Description
Improper bounds checking in Dnsmasq before 2.76 allows an attacker controlled DNS server to send large DNS packets that result in a read operation beyond the buffer allocated for the packet, a different vulnerability than CVE-2017-14491.
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 | 2.76-1 | — |
| Debian 13 | dnsmasq | 2.76-1 | — |
| Debian 12 | dnsmasq | 2.76-1 | — |
| Debian 8 | dnsmasq | 2.72-3+deb8u5 | DLA-1921-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | dnsmasq | 2.75-1ubuntu0.16.04.10 | USN-4924-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | dnsmasq | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | dnsmasq +1 | 2.76-2.el7 | RHBA-2017:2117 |
Advisories 3
- RHBA-2017:2117 Red Hat Bug Fix Advisory: dnsmasq bug fix and enhancement update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DLA-1921-1 dnsmasq - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-4924-1 dnsmasq vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026