CVE-2026-2291 · cross-distro fix matrix

CVE-2026-2291: Andrew S. Fasano, Royce M, and Hugo Martinez Ray discovered that Dnsmasq

Affects 10 Linux releases across 33 (distro × package) combinations. First disclosed: 2026-05-12.

Fix per ecosystem

Each block below is a distro release where CVE-2026-2291 has a known fix. Run the listed command on that distro to remediate.

Ubuntu bionic

Source: Ubuntu USN

dnsmasq→ fixed in2.90-0ubuntu0.18.04.1+esm3USN-8268-1
```
sudo apt-get install --only-upgrade -y dnsmasq
```
dnsmasq-base→ fixed in2.90-0ubuntu0.18.04.1+esm3USN-8268-1
```
sudo apt-get install --only-upgrade -y dnsmasq-base
```
dnsmasq-base-lua→ fixed in2.90-0ubuntu0.18.04.1+esm3USN-8268-1
```
sudo apt-get install --only-upgrade -y dnsmasq-base-lua
```
dnsmasq-utils→ fixed in2.90-0ubuntu0.18.04.1+esm3USN-8268-1
```
sudo apt-get install --only-upgrade -y dnsmasq-utils
```

Ubuntu focal

Source: Ubuntu USN

dnsmasq→ fixed in2.90-0ubuntu0.20.04.1+esm2USN-8268-1
```
sudo apt-get install --only-upgrade -y dnsmasq
```
dnsmasq-base→ fixed in2.90-0ubuntu0.20.04.1+esm2USN-8268-1
```
sudo apt-get install --only-upgrade -y dnsmasq-base
```
dnsmasq-base-lua→ fixed in2.90-0ubuntu0.20.04.1+esm2USN-8268-1
```
sudo apt-get install --only-upgrade -y dnsmasq-base-lua
```
dnsmasq-utils→ fixed in2.90-0ubuntu0.20.04.1+esm2USN-8268-1
```
sudo apt-get install --only-upgrade -y dnsmasq-utils
```

Ubuntu jammy

Source: Ubuntu USN

dnsmasq→ fixed in2.90-0ubuntu0.22.04.3USN-8268-1
```
sudo apt-get install --only-upgrade -y dnsmasq
```
dnsmasq-base→ fixed in2.90-0ubuntu0.22.04.3USN-8268-1
```
sudo apt-get install --only-upgrade -y dnsmasq-base
```
dnsmasq-base-lua→ fixed in2.90-0ubuntu0.22.04.3USN-8268-1
```
sudo apt-get install --only-upgrade -y dnsmasq-base-lua
```
dnsmasq-utils→ fixed in2.90-0ubuntu0.22.04.3USN-8268-1
```
sudo apt-get install --only-upgrade -y dnsmasq-utils
```

Ubuntu noble

Source: Ubuntu USN

dnsmasq→ fixed in2.90-2ubuntu0.3USN-8268-1

sudo apt-get install --only-upgrade -y dnsmasq

dnsmasq-base→ fixed in2.90-2ubuntu0.3USN-8268-1

sudo apt-get install --only-upgrade -y dnsmasq-base

dnsmasq-base-lua→ fixed in2.90-2ubuntu0.3USN-8268-1

sudo apt-get install --only-upgrade -y dnsmasq-base-lua

dnsmasq-utils→ fixed in2.90-2ubuntu0.3USN-8268-1

sudo apt-get install --only-upgrade -y dnsmasq-utils

Ubuntu questing

Source: Ubuntu USN

dnsmasq→ fixed in2.91-1ubuntu0.2USN-8268-1

sudo apt-get install --only-upgrade -y dnsmasq

dnsmasq-base→ fixed in2.91-1ubuntu0.2USN-8268-1

sudo apt-get install --only-upgrade -y dnsmasq-base

dnsmasq-base-lua→ fixed in2.91-1ubuntu0.2USN-8268-1

sudo apt-get install --only-upgrade -y dnsmasq-base-lua

dnsmasq-utils→ fixed in2.91-1ubuntu0.2USN-8268-1

sudo apt-get install --only-upgrade -y dnsmasq-utils

Ubuntu resolute

Source: Ubuntu USN

dnsmasq→ fixed in2.92-1ubuntu0.2USN-8268-1

sudo apt-get install --only-upgrade -y dnsmasq

dnsmasq-base→ fixed in2.92-1ubuntu0.2USN-8268-1

sudo apt-get install --only-upgrade -y dnsmasq-base

dnsmasq-base-lua→ fixed in2.92-1ubuntu0.2USN-8268-1

sudo apt-get install --only-upgrade -y dnsmasq-base-lua

dnsmasq-utils→ fixed in2.92-1ubuntu0.2USN-8268-1

sudo apt-get install --only-upgrade -y dnsmasq-utils

Ubuntu trusty

Source: Ubuntu USN

dnsmasq→ fixed in2.68-1ubuntu0.2+esm5USN-8268-1
```
sudo apt-get install --only-upgrade -y dnsmasq
```
dnsmasq-base→ fixed in2.68-1ubuntu0.2+esm5USN-8268-1
```
sudo apt-get install --only-upgrade -y dnsmasq-base
```
dnsmasq-utils→ fixed in2.68-1ubuntu0.2+esm5USN-8268-1
```
sudo apt-get install --only-upgrade -y dnsmasq-utils
```

Ubuntu xenial

Source: Ubuntu USN

dnsmasq→ fixed in2.90-0ubuntu0.16.04.1+esm3USN-8268-1
```
sudo apt-get install --only-upgrade -y dnsmasq
```
dnsmasq-base→ fixed in2.90-0ubuntu0.16.04.1+esm3USN-8268-1
```
sudo apt-get install --only-upgrade -y dnsmasq-base
```
dnsmasq-base-lua→ fixed in2.90-0ubuntu0.16.04.1+esm3USN-8268-1
```
sudo apt-get install --only-upgrade -y dnsmasq-base-lua
```
dnsmasq-utils→ fixed in2.90-0ubuntu0.16.04.1+esm3USN-8268-1
```
sudo apt-get install --only-upgrade -y dnsmasq-utils
```

Debian bookworm

Source: Debian Security Tracker

dnsmasq→ fixed in2.90-4~deb12u2urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y dnsmasq
```

Debian trixie

Source: Debian Security Tracker

dnsmasq→ fixed in2.91-1+deb13u1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y dnsmasq
```

Are YOU affected by CVE-2026-2291?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

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