Description
In specific circumstances, due to a weakness in the Pseudo Random Number Generator (PRNG) that is used, it is possible for an attacker to predict the source port and query ID that BIND will use.
This issue affects BIND 9 versions 9.16.0 through 9.16.50, 9.18.0 through 9.18.39, 9.20.0 through 9.20.13, 9.21.0 through 9.21.12, 9.16.8-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.39-S1, and 9.20.9-S1 through 9.20.13-S1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ISC | BIND 9 | 9.16.0 – ≤ 9.16.50, 9.18.0 – ≤ 9.18.39, 9.20.0 – ≤ 9.20.13, 9.21.0 – ≤ 9.21.12, 9.16.8-S1 – ≤ 9.16.50-S1, 9.18.11-S1 – ≤ 9.18.39-S1, 9.20.9-S1 – ≤ 9.20.13-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 | 1:9.20.15-1 | — |
| Debian 13 | bind9 | 1:9.20.15-1~deb13u1 | DSA-6033-1 |
| Debian 12 | bind9 | 1:9.18.41-1~deb12u1 | DSA-6033-1 |
| Debian 11 | bind9 | 1:9.16.50-1~deb11u4 | DLA-4364-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | bind9 | 1:9.20.11-1ubuntu3 | — |
| Ubuntu 26.04 LTS | isc-dhcp | No fix yet | — |
| Ubuntu 25.10 | bind9 | 1:9.20.11-1ubuntu2.1 | USN-7836-1 |
| Ubuntu 25.10 | isc-dhcp | No fix yet | — |
| Ubuntu 24.04 LTS | bind9 | 1:9.18.39-0ubuntu0.24.04.2 | USN-7836-1 |
| Ubuntu 24.04 LTS | isc-dhcp | No fix yet | — |
| Ubuntu 22.04 LTS | bind9 | 1:9.18.39-0ubuntu0.22.04.2 | USN-7836-1 |
| Ubuntu 22.04 LTS | bind9-libs | No fix yet | — |
| Ubuntu 20.04 LTS | bind9-libs | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | isc-dhcp | No fix yet | — |
| Ubuntu Pro 20.04 LTS | bind9 | 1:9.18.30-0ubuntu0.20.04.2+esm1 | USN-7836-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | bind +7 | 32:9.18.33-4.el10_0.2 | RHSA-2025:21034, RHSA-2025:19912 |
| RHEL 9 | bind +9 | 32:9.16.23-31.el9_6.2 | RHSA-2025:21110, RHSA-2025:19951 |
| RHEL 9 | bind9.18 +6 | 32:9.18.29-4.el9_6.2 | RHSA-2025:21111, RHSA-2025:19950 |
| RHEL 8 | bind9.16 +8 | 32:9.16.23-0.22.el8_10.4 | RHSA-2025:19793 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | bind +9 | 32:9.16.23-18.el9_4.10 | RHSA-2025:21817 |
| RHEL 9.2 E4S | bind +7 | 32:9.16.23-11.el9_2.9 | RHSA-2025:21887 |
| RHEL 9.0 E4S | bind +7 | 32:9.16.23-1.el9_0.11 | RHSA-2025:21889 |
| RHEL 8.8 TUS | bind9.16 +6 | 32:9.16.23-0.14.el8_8.7 | RHSA-2025:21939 |
| RHEL 8.8 E4S | bind9.16 +6 | 32:9.16.23-0.14.el8_8.7 | RHSA-2025:21939 |
| RHEL 8.6 TUS | bind9.16 +4 | 32:9.16.23-0.7.el8_6.9 | RHSA-2025:22168 |
| RHEL 8.6 E4S | bind9.16 +4 | 32:9.16.23-0.7.el8_6.9 | RHSA-2025:22168 |
| RHEL 8.6 AUS | bind9.16 +4 | 32:9.16.23-0.7.el8_6.9 | RHSA-2025:22168 |
| Red Hat Hardened Images 1 | bind +6 | 9.18.48-1.hum1 | RHSA-2026:6935 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | bind +5 | 32:9.18.33-10.el10_1.2 | ALSA-2025:21034 |
| AlmaLinux 10 | bind-doc +1 | 32:9.18.33-4.el10_0.2 | ALSA-2025:21034, ALSA-2025:19912 |
| AlmaLinux 9 | bind +9 | 32:9.16.23-34.el9_7.1 | ALSA-2025:21110 |
| AlmaLinux 9 | bind9.18 +6 | 32:9.18.29-4.el9_6.2 | ALSA-2025:21111, ALSA-2025:19950 |
| AlmaLinux 8 | bind9.16 +8 | 32:9.16.23-0.22.el8_10.4 | ALSA-2025:19793 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | bind | 2:9.18.33-10.el10_1.2 | RLSA-2025:21034 |
| Rocky Linux 9 | bind | 2:9.16.23-34.el9_7.1 | RLSA-2025:21110 |
| Rocky Linux 9 | bind9.18 | 2:9.18.29-5.el9_7.2 | RLSA-2025:21111 |
| Rocky Linux 8 | bind9.16 | 2:9.16.23-0.22.el8_10.4 | RLSA-2025:19793 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | bind | 9.16.6-150300.22.53.1 | SUSE-SU-2025:4109-1, SUSE-SU-2025:3903-1 |
