Description
Every `named` instance configured to run as a recursive resolver maintains a cache database holding the responses to the queries it has recently sent to authoritative servers. The size limit for that cache database can be configured using the `max-cache-size` statement in the configuration file; it defaults to 90% of the total amount of memory available on the host. When the size of the cache reaches 7/8 of the configured limit, a cache-cleaning algorithm starts to remove expired and/or least-recently used RRsets from the cache, to keep memory use below the configured limit.
It has been discovered that the effectiveness of the cache-cleaning algorithm used in `named` can be severely diminished by querying the resolver for specific RRsets in a certain order, effectively allowing the configured `max-cache-size` limit to be significantly exceeded.
This issue affects BIND 9 versions 9.11.0 through 9.16.41, 9.18.0 through 9.18.15, 9.19.0 through 9.19.13, 9.11.3-S1 through 9.16.41-S1, and 9.18.11-S1 through 9.18.15-S1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ISC | BIND 9 | 9.11.0 – ≤ 9.16.41, 9.18.0 – ≤ 9.18.15, 9.19.0 – ≤ 9.19.13, 9.11.3-S1 – ≤ 9.16.41-S1, 9.18.11-S1 – ≤ 9.18.15-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 | 1:9.18.16-1 | — |
| Debian 13 | bind9 | 1:9.18.16-1 | — |
| Debian 12 | bind9 | 1:9.18.16-1~deb12u1 | DSA-5439-1 |
| Debian 11 | bind9 | 1:9.16.42-1~deb11u1 | DSA-5439-1 |
| Debian 10 | bind9 | 1:9.11.5.P4+dfsg-5.1+deb10u9 | DLA-3498-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | isc-dhcp | No fix yet | — |
| Ubuntu 25.10 | isc-dhcp | No fix yet | — |
| Ubuntu 24.04 LTS | isc-dhcp | No fix yet | — |
| Ubuntu 22.04 LTS | bind9 | 1:9.18.12-0ubuntu0.22.04.2 | USN-6183-1 |
| Ubuntu 22.04 LTS | bind9-libs | No fix yet | — |
| Ubuntu 20.04 LTS | bind9 | 1:9.16.1-0ubuntu2.15 | USN-6183-1 |
| Ubuntu 20.04 LTS | bind9-libs | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | bind9 | 1:9.11.3+dfsg-1ubuntu1.19+esm1 | USN-6183-2 |
| Ubuntu Pro 16.04 LTS | bind9 | 1:9.10.3.dfsg.P4-8ubuntu1.19+esm6 | USN-6183-2 |
| Ubuntu Pro 14.04 LTS | bind9 | 1:9.9.5.dfsg-3ubuntu0.19+esm10 | USN-6183-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | bind +9 | 32:9.16.23-11.el9_2.1 | RHSA-2023:4099 |
| RHEL 8 | bind +16 | 32:9.11.36-8.el8_8.1 | RHSA-2023:4102 |
| RHEL 8 | bind9.16 +8 | 32:9.16.23-0.14.el8_8.1 | RHSA-2023:4100 |
| RHEL 7 | bind +15 | 32:9.11.4-26.P2.el7_9.14 | RHSA-2023:4152 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.0 EUS | bind +8 | 32:9.16.23-1.el9_0.2 | RHSA-2023:4005 |
| RHEL 8.6 EUS | bind +16 | 32:9.11.36-3.el8_6.4 | RHSA-2023:4101 |
| RHEL 8.6 EUS | bind9.16 +8 | 32:9.16.23-0.7.el8_6.2 | RHSA-2023:4037 |
| RHEL 8.4 TUS | bind +16 | 32:9.11.26-4.el8_4.2 | RHSA-2023:4332 |
| RHEL 8.4 E4S | bind +16 | 32:9.11.26-4.el8_4.2 | RHSA-2023:4332 |
| RHEL 8.4 AUS | bind +16 | 32:9.11.26-4.el8_4.2 | RHSA-2023:4332 |
| RHEL 8.2 TUS | bind +16 | 32:9.11.13-6.el8_2.5 | RHSA-2023:4153 |
| RHEL 8.2 E4S | bind +16 | 32:9.11.13-6.el8_2.5 | RHSA-2023:4153 |
| RHEL 8.2 AUS | bind +16 | 32:9.11.13-6.el8_2.5 | RHSA-2023:4153 |
| RHEL 8.1 E4S | bind +16 | 32:9.11.4-26.P2.el8_1.7 | RHSA-2023:4154 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | bind +9 | 32:9.16.23-11.el9_2.1 | ALSA-2023:4099 |
| AlmaLinux 8 | bind +16 | 32:9.11.36-8.el8_8.1 | ALSA-2023:4102 |
