# CVE-2026-21991: dtrace: A DTrace component, dtprobed, allows arbitrary file creation through crafted USDT provider names.

CVE-2026-21991 is fixed in 3 products on 1 platform, first by ELSA-2026-50153, released March 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-21991
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0019
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 13, 2026

## Description

A DTrace component, dtprobed, allows arbitrary file creation through crafted USDT provider names.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | dtrace Debian 14 | 2.0.6-1 | [DEBIAN-CVE-2026-21991](https://patchblox.com/security/data/fix/linux/debian-cve-2026-21991.md) | Mar 16, 2026 |
| Linux | dtrace ol 10 | 0:2.0.6-1.el9 | [ELSA-2026-50153](https://patchblox.com/security/data/fix/linux/elsa-2026-50153.md) | Mar 13, 2026 |
| Linux | dtrace ol 8 | 0:2.0.6-1.el9 | [ELSA-2026-50152](https://patchblox.com/security/data/fix/linux/elsa-2026-50152.md) | Mar 13, 2026 |
| Linux | dtrace ol 9 | 0:2.0.6-1.el9 | [ELSA-2026-50153](https://patchblox.com/security/data/fix/linux/elsa-2026-50153.md) | Mar 13, 2026 |
| Linux | dtrace-devel ol 10 | 0:2.0.6-1.el9 | [ELSA-2026-50153](https://patchblox.com/security/data/fix/linux/elsa-2026-50153.md) | Mar 13, 2026 |
| Linux | dtrace-devel ol 8 | 0:2.0.6-1.el9 | [ELSA-2026-50152](https://patchblox.com/security/data/fix/linux/elsa-2026-50152.md) | Mar 13, 2026 |
| Linux | dtrace-devel ol 9 | 0:2.0.6-1.el9 | [ELSA-2026-50153](https://patchblox.com/security/data/fix/linux/elsa-2026-50153.md) | Mar 13, 2026 |
| Linux | dtrace-testsuite ol 10 | 0:2.0.6-1.el9 | [ELSA-2026-50153](https://patchblox.com/security/data/fix/linux/elsa-2026-50153.md) | Mar 13, 2026 |
| Linux | dtrace-testsuite ol 8 | 0:2.0.6-1.el9 | [ELSA-2026-50152](https://patchblox.com/security/data/fix/linux/elsa-2026-50152.md) | Mar 13, 2026 |
| Linux | dtrace-testsuite ol 9 | 0:2.0.6-1.el9 | [ELSA-2026-50153](https://patchblox.com/security/data/fix/linux/elsa-2026-50153.md) | Mar 13, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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