CVE-2025-38651

Kernel warning via zero randomized range

Published Aug 22, 2025 · Updated May 11, 2026

Range validation flaw in Linux 6.15 through 6.15.9 and 6.16.0 allows local users to trigger a warning in Landlock KUnit tests. The test_range2_rand16 path passes get_random_u8() directly to get_id_range(), which expects a positive first argument and warns when randomness produces zero. The condition requires local execution of the in-kernel Landlock KUnit suite; the published trace shows a warning while all 12 tests still pass.

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

What happened

Range validation flaw in Linux 6.15 through 6.15.9 and 6.16.0 allows local users to trigger a warning in Landlock KUnit tests. The test_range2_rand16 path passes get_random_u8() directly to get_id_range(), which expects a positive first argument and warns when randomness produces zero. The condition requires local execution of the in-kernel Landlock KUnit suite; the published trace shows a warning while all 12 tests still pass.

The record

CVE
CVE-2025-38651
Published
Aug 22, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6.15
  2. Affected versionversion=d9d2a68ed44bbae598a81cb95e0746fa6b13b57f <127183361b69dbb7ac3246ad4726f93400481249
  3. Affected versionversion=d9d2a68ed44bbae598a81cb95e0746fa6b13b57f <7d9ec2cfe12dd0d7c1a58213b9bef1bec66a3189
  4. Affected versionversion=d9d2a68ed44bbae598a81cb95e0746fa6b13b57f <e0a69cf2c03e61bd8069becb97f66c173d0d1fa1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.15; version=d9d2a68ed44bbae598a81cb95e0746fa6b13b57f <127183361b69dbb7ac3246ad4726f93400481249; version=d9d2a68ed44bbae598a81cb95e0746fa6b13b57f <7d9ec2cfe12dd0d7c1a58213b9bef1bec66a3189; version=d9d2a68ed44bbae598a81cb95e0746fa6b13b57f <e0a69cf2c03e61bd8069becb97f66c173d0d1fa1

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Canonical UbuntuCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

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