CVE-2018-11743 Null dereference in n/a

What is CVE-2018-11743?

CVE-2018-11743 is a critical vulnerability in Debian Debian Linux, published on 5 Jun 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The init_copy function in kernel.c in mruby 1.4.1 makes initialize_copy calls for TT_ICLASS objects, which allows attackers to cause a denial of service (mrb_hash_keys uninitialized pointer and application crash) or possibly have unspecified other impact.

Weakness: CWE-824

Which versions are affected by CVE-2018-11743?

It affects 2 products.

Products include Debian Debian Linux, Mruby Mruby.

How do I fix CVE-2018-11743?

Upgrade to a fixed version.

Is CVE-2018-11743 being exploited?

There is no known exploitation of CVE-2018-11743 in the wild and no public exploit code.

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 DEBIAN-CVE-2018-11743, GHSA-7w9j-h3hj-wc9g, UBUNTU-CVE-2018-11743.