Description
A single-byte, non-arbitrary write/use-after-free flaw was found in dnsmasq. This flaw allows an attacker who sends a crafted packet processed by dnsmasq, potentially causing a denial of service.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | dnsmasq | Not-Known | — |
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 | dnsmasq | 2.87-1 | — |
| Debian 13 | dnsmasq | 2.87-1 | — |
| Debian 12 | dnsmasq | 2.87-1 | — |
| Debian 11 | dnsmasq | 2.85-1+deb11u1 | DLA-3974-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | dnsmasq | 2.86-1.1ubuntu0.1 | USN-5408-1 |
| Ubuntu 20.04 LTS | dnsmasq | 2.80-1.1ubuntu1.5 | USN-5408-1 |
| Ubuntu 18.04 LTS | dnsmasq | 2.79-1ubuntu0.6 | USN-5408-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | dnsmasq | 2.75-1ubuntu0.16.04.10+esm1 | USN-5408-1 |
| Ubuntu Pro 14.04 LTS | dnsmasq | 2.68-1ubuntu0.2+esm1 | USN-5408-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | dnsmasq +1 | 2.85-5.el9 | RHSA-2022:8070 |
| RHEL 8 | dnsmasq +1 | 2.79-24.el8 | RHSA-2022:7633 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.6 EUS | dnsmasq +1 | 2.79-21.el8_6.5 | RHSA-2024:1545 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | dnsmasq +1 | 2.85-5.el9 | ALSA-2022:8070 |
| AlmaLinux 8 | dnsmasq +1 | 2.79-24.el8 | ALSA-2022:7633 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | dnsmasq | 2.85-5.el9 | RLSA-2022:8070 |
| Rocky Linux 8 | dnsmasq | 2.79-24.el8 | RLSA-2022:7633 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | dnsmasq | 2.86-150100.7.20.1 | SUSE-SU-2022:1307-1 |
| SLES 15 SP2 | dnsmasq | 2.86-150100.7.20.1 | SUSE-SU-2022:1307-1 |
| SLES 15 SP1 | dnsmasq | 2.86-150100.7.20.1 | SUSE-SU-2022:1307-1 |
| SLES 15 | dnsmasq | 2.78-150000.3.14.1 | SUSE-SU-2022:1288-1 |
| SLES 12 SP5 | dnsmasq | 2.78-18.18.1 | SUSE-SU-2022:1289-1 |
Show 28 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP4 | dnsmasq | 2.78-18.18.1 | SUSE-SU-2022:1289-1 |
| SLES 12 SP3 | dnsmasq | 2.78-18.18.1 | SUSE-SU-2022:1289-1 |
| SLES 12 SP2 | dnsmasq | 2.78-18.18.1 | SUSE-SU-2022:1289-1 |
| SLES 11 SP4 | dnsmasq | 2.78-0.17.18.1 | SUSE-SU-2022:14941-1 |
| SLES for SAP 15 SP2 | dnsmasq | 2.86-150100.7.20.1 | SUSE-SU-2022:1307-1 |
| SLES for SAP 15 SP1 | dnsmasq | 2.86-150100.7.20.1 | SUSE-SU-2022:1307-1 |
| SLES for SAP 15 | dnsmasq | 2.78-150000.3.14.1 | SUSE-SU-2022:1288-1 |
| SLES for SAP 12 SP5 | dnsmasq | 2.78-18.18.1 | SUSE-SU-2022:1289-1 |
| SLES for SAP 12 SP4 | dnsmasq | 2.78-18.18.1 | SUSE-SU-2022:1289-1 |
| SLES for SAP 12 SP3 | dnsmasq | 2.78-18.18.1 | SUSE-SU-2022:1289-1 |
| SLE Real Time 15 SP2 | dnsmasq | 2.86-150100.7.20.1 | SUSE-SU-2022:1307-1 |
| SLE Micro 5.2 | dnsmasq | 2.86-150100.7.20.1 | SUSE-SU-2022:1307-1 |
| SLE Micro 5.1 | dnsmasq | 2.86-150100.7.20.1 | SUSE-SU-2022:1307-1 |
| SLE Micro 5.0 | dnsmasq | 2.86-150100.7.20.1 | SUSE-SU-2022:1307-1 |
| SLE HPC 15 SP2 | dnsmasq | 2.86-150100.7.20.1 | SUSE-SU-2022:1307-1 |
| SLE HPC 15 SP1 | dnsmasq | 2.86-150100.7.20.1 | SUSE-SU-2022:1307-1 |
| SLE HPC 15 | dnsmasq | 2.78-150000.3.14.1 | SUSE-SU-2022:1288-1 |
| SUSE OpenStack Cloud Crowbar 9 | dnsmasq | 2.78-18.18.1 | SUSE-SU-2022:1289-1 |
| SUSE OpenStack Cloud Crowbar 8 | dnsmasq | 2.78-18.18.1 | SUSE-SU-2022:1289-1 |
| SUSE OpenStack Cloud 9 | dnsmasq | 2.78-18.18.1 | SUSE-SU-2022:1289-1 |
| SUSE OpenStack Cloud 8 | dnsmasq | 2.78-18.18.1 | SUSE-SU-2022:1289-1 |
| SUSE Manager Server 4.1 | dnsmasq | 2.86-150100.7.20.1 | SUSE-SU-2022:1307-1 |
| SUSE Manager Retail Branch Server 4.1 | dnsmasq | 2.86-150100.7.20.1 | SUSE-SU-2022:1307-1 |
| SUSE Manager Proxy 4.1 | dnsmasq | 2.86-150100.7.20.1 | SUSE-SU-2022:1307-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | dnsmasq | 2.78-0.16.17.1 | SUSE-SU-2022:14940-1 |
