CVE-2026-8836 · cross-distro fix matrix

CVE-2026-8836: It was discovered that lwIP contained a buffer overflow in the EAP

Affects 4 Linux releases across 16 (distro × package) combinations. First disclosed: 2026-05-18.

CVSS v3:CRITICAL · 9.8(NVD-published)

Fix per ecosystem

Each block below is a distro release where CVE-2026-8836 has a known fix. Run the listed command on that distro to remediate.

Ubuntu focal

Source: Ubuntu USN

lwip→ fixed in2.1.2+dfsg1-4ubuntu0.1~esm1USN-8423-1
```
sudo apt-get install --only-upgrade -y lwip
```
liblwip-dev→ fixed in2.1.2+dfsg1-4ubuntu0.1~esm1USN-8423-1
```
sudo apt-get install --only-upgrade -y liblwip-dev
```
liblwip-doc→ fixed in2.1.2+dfsg1-4ubuntu0.1~esm1USN-8423-1
```
sudo apt-get install --only-upgrade -y liblwip-doc
```
liblwip0→ fixed in2.1.2+dfsg1-4ubuntu0.1~esm1USN-8423-1
```
sudo apt-get install --only-upgrade -y liblwip0
```

Ubuntu jammy

Source: Ubuntu USN

lwip→ fixed in2.1.3+dfsg1-1ubuntu0.1~esm1USN-8423-1
```
sudo apt-get install --only-upgrade -y lwip
```
liblwip-dev→ fixed in2.1.3+dfsg1-1ubuntu0.1~esm1USN-8423-1
```
sudo apt-get install --only-upgrade -y liblwip-dev
```
liblwip-doc→ fixed in2.1.3+dfsg1-1ubuntu0.1~esm1USN-8423-1
```
sudo apt-get install --only-upgrade -y liblwip-doc
```
liblwip0→ fixed in2.1.3+dfsg1-1ubuntu0.1~esm1USN-8423-1
```
sudo apt-get install --only-upgrade -y liblwip0
```

Ubuntu noble

Source: Ubuntu USN

lwip→ fixed in2.2.0+dfsg1-6.1ubuntu0.1~esm1USN-8423-1
```
sudo apt-get install --only-upgrade -y lwip
```
liblwip-dev→ fixed in2.2.0+dfsg1-6.1ubuntu0.1~esm1USN-8423-1
```
sudo apt-get install --only-upgrade -y liblwip-dev
```
liblwip-doc→ fixed in2.2.0+dfsg1-6.1ubuntu0.1~esm1USN-8423-1
```
sudo apt-get install --only-upgrade -y liblwip-doc
```
liblwip0t64→ fixed in2.2.0+dfsg1-6.1ubuntu0.1~esm1USN-8423-1
```
sudo apt-get install --only-upgrade -y liblwip0t64
```

Ubuntu resolute

Source: Ubuntu USN

lwip→ fixed in2.2.1+dfsg1-4ubuntu0.1~esm1USN-8423-1
```
sudo apt-get install --only-upgrade -y lwip
```
liblwip-dev→ fixed in2.2.1+dfsg1-4ubuntu0.1~esm1USN-8423-1
```
sudo apt-get install --only-upgrade -y liblwip-dev
```
liblwip-doc→ fixed in2.2.1+dfsg1-4ubuntu0.1~esm1USN-8423-1
```
sudo apt-get install --only-upgrade -y liblwip-doc
```
liblwip0t64→ fixed in2.2.1+dfsg1-4ubuntu0.1~esm1USN-8423-1
```
sudo apt-get install --only-upgrade -y liblwip0t64
```

Are YOU affected by CVE-2026-8836?

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.

curl https://mindsparkstack.com/scan.sh | bash

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Continuous monitoring beats manual checking

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