| SLES 15 SP6 | bind | 9.16.6-150300.22.53.1 | SUSE-SU-2025:4110-1, SUSE-SU-2025:4109-1 |
| SLES 15 SP5 | bind | 9.16.50-150500.8.32.1 | SUSE-SU-2025:4108-1 |
| SLES 15 SP4 | bind | 9.16.50-150400.5.56.1 | SUSE-SU-2025:4107-1 |
| SLES 15 SP3 | bind | 9.16.6-150300.22.53.1 | SUSE-SU-2025:4109-1 |
Show 14 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | bind | 9.20.15-160000.1.1 | SUSE-SU-2026:20085-1 |
| SLES for SAP 15 SP5 | bind | 9.16.50-150500.8.32.1 | SUSE-SU-2025:4108-1 |
| SLES for SAP 15 SP4 | bind | 9.16.50-150400.5.56.1 | SUSE-SU-2025:4107-1 |
| SLES for SAP 15 SP3 | bind | 9.16.6-150300.22.53.1 | SUSE-SU-2025:4109-1 |
| SLES 16.0 | bind | 9.20.15-160000.1.1 | SUSE-SU-2026:20085-1 |
| SLE Micro 5.5 | bind | 9.16.50-150500.8.32.1 | SUSE-SU-2025:4108-1 |
| SLE HPC 15 SP5 | bind | 9.16.50-150500.8.32.1 | SUSE-SU-2025:4108-1 |
| SLE HPC 15 SP4 | bind | 9.16.50-150400.5.56.1 | SUSE-SU-2025:4107-1 |
| SLE HPC 15 SP3 | bind | 9.16.6-150300.22.53.1 | SUSE-SU-2025:4109-1 |
| SUSE Multi Linux Manager Tools SLE-Micro-5 | bind | 9.16.6-150000.12.85.1 | SUSE-SU-2025:4222-1 |
| SUSE Manager Server LTS 4.3 | bind | 9.16.50-150400.5.56.1 | SUSE-SU-2025:4107-1 |
| SUSE Manager Proxy LTS 4.3 | bind | 9.16.50-150400.5.56.1 | SUSE-SU-2025:4107-1 |
| SUSE Manager Client Tools for SLE Micro 5 | bind | 9.16.6-150000.12.85.1 | SUSE-SU-2025:4222-1 |
| SUSE Enterprise Storage 7.1 | bind | 9.16.6-150300.22.53.1 | SUSE-SU-2025:4109-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | bind | 9.20.15-1.1 | openSUSE-SU-2025:15659-1 |
| openSUSE Leap 16.0 | bind | 9.20.15-160000.1.1 | openSUSE-SU-2026:20039-1 |
| openSUSE Leap 15.6 | bind | 9.18.33-150600.3.18.1 | SUSE-SU-2025:4110-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | bind | 9.20.15-r0 | — |
| Alpine v3.23 | bind | 9.20.15-r0 | — |
| Alpine v3.22 | bind | 9.20.15-r0 | — |
| Alpine v3.21 | bind | 9.18.41-r0 | — |
| Alpine v3.20 | bind | 9.18.41-r0 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | bind | 9.18.41-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | bind +7 | 32:9.18.33-1.amzn2023.0.4 | ALAS2023-2025-1255 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | bind | 9.20.15-1 | — |
| Azure Linux 2 (CBL-Mariner) | bind | 9.16.50-3 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | bind +7 | 32:9.18.33-4.0.1.el10_0.2 | ELSA-2025-21034, ELSA-2025-19912 |
| Oracle Linux 9 | bind +9 | 32:9.16.23-31.0.1.el9_6.2 | ELSA-2025-21110, ELSA-2025-19951 |
| Oracle Linux 9 | bind9.18 +6 | 32:9.18.29-4.el9_6.2 | ELSA-2025-21111, ELSA-2025-19950 |
| Oracle Linux 8 | bind9.16 +8 | 32:9.16.23-0.22.el8_10.4 | ELSA-2025-19793 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | bind +5 | 9.20.16-r0 | — |
| Wolfi rolling | bind-dev | 9.20.15-r0 | — |
Advisories 46
- ALSA-2025:21034 Important: bind security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:21111 Important: bind9.18 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:19950 Important: bind9.18 security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:21110 Important: bind security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:19912 Important: bind security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:19793 Important: bind9.16 security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2025-2392 Internet Systems Consortium BIND: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 14, 2026
