Description
A flaw was found in dnsmasq. A remote attacker could exploit an out-of-bounds write vulnerability by sending a specially crafted BOOTREPLY (Bootstrap Protocol Reply) packet to a dnsmasq server configured with the `--dhcp-split-relay` option. This can lead to memory corruption, causing the dnsmasq daemon to crash and resulting in a denial of service (DoS).
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | dnsmasq | 2.92 – < 2.93 | 2.93 |
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — |
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 | 2.92-4 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | dnsmasq | 2.92-1ubuntu0.3 | USN-8308-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | dnsmasq | 2.92rel2-18.27.1 | SUSE-SU-2026:2458-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | dnsmasq | 2.93-160000.1.1 | SUSE-SU-2026:22496-1 |
| SLES 16.0 | dnsmasq | 2.93-160000.1.1 | SUSE-SU-2026:22496-1 |
| SLE Micro 6.1 | dnsmasq | 2.93-slfo.1.1_1.1 | SUSE-SU-2026:22454-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | dnsmasq | 2.92-3.1 | openSUSE-SU-2026:10605-1 |
| openSUSE Leap 16.0 | dnsmasq | 2.93-160000.1.1 | openSUSE-SU-2026:21192-1 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | dnsmasq +1 | 2.93-r0 | — |
Advisories 7
- SUSE-SU-2026:22496-1 Security update for dnsmasq SUSE / openSUSE Security Updates · Jul 7, 2026
- WID-SEC-2026-1167 dnsmasq: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Jul 6, 2026
- SUSE-SU-2026:22454-1 Security update for dnsmasq SUSE / openSUSE Security Updates · Jul 4, 2026
- openSUSE-SU-2026:21192-1 Security update for dnsmasq SUSE / openSUSE Security Updates · Jul 3, 2026
- SUSE-SU-2026:2458-1 Security update for dnsmasq SUSE / openSUSE Security Updates · Jun 19, 2026
- USN-8308-1 dnsmasq vulnerability Ubuntu Security Notices (USN) · May 26, 2026
- openSUSE-SU-2026:10605-1 dnsmasq-2.92-3.1 on GA media SUSE / openSUSE Security Updates · Apr 24, 2026
References
- https://access.redhat.com/security/cve/CVE-2026-6507 vdb-entry
- RHBZ#2459181 issue-tracking