CVE-2022-3094 — An UPDATE message flood may cause named to exhaust all available memory

Description

Sending a flood of dynamic DNS updates may cause `named` to allocate large amounts of memory. This, in turn, may cause `named` to exit due to a lack of free memory. We are not aware of any cases where this has been exploited.

Memory is allocated prior to the checking of access permissions (ACLs) and is retained during the processing of a dynamic update from a client whose access credentials are accepted. Memory allocated to clients that are not permitted to send updates is released immediately upon rejection. The scope of this vulnerability is limited therefore to trusted clients who are permitted to make dynamic zone changes.

If a dynamic update is REFUSED, memory will be released again very quickly. Therefore it is only likely to be possible to degrade or stop `named` by sending a flood of unaccepted dynamic updates comparable in magnitude to a query flood intended to achieve the same detrimental outcome.

BIND 9.11 and earlier branches are also affected, but through exhaustion of internal resources rather than memory constraints. This may reduce performance but should not be a significant problem for most servers. Therefore we don't intend to address this for BIND versions prior to BIND 9.16.
This issue affects BIND 9 versions 9.16.0 through 9.16.36, 9.18.0 through 9.18.10, 9.19.0 through 9.19.8, and 9.16.8-S1 through 9.16.36-S1.

Affected products

Vendor	Product	Affected	Fixed
ISC	BIND 9	9.16.0 – ≤ 9.16.36, 9.18.0 – ≤ 9.18.10, 9.19.0 – ≤ 9.19.8, 9.16.8-S1 – ≤ 9.16.36-S1	—

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗

Release	Package	Fixed in	Advisory
Debian 14	bind9	1:9.18.11-1	—
Debian 13	bind9	1:9.18.11-1	—
Debian 12	bind9	1:9.18.11-1	—
Debian 11	bind9	1:9.16.37-1~deb11u1	DSA-5329-1

Ubuntu

Security tracker ↗

Release	Package	Fixed in	Advisory
Ubuntu 22.04 LTS	bind9	1:9.18.1-1ubuntu1.3	USN-5827-1
Ubuntu 20.04 LTS	bind9	1:9.16.1-0ubuntu2.12	USN-5827-1

Red Hat

Security tracker ↗

Release	Package	Fixed in	Advisory
RHEL 9	bind +9	32:9.16.23-11.el9	RHSA-2023:2261
RHEL 8	bind +16	32:9.11.36-11.el8_9	RHSA-2023:7177
RHEL 8	bind9.16 +8	32:9.16.23-0.14.el8	RHSA-2023:2792

Show 2 more (older releases, extended support, other products)

Release	Package	Fixed in	Advisory
RHEL 8.8 EUS	bind +16	32:9.11.36-8.el8_8.3	RHSA-2024:1406
RHEL 8.6 EUS	bind +16	32:9.11.36-3.el8_6.7	RHSA-2024:2720
RHEL 8.6 EUS	dhcp +5	12:4.3.6-47.el8_6.2	RHSA-2024:2720

AlmaLinux

Errata ↗

Release	Package	Fixed in	Advisory
AlmaLinux 9	bind +9	32:9.16.23-11.el9	ALSA-2023:2261
AlmaLinux 8	bind +16	32:9.11.36-11.el8_9	ALSA-2023:7177
AlmaLinux 8	bind9.16 +8	32:9.16.23-0.14.el8	ALSA-2023:2792

SUSE

Security tracker ↗

Release	Package	Fixed in	Advisory
SLES 15 SP4	bind	9.16.6-150300.22.27.1	SUSE-SU-2023:0427-1, SUSE-SU-2023:0341-1
SLES 15 SP3	bind	9.16.6-150300.22.27.1	SUSE-SU-2023:0427-1

Show 9 more (older releases, extended support, other products)

Release	Package	Fixed in	Advisory
SLES for SAP 15 SP3	bind	9.16.6-150300.22.27.1	SUSE-SU-2023:0427-1
SLE Real Time 15 SP3	bind	9.16.6-150300.22.27.1	SUSE-SU-2023:0427-1
SLE HPC 15 SP3	bind	9.16.6-150300.22.27.1	SUSE-SU-2023:0427-1
SUSE Multi Linux Manager Tools SLE-Micro-5	bind	9.16.6-150000.12.91.1	SUSE-SU-2026:3517-1
SUSE Manager Server 4.2	bind	9.16.6-150300.22.27.1	SUSE-SU-2023:0427-1
SUSE Manager Retail Branch Server 4.2	bind	9.16.6-150300.22.27.1	SUSE-SU-2023:0427-1
SUSE Manager Proxy 4.2	bind	9.16.6-150300.22.27.1	SUSE-SU-2023:0427-1
SUSE Manager Client Tools for SLE Micro 5	bind	9.16.6-150000.12.91.1	SUSE-SU-2026:3517-1
SUSE Enterprise Storage 7.1	bind	9.16.6-150300.22.27.1	SUSE-SU-2023:0427-1