| SUSE HPE Helion OpenStack 8 | dnsmasq | 2.78-18.18.1 | SUSE-SU-2022:1289-1 |
| SUSE Enterprise Storage 7 | dnsmasq | 2.86-150100.7.20.1 | SUSE-SU-2022:1307-1 |
| SUSE Enterprise Storage 6 | dnsmasq | 2.86-150100.7.20.1 | SUSE-SU-2022:1307-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | dnsmasq | 2.86-4.1 | openSUSE-SU-2024:11998-1 |
| openSUSE Leap 15.3 | dnsmasq | 2.86-150100.7.20.1 | SUSE-SU-2022:1307-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | dnsmasq | 2.86-r1 | — |
| Alpine v3.23 | dnsmasq | 2.86-r1 | — |
| Alpine v3.22 | dnsmasq | 2.86-r1 | — |
| Alpine v3.21 | dnsmasq | 2.86-r1 | — |
| Alpine v3.20 | dnsmasq | 2.86-r1 | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | dnsmasq | 2.86-r1 | — |
| Alpine v3.18 | dnsmasq | 2.86-r1 | — |
| Alpine v3.17 | dnsmasq | 2.86-r1 | — |
| Alpine v3.16 | dnsmasq | 2.86-r1 | — |
| Alpine v3.15 | dnsmasq | 2.86-r1 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | dnsmasq +1 | 2.86-10.amzn2023.0.2 | ALAS2023-2023-039 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | dnsmasq | 2.89-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | dnsmasq +1 | 2.85-5.el9 | ELSA-2022-8070 |
| Oracle Linux 8 | dnsmasq +1 | 2.79-24.el8 | ELSA-2022-7633 |
| Oracle Linux 7 | dnsmasq +1 | 2.76-17.0.1.el7_9.3 | ELSA-2023-12946, ELSA-2023-12945 |
Advisories 23
- ALSA-2022:8070 Moderate: dnsmasq security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2022:7633 Moderate: dnsmasq security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
- USN-5408-1 dnsmasq vulnerability Ubuntu Security Notices (USN) · Jun 29, 2026
- RHSA-2024:1545 Red Hat Security Advisory: dnsmasq security update Red Hat Security Advisories (RHSA) · May 1, 2026
- DLA-3974-1 dnsmasq - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2022:8070 Moderate: dnsmasq security and bug fix update Rocky Linux Security Advisories · Feb 4, 2026
- RLSA-2022:7633 Moderate: dnsmasq security and bug fix update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2022:1307-1 Security update for dnsmasq SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:14941-1 Security update for dnsmasq SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:1288-1 Security update for dnsmasq SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11998-1 dnsmasq-2.86-4.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:1289-1 Security update for dnsmasq SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:14940-1 Security update for dnsmasq SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2022:8070 Red Hat Security Advisory: dnsmasq security and bug fix update Red Hat Security Advisories (RHSA) · Jan 27, 2026
- RHSA-2022:7633 Red Hat Security Advisory: dnsmasq security and bug fix update Red Hat Security Advisories (RHSA) · Jan 27, 2026
- WID-SEC-2024-0064 Juniper Produkte: Mehrere Schwachstellen BSI CERT-Bund (WID) · Apr 10, 2025
- WID-SEC-2022-1988 dnsmasq: Schwachstelle ermöglicht nicht spezifizierten Angriff BSI CERT-Bund (WID) · Dec 8, 2024
- WID-SEC-2023-0137 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 21, 2024
- ELSA-2023-12946 Important: dnsmasq security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 24, 2023
- ELSA-2023-12945 Important: dnsmasq security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 24, 2023
- ALAS2023-2023-039 Moderate: dnsmasq security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 22, 2023
- ELSA-2022-8070 Moderate: dnsmasq security and bug fix update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 22, 2022
- ELSA-2022-7633 Moderate: dnsmasq security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 15, 2022