CVE-2026-21991

Local arbitrary file creation via crafted provider names

Published Mar 16, 2026 · Updated Mar 16, 2026

Path traversal in dtprobed in Oracle Linux 8 through 10 allows local users to create arbitrary files via crafted USDT provider names. The daemon accepts an untrusted provider name from a probe description and uses it to create a file without restricting the resulting path to its intended directory. Low-privileged local access is required; the published assessment reports availability impact only, with no confidentiality or integrity impact.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in dtprobed in Oracle Linux 8 through 10 allows local users to create arbitrary files via crafted USDT provider names. The daemon accepts an untrusted provider name from a probe description and uses it to create a file without restricting the resulting path to its intended directory. Low-privileged local access is required; the published assessment reports availability impact only, with no confidentiality or integrity impact.

The record

CVE
CVE-2026-21991
Published
Mar 16, 2026
Updated
Mar 16, 2026
Vendor
Oracle
Product
Oracle Linux
Classifications
CWE-22, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10
  2. Affected versionversion=8
  3. Affected versionversion=9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Oracle · Oracle Linuxversion=10; version=8; version=9

Published CVSS scores

5.5OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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