CVE-2026-35233 Null dereference in Oracle Linux
An unprivileged attacker can crash dtrace or potentially execute code in a privileged context by crafting a malicious ELF binary with an out-of-range sh_link field.
- 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-2026-35233?
CVE-2026-35233 is a medium-severity 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 craft a user-space process with a malicious ELF binary containing an out-of-range sh_link field. When root-level dtrace attaches to -- or instruments -- that process (via dtrace -p , pid probes, or USDT), the ELF parser reads heap memory beyond the allocated section cache array without any bounds check. This results in an uninitialized/out-of-bounds heap read that can cause a NULL pointer dereference crash of the dtrace process (DoS), or -- depending on heap layout -- a read-then-use of a garbage pointer controlled by adjacent allocations, providing a foothold toward further exploitation in a privileged context.
Weakness: CWE-125
Which versions are affected by CVE-2026-35233?
It affects 1 product.
Products include Oracle Linux.
How do I fix CVE-2026-35233?
Apply the vendor's patch.
Is CVE-2026-35233 being exploited?
There is no known exploitation of CVE-2026-35233 in the wild and no public exploit code.
Other vulnerabilities in Oracle Linux
Sources
Also known as DEBIAN-CVE-2026-35233, GHSA-cjc5-j2ff-wq2w, UBUNTU-CVE-2026-35233.