64

Fixes

• BZ - 2445763 - CVE-2026-3833 gnutls: GnuTLS: Policy bypass due to case-sensitive nameConstraints comparison
• BZ - 2447318 - CVE-2026-2340 samba: vfs_worm does not block directory modification
• BZ - 2447319 - CVE-2026-3012 samba: group policy certificate enrollment uses http:// without validation
• BZ - 2450505 - CVE-2026-29111 systemd: systemd: Arbitrary code execution or Denial of Service via spurious IPC API call data
• BZ - 2451305 - CVE-2026-1519 bind: BIND: Denial of Service via maliciously crafted DNSSEC-validated zone
• BZ - 2459963 - CVE-2026-6893 dracut: dracut: Root code execution via DHCP options command injection
• BZ - 2467015 - CVE-2026-43112 kernel: fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath
• BZ - 2479767 - CVE-2026-3039 bind: BIND 9 server memory exhaustion during GSS-API TKEY negotiation
• BZ - 2479771 - CVE-2026-5946 bind: BIND: Denial of Service via specially crafted DNS messages
• BZ - 2480756 - CVE-2026-39821 golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing
• BZ - 2487258 - CVE-2026-11822 sqlite: SQLite: Arbitrary code execution via crafted FTS5 full-text search data
• BZ - 2487269 - CVE-2026-11824 sqlite: SQLite: Arbitrary code execution and crash via heap-based buffer overflow in FTS5
• BZ - 2493411 - CVE-2026-14164 libarchive: Double-Free Vulnerability in RAR5 Decompression Logic via dangling filtered_buf pointer in init_unpack()
• BZ - 2500889 - CVE-2026-15816 dracut: dracut: root code execution via unescaped error message written to sourced emergency hook script in die()
• BZ - 2502845 - CVE-2026-16313 sg3_utils: sg3_utils: arbitrary command execution via udev property injection in sg_inq --export
• BZ - 2503721 - CVE-2026-11331 bind9: bind: Potential wildcard CNAME RPZ policy bypass
• BZ - 2504166 - CVE-2026-13321 bind: bind9: DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field
• BZ - 2504560 - CVE-2026-10723 bind: bind9: Incorrect acceptance of NSEC3 records
• OCPBUGS-66128 - [4.18] RHCOS SNO does not boot after install; wrong device uuid in GRUB
• OCPBUGS-77052 - [4.18] Bootimage bump tracker

CVEs

• CVE-2026-1519
• CVE-2026-2340
• CVE-2026-3012
• CVE-2026-3039
• CVE-2026-3833
• CVE-2026-5946
• CVE-2026-6893
• CVE-2026-10723
• CVE-2026-11331
• CVE-2026-11822
• CVE-2026-11824
• CVE-2026-13321
• CVE-2026-14164
• CVE-2026-15816
• CVE-2026-16313
• CVE-2026-29111
• CVE-2026-39821
• CVE-2026-43112

References

• https://access.redhat.com/security/updates/classification/#important