CVE-2024-27396 net: gtp: Fix Use-After-Free in gtp_dellink

What is CVE-2024-27396?

CVE-2024-27396 is a high-severity use after free vulnerability in Debian Debian Linux, published on 9 May 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

net: gtp: Fix Use-After-Free in gtp_dellink

Since call_rcu, which is called in the hlist_for_each_entry_rcu traversal of gtp_dellink, is not part of the RCU read critical section, it is possible that the RCU grace period will pass during the traversal and the key will be free.

To prevent this, it should be changed to hlist_for_each_entry_safe.

Weakness: CWE-416

Which versions are affected by CVE-2024-27396?

It affects 2 products.

Products include Debian Debian Linux, Linux kernel.

How do I fix CVE-2024-27396?

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-2024-27396 being exploited?

There is no known exploitation of CVE-2024-27396 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 AZL-40565, BELL-CVE-2024-27396, DEBIAN-CVE-2024-27396, GHSA-mvq3-v998-w43f, UBUNTU-CVE-2024-27396.