# 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.

- **Severity:** Medium 4.4 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L`)
- **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:** Yes
- **Published:** 1 May 2026
- **Updated:** 1 May 2026
- **Also known as:** DEBIAN-CVE-2026-35233, GHSA-cjc5-j2ff-wq2w, UBUNTU-CVE-2026-35233

## 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 (Out-of-bounds Read)

## Which versions are affected by CVE-2026-35233?

It affects 1 product.


Products: 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

- [CVE-2015-5287](https://insights.sbomify.com/CVE-2015-5287/): Red Hat Automatic Bug Reporting Tool Privilege Escalation (high 7.8, exploited in the wild)
- [CVE-2016-5408](https://insights.sbomify.com/CVE-2016-5408/): Memory corruption in n/a (critical 9.8)
- [CVE-2016-1714](https://insights.sbomify.com/CVE-2016-1714/): Memory corruption in n/a (high 8.1)
- [CVE-2015-3812](https://insights.sbomify.com/CVE-2015-3812/): Denial of service in n/a (high 7.8)
- [CVE-2015-2328](https://insights.sbomify.com/CVE-2015-2328/): Denial of service in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-35233 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-35233 in the wild and no public exploit code.

Affected product: Oracle Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-35233/ (Markdown: https://insights.sbomify.com/CVE-2026-35233/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-35233
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-35233
- OSV: https://osv.dev/vulnerability/CVE-2026-35233

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-35233/
Summaries are generated and may contain mistakes; the official description above is the record.