| AlmaLinux 8 | bind9.16 +8 | 32:9.16.23-0.14.el8_8.1.alma | ALSA-2023:4100 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | bind | 2:9.16.23-11.el9_2.1 | RLSA-2023:4099 |
| Rocky Linux 8 | bind | 2:9.11.36-8.el8_8.1 | RLSA-2023:4102 |
| Rocky Linux 8 | bind9.16 | 2:9.16.23-0.14.el8_8.1 | RLSA-2023:4100 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | bind | 9.16.6-150300.22.30.1 | SUSE-SU-2023:2954-1, SUSE-SU-2023:2836-1 |
| SLES 15 SP4 | bind | 9.16.6-150300.22.30.1 | SUSE-SU-2023:2954-1, SUSE-SU-2023:2667-1 |
| SLES 15 SP3 | bind | 9.16.6-150300.22.30.1 | SUSE-SU-2023:2954-1 |
| SLES 15 SP2 | bind | 9.16.6-150000.12.68.1 | SUSE-SU-2023:2794-1 |
| SLES 15 SP1 | bind | 9.16.6-150000.12.68.1 | SUSE-SU-2023:2794-1 |
Show 19 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | bind | 9.11.22-3.46.4 | SUSE-SU-2023:2793-1 |
| SLES 12 SP4 | bind | 9.11.22-3.46.4 | SUSE-SU-2023:2793-1 |
| SLES 12 SP2 | bind | 9.9.9P1-63.40.1 | SUSE-SU-2023:2789-1 |
| SLES for SAP 15 SP3 | bind | 9.16.6-150300.22.30.1 | SUSE-SU-2023:2954-1 |
| SLES for SAP 15 SP2 | bind | 9.16.6-150000.12.68.1 | SUSE-SU-2023:2794-1 |
| SLES for SAP 15 SP1 | bind | 9.16.6-150000.12.68.1 | SUSE-SU-2023:2794-1 |
| SLES for SAP 12 SP5 | bind | 9.11.22-3.46.4 | SUSE-SU-2023:2793-1 |
| SLES for SAP 12 SP4 | bind | 9.11.22-3.46.4 | SUSE-SU-2023:2793-1 |
| SLE Real Time 15 SP3 | bind | 9.16.6-150300.22.30.1 | SUSE-SU-2023:2954-1 |
| SLE HPC 15 SP3 | bind | 9.16.6-150300.22.30.1 | SUSE-SU-2023:2954-1 |
| SLE HPC 15 SP2 | bind | 9.16.6-150000.12.68.1 | SUSE-SU-2023:2794-1 |
| SLE HPC 15 SP1 | bind | 9.16.6-150000.12.68.1 | SUSE-SU-2023:2794-1 |
| SUSE OpenStack Cloud Crowbar 9 | bind | 9.11.22-3.46.4 | SUSE-SU-2023:2793-1 |
| SUSE OpenStack Cloud 9 | bind | 9.11.22-3.46.4 | SUSE-SU-2023:2793-1 |
| SUSE Manager Server 4.2 | bind | 9.16.6-150300.22.30.1 | SUSE-SU-2023:2954-1 |
| SUSE Manager Proxy 4.2 | bind | 9.16.6-150300.22.30.1 | SUSE-SU-2023:2954-1 |
| SUSE Manager Client Tools for SLE Micro 5 | bind | 9.16.6-150000.12.68.1 | SUSE-SU-2023:2794-1 |
| SUSE Enterprise Storage 7.1 | bind | 9.16.6-150300.22.30.1 | SUSE-SU-2023:2954-1 |
| SUSE Enterprise Storage 7 | bind | 9.16.6-150000.12.68.1 | SUSE-SU-2023:2794-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | bind | 9.18.16-1.1 | openSUSE-SU-2024:13015-1 |
| openSUSE Leap 15.5 | bind | 9.16.42-150500.8.3.1 | SUSE-SU-2023:2836-1 |
| openSUSE Leap 15.4 | bind | 9.16.6-150000.12.68.1 | SUSE-SU-2023:2954-1, SUSE-SU-2023:2794-1, SUSE-SU-2023:2667-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | bind +17 | 32:9.16.42-1.amzn2023.0.1 | ALAS2023-2023-240 |
| Amazon Linux 2 | bind +15 | 32:9.11.4-26.P2.amzn2.13.1 | ALAS2-2023-2112 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | bind | 9.16.33-2 | — |
| Azure Linux 2 (CBL-Mariner) | dhcp | 4.4.2-5 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | bind +9 | 32:9.16.23-11.el9_2.1 | ELSA-2023-4099 |
| Oracle Linux 8 | bind +16 | 32:9.11.36-8.el8_8.1 | ELSA-2023-4102 |
| Oracle Linux 8 | bind9.16 +8 | 32:9.16.23-0.14.el8_8.1 | ELSA-2023-4100 |
| Oracle Linux 7 | bind +15 | 32:9.11.4-26.P2.el7_9.14 | ELSA-2023-4152 |
Advisories 41
- ALSA-2023:4099 Important: bind security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:4100 Important: bind9.16 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:4102 Important: bind security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2024-0794 Dell ECS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 11, 2026
