CVE-2023-3338 Crash due to a null pointer dereference in the dn_nsp_send function

What is CVE-2023-3338?

CVE-2023-3338 is a medium-severity vulnerability in Debian Debian Linux, published on 30 Jun 2023. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A null pointer dereference flaw was found in the Linux kernel's DECnet networking protocol. This issue could allow a remote user to crash the system.

Weakness: CWE-476

Which versions are affected by CVE-2023-3338?

It affects 3 products.

Products include Debian Debian Linux, Linux kernel, Netapp Active Iq Unified Manager.

How do I fix CVE-2023-3338?

Apply the vendor's patch.

Is CVE-2023-3338 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-3338 exists.

Public exploit code: 1 proofs of concept on GitHub.

Other vulnerabilities in Debian Debian Linux

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• 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-27636, AZL-31687, AZL-34801, AZL-61792, DEBIAN-CVE-2023-3338, GHSA-qj9w-7hh5-mf2q and 1 more.