CVE-2025-40021: linux

CVSS: UnknownDeferred
AliasesUBUNTU-CVE-2025-40021DEBIAN-CVE-2025-40021
Published 24-10-2025Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2025-40021 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 10.1% of scored vulnerabilities.

Overall risk
0/100
0100
Minimal · default modelHow is this calculated?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.21%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 44 · Related 39
DLA-4379-1DLA-4404-1DSA-6053-1MGASA-2025-0309MGASA-2025-0310OPENSUSE-SU-2025:20172-1

Timeline

  1. 24-10-2025
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: tracing: dynevent: Add a missing lockdown check on dynevent Since dynamic_events interface on tracefs is compatible with kprobe_events and uprobe_events, it should also check the lockdown status and reject if it is set.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.21%

Chance of exploitation in the next 30 days

Percentile

10%

Versus all other CVEs

30-day change

+0.01 pp

From 0.19% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.21%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu143 products
  • linuxAll versions (No fix recorded) | < 5.15.0-170.180 | < 6.8.0-106.106 | < 6.17.0-6.6
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1100.107 | < 6.8.0-1050.53 | < 6.17.0-1003.3
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.158-1 | < 6.12.57-1 | < 6.16.10-1
Linux1 product
  • linux≥ 17911ff38aa58d3c95c07589dbf5d3564c4cf3c5, < f3ac1f4eaba58e57943efa3e8b8d71fa7aab0abf | ≥ 17911ff38aa58d3c95c07589dbf5d3564c4cf3c5, < 0d41604d2d53c1abe27fefb54b37a8f6642a4d74 | ≥ 17911ff38aa58d3c95c07589dbf5d3564c4cf3c5, < 07b1f63b5f86765793fab44d3d4c2be681cddafb | ≥ 17911ff38aa58d3c95c07589dbf5d3564c4cf3c5, < 3887f3814c0e770e6b73567fe0f83a2c01a6470c | ≥ 17911ff38aa58d3c95c07589dbf5d3564c4cf3c5, < 573b1e39edfcb7b4eecde0f1664455a1f4462eee | ≥ 17911ff38aa58d3c95c07589dbf5d3564c4cf3c5, < b47c4e06687a5a7b6c6ef4bd303fcfe4430b26bb | ≥ 17911ff38aa58d3c95c07589dbf5d3564c4cf3c5, < 456c32e3c4316654f95f9d49c12cbecfb77d5660 | 5.4

3 vendors · 145 products

References

36 links
Show all 36 references