CVE-2021-42008 Memory corruption in n/a

What is CVE-2021-42008?

CVE-2021-42008 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 4 Oct 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

The decode_data function in drivers/net/hamradio/6pack.c in the Linux kernel before 5.13.13 has a slab out-of-bounds write. Input from a process that has the CAP_NET_ADMIN capability can lead to root access.

Weakness: CWE-787

Which versions are affected by CVE-2021-42008?

It affects 11 products.

Products include Debian Debian Linux, Linux kernel, Netapp H300e Firmware, Netapp H300s Firmware, Netapp H410c Firmware, Netapp H410s Firmware and 5 more.

How do I fix CVE-2021-42008?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-42008 being exploited?

There is no known exploitation of CVE-2021-42008 in the wild and no public exploit code.

Public exploit code: 3 proofs of concept on GitHub.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-6598, DEBIAN-CVE-2021-42008, GHSA-qv6w-x298-fgf8, UBUNTU-CVE-2021-42008.