openSUSE

Security tracker ↗

Release	Package	Fixed in	Advisory
openSUSE Tumbleweed	bind	9.18.11-1.1	openSUSE-SU-2024:12641-1
openSUSE Leap 15.4	bind	9.16.6-150300.22.27.1	SUSE-SU-2023:0427-1, SUSE-SU-2023:0341-1

Alpine

Security tracker ↗

Release	Package	Fixed in	Advisory
Alpine v3.24	bind	9.18.11-r0	—
Alpine v3.23	bind	9.18.11-r0	—
Alpine v3.22	bind	9.18.11-r0	—
Alpine v3.21	bind	9.18.11-r0	—
Alpine v3.20	bind	9.18.11-r0	—

Show 6 more (older releases, extended support, other products)

Release	Package	Fixed in	Advisory
Alpine v3.19	bind	9.18.11-r0	—
Alpine v3.18	bind	9.18.11-r0	—
Alpine v3.17	bind	9.18.11-r0	—
Alpine v3.16	bind	9.16.37-r0	—
Alpine v3.15	bind	9.16.37-r0	—
Alpine v3.14	bind	9.16.37-r0	—

Amazon Linux

Release	Package	Fixed in	Advisory
Amazon Linux 2023	bind +16	32:9.16.38-1.amzn2023	ALAS2023-2023-161
Amazon Linux 2	bind +15	32:9.11.4-26.P2.amzn2.13.9	ALAS2-2025-2729

Azure Linux

Release	Package	Fixed in	Advisory
Azure Linux 2 (CBL-Mariner)	bind	9.16.37-2	—

Oracle Linux

Release	Package	Fixed in	Advisory
Oracle Linux 9	bind +9	32:9.16.23-11.el9	ELSA-2023-2261
Oracle Linux 8	bind +16	32:9.11.36-11.el8_9	ELSA-2023-7177
Oracle Linux 8	bind9.16 +8	32:9.16.23-0.14.el8	ELSA-2023-2792

Wolfi

Release	Package	Fixed in	Advisory
Wolfi rolling	bind	9.18.11-r0	—

Advisories 25

ALSA-2023:2261 Moderate: bind security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
ALSA-2023:7177 Moderate: bind security update AlmaLinux Security Advisories · Oct 29, 2026
ALSA-2023:2792 Moderate: bind9.16 security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
RHSA-2024:2720 Red Hat Security Advisory: bind and dhcp security update Red Hat Security Advisories (RHSA) · Sep 2, 2026
RHSA-2023:2792 Red Hat Security Advisory: bind9.16 security and bug fix update Red Hat Security Advisories (RHSA) · Sep 2, 2026
RHSA-2023:2261 Red Hat Security Advisory: bind security and bug fix update Red Hat Security Advisories (RHSA) · Sep 2, 2026
SUSE-SU-2026:3517-1 Security update for bind SUSE / openSUSE Security Updates · Aug 7, 2026
WID-SEC-2023-0207 Internet Systems Consortium BIND: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Aug 6, 2026
RHSA-2023:7177 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
RHSA-2024:1406 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
WID-SEC-2024-1226 Red Hat OpenShift: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 11, 2026
USN-5827-1 bind9 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
DSA-5329-1 bind9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
SUSE-SU-2023:0341-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
SUSE-SU-2023:0427-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
openSUSE-SU-2024:12641-1 bind-9.18.11-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
WID-SEC-2023-1542 Red Hat OpenShift: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 18, 2025
WID-SEC-2023-1424 Xerox FreeFlow Print Server für Solaris: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 6, 2025
WID-SEC-2024-1307 Red Hat OpenShift Service Mesh Containers: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 5, 2025
ALAS2-2025-2729 Moderate: bind security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 9, 2025
WID-SEC-2024-2100 IBM Power Hardware Management Console: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 10, 2024
ELSA-2023-7177 Moderate: bind security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 17, 2023
ELSA-2023-2792 Moderate: bind9.16 security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 24, 2023
ELSA-2023-2261 Moderate: bind security and bug fix update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · May 15, 2023
ALAS2023-2023-161 Important: bind security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Apr 19, 2023

References

CVE-2022-3094 vendor-advisory