CVE-2026-21996 Denial of service in Oracle Linux
An unprivileged attacker can crash the dtrace process by providing a malicious ELF binary, causing a denial of service on Oracle Linux systems.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-21996?
CVE-2026-21996 is a low-severity denial of service vulnerability in Oracle Linux, published on 1 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An unprivileged attacker can reliably trigger a crash of the dtrace process with a malicious ELF binary due to an integer Divide-by-Zero in Pbuild_file_symtab()
Weakness: CWE-369
Which versions are affected by CVE-2026-21996?
It affects 1 product.
Products include Oracle Linux.
How do I fix CVE-2026-21996?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-21996 being exploited?
There is no known exploitation of CVE-2026-21996 in the wild and no public exploit code.
Other vulnerabilities in Oracle Linux
Sources
Also known as DEBIAN-CVE-2026-21996, GHSA-w2v2-5qjc-q2jw, UBUNTU-CVE-2026-21996.