What is CVE-2026-21991?

CVE-2026-21991 is a medium-severity vulnerability in Oracle Linux, classified under Path Traversal. CVSS score: 5.5/10. Published 2026-03-16.

How severe is CVE-2026-21991?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Path Traversal in Oracle Linux

CVE-2026-21991

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

Vulnerability class: Path Traversal (Directory Traversal)

Published 2026-03-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (6.9th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 6.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Oracle Linux — versions 8, 9, 10
Oracle Corporation Linux — versions 8, 9, 10

Weakness classification (CWE)

CWE-22 — Path Traversal

References

linux.oracle.com/cve/CVE-2026-21991.html (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-21991?: CVE-2026-21991 is a medium-severity vulnerability in Oracle Linux, classified under Path Traversal. CVSS score: 5.5/10. Published 2026-03-16.
How severe is CVE-2026-21991?: Medium severity. CVSS v3 base score is 5.5 out of 10.