CVE-2017-11176 Use after free in n/a

What is CVE-2017-11176?

CVE-2017-11176 is a high-severity use after free vulnerability in Debian Debian Linux, published on 11 Jul 2017. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

The mq_notify function in the Linux kernel through 4.11.9 does not set the sock pointer to NULL upon entry into the retry logic. During a user-space close of a Netlink socket, it allows attackers to cause a denial of service (use-after-free) or possibly have unspecified other impact.

Weakness: CWE-416

Which versions are affected by CVE-2017-11176?

It affects 2 products.

Products include Debian Debian Linux, Linux kernel.

How do I fix CVE-2017-11176?

Apply the vendor's patch.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2017-11176 being exploited?

There is no known exploitation of CVE-2017-11176 in the wild and no public exploit code.

Public exploit code: 1 Exploit-DB entry and 6 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 DEBIAN-CVE-2017-11176, GHSA-h5wm-hc9w-hp9m, UBUNTU-CVE-2017-11176.