CVE-2024-44986 ipv6: fix possible UAF in ip6_finish_output2()

What is CVE-2024-44986?

CVE-2024-44986 is a high-severity use after free vulnerability in Debian Debian Linux, published on 4 Sep 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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

ipv6: fix possible UAF in ip6_finish_output2()

If skb_expand_head() returns NULL, skb has been freed and associated dst/idev could also have been freed.

We need to hold rcu_read_lock() to make sure the dst and associated idev are alive.

Weakness: CWE-416

Which versions are affected by CVE-2024-44986?

It affects 2 products.

Products include Debian Debian Linux, Linux kernel.

How do I fix CVE-2024-44986?

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-2024-44986 being exploited?

There is no known exploitation of CVE-2024-44986 in the wild and no public exploit code.

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-48611, AZL-48686, BELL-CVE-2024-44986, DEBIAN-CVE-2024-44986, GHSA-x53w-73fx-jmfj, ROOT-OS-DEBIAN-11-CVE-2024-44986 and 1 more.