- RHSA-2023:4332 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2023:4154 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2023:4152 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2023:4153 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2023:4102 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2023:4100 Red Hat Security Advisory: bind9.16 security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2023:4101 Red Hat Security Advisory: bind security and bug fix update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2023:4099 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2023:4037 Red Hat Security Advisory: bind9.16 security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2023:4005 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- WID-SEC-2023-2917 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 30, 2026
- USN-6183-2 bind9 vulnerability Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-6183-1 bind9 vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5439-1 bind9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3498-1 bind9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2023:4100 Important: bind9.16 security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2023:4099 Important: bind security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2023:4102 Important: bind security update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2023:2793-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2667-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2836-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13015-1 bind-9.18.16-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2789-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2794-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-1533 Internet Systems Consortium BIND: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Jan 6, 2026
- WID-SEC-2023-2625 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 6, 2025
- SUSE-SU-2023:2954-1 Security update for bind SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2024-0064 Juniper Produkte: Mehrere Schwachstellen BSI CERT-Bund (WID) · Apr 10, 2025
- ICSA-25-105-08 ABB M2M Gateway CISA ICS & IT advisories · Apr 7, 2025
- 2NGA002579 ABB Arctic communication solution ARM600 Vulnerabilities ABB PSIRT · Apr 7, 2025
- WID-SEC-2024-1591 Juniper JUNOS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 11, 2024
- ALAS2023-2023-240 Important: bind security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jul 20, 2023
- ELSA-2023-4100 Important: bind9.16 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 20, 2023
- ELSA-2023-4152 Important: bind security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jul 20, 2023
- ELSA-2023-4102 Important: bind security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 20, 2023
- ALAS2-2023-2112 Important: bind security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jul 19, 2023
- ELSA-2023-4099 Important: bind security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jul 19, 2023
References
- CVE-2023-2828 vendor-advisory
- http://www.openwall.com/lists/oss-security/2023/06/21/6
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U3K6AJK7RRSR53HRF5GGKPA6PDUDWOD2/
- https://www.debian.org/security/2023/dsa-5439
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SEFCEVCTYEMKTWA7V7EYPI5YQQ4JWDLI/
- https://security.netapp.com/advisory/ntap-20230703-0010/
- https://lists.debian.org/debian-lts-announce/2023/07/msg00021.html