# 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.

- **Severity:** Low 3.3 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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-2026-21996, GHSA-w2v2-5qjc-q2jw, UBUNTU-CVE-2026-21996

## 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 (Divide By Zero)

## Which versions are affected by CVE-2026-21996?

It affects 1 product.


Products: Oracle Linux.

## How do I fix CVE-2026-21996?

Apply the vendor's patch.

## 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

- [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-2026-21996 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-21996 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-2026-21996/ (Markdown: https://insights.sbomify.com/CVE-2026-21996/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-21996
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-21996
- OSV: https://osv.dev/vulnerability/CVE-2026-21996

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-21996/
Summaries are generated and may contain mistakes; the official description above is the record.