CVE-2019-3896 Use after free in kernel

What is CVE-2019-3896?

CVE-2019-3896 is a high-severity use after free vulnerability in Linux kernel, published on 18 Jun 2019. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A double-free can happen in idr_remove_all() in lib/idr.c in the Linux kernel 2.6 branch. An unprivileged local attacker can use this flaw for a privilege escalation or for a system crash and a denial of service (DoS).

Weakness: CWE-415, CWE-416

Which versions are affected by CVE-2019-3896?

It affects 5 products.

Products include Linux kernel, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Server, Redhat Enterprise Linux Server Aus, Redhat Enterprise Linux Workstation.

How do I fix CVE-2019-3896?

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-2019-3896 being exploited?

There is no known exploitation of CVE-2019-3896 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2019-3896, GHSA-2p8m-h2q6-92v8, UBUNTU-CVE-2019-3896.