- RHSA-2026:6935 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2025:22168 Red Hat Security Advisory: bind9.16 security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2025:21889 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2025:21939 Red Hat Security Advisory: bind9.16 security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2025:21887 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2025:21817 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2025:21111 Red Hat Security Advisory: bind9.18 security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2025:21110 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2025:21034 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2025:19951 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2025:19912 Red Hat Security Advisory: bind security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2025:19950 Red Hat Security Advisory: bind9.18 security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- RHSA-2025:19793 Red Hat Security Advisory: bind9.16 security update Red Hat Security Advisories (RHSA) · Oct 14, 2026
- USN-7836-1 bind9 vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-7836-2 bind9 vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- openSUSE-SU-2026:20039-1 Security update for bind SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15659-1 bind-9.20.15-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20085-1 Security update for bind SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:4222-1 Security update for bind SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:3903-1 Security update for bind SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:4107-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:4110-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:4109-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:4108-1 Security update for bind SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2025-21034 Important: bind security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Dec 2, 2025
- ELSA-2025-21111 Important: bind9.18 security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 25, 2025
- ELSA-2025-21110 Important: bind security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 25, 2025
- RLSA-2025:21110 Important: bind security update Rocky Linux Security Advisories · Nov 21, 2025
- RLSA-2025:21111 Important: bind9.18 security update Rocky Linux Security Advisories · Nov 21, 2025
- RLSA-2025:21034 Important: bind security update Rocky Linux Security Advisories · Nov 21, 2025
- ELSA-2025-19951 Important: bind security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 10, 2025
- ELSA-2025-19950 Important: bind9.18 security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 10, 2025
- RLSA-2025:19793 Important: bind9.16 security update Rocky Linux Security Advisories · Nov 6, 2025
- ELSA-2025-19912 Important: bind security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Nov 6, 2025
- ALAS2023-2025-1255 Important: bind security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Nov 5, 2025
- ELSA-2025-19793 Important: bind9.16 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 5, 2025
- DLA-4364-1 bind9 - security update Debian Security (DSA / DLA) · Nov 4, 2025
- NCSC-2025-0341 Kwetsbaarheden verholpen in BIND 9 NCSC-NL (Netherlands) · Oct 27, 2025
- DSA-6033-1 bind9 - security update Debian Security (DSA / DLA) · Oct 23, 2025
References
- CVE-2025-40780 vendor-advisory