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NVD / CVE Program· CNA Linux

CVE-2025-40109: crypto: rng - Ensure set_ent is always present

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.22% (FIRST EPSS).
  • Fixed version: Linux Linux 15d6f42da1bb527629d8e1067b1302d58dec9166, 17acbcd44fe8dc17dc1072375e76df2d52da6ac8, 915cb75983bc5e8b80f8a2f25a4af463f7b18c14; azl3 kernel 6.6.104.2-4 on Azure Linux 3.0 6.6.112.1-2.

Low priority for now. Upgrade to Linux Linux 15d6f42da1bb527629d8e1067b1302d58dec9166, 17acbcd44fe8dc17dc1072375e76df2d52da6ac8, 915cb75983bc5e8b80f8a2f25a4af463f7b18c14; azl3 kernel 6.6.104.2-4 on Azure Linux 3.0 6.6.112.1-2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: crypto: rng - Ensure set_ent is always present Ensure that set_ent is always set since only drbg provides it.

—No exploit Fix available
Published
Nov 9, 2025
Updated
Oct 19, 2026
EPSS
0.2% · 12th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2025-40109

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.10affected
    • 77ebdabe8de7c02f43c6de3357f79ff96f9f0579 and later · before 15d6f42da1bb527629d8e1067b1302d58dec9166affected · git
    • 77ebdabe8de7c02f43c6de3357f79ff96f9f0579 and later · before bd903c25b652c331831226cdf56c8179d18e43f4affected · git
    • 77ebdabe8de7c02f43c6de3357f79ff96f9f0579 and later · before 17acbcd44fe8dc17dc1072375e76df2d52da6ac8affected · git
    • 77ebdabe8de7c02f43c6de3357f79ff96f9f0579 and later · before ab172f4f42626549b02bada05f09e3f2b0cc26ecaffected · git
    • 77ebdabe8de7c02f43c6de3357f79ff96f9f0579 and later · before c5c703b50e91dd4748769f4c5ab50d9ad60be370affected · git
    • 77ebdabe8de7c02f43c6de3357f79ff96f9f0579 and later · before e247a7d138e514a40edda7c4d72c8bd49bb2cad3affected · git
    • 77ebdabe8de7c02f43c6de3357f79ff96f9f0579 and later · before 915cb75983bc5e8b80f8a2f25a4af463f7b18c14affected · git
    • 77ebdabe8de7c02f43c6de3357f79ff96f9f0579 and later · before c0d36727bf39bb16ef0a67ed608e279535ebf0daaffected · git
    • before 5.10not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.158-16.1.158-1
Debian:13linuxbefore 6.12.57-16.12.57-1
Debian:14linuxbefore 6.17.6-16.17.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2025-40107Nov 3, 2025 · can: hi311x: fix null pointer dereference when resuming from sleep before interface was enabled
    0Monitor
  • ← EarlierCVE-2025-40108Nov 9, 2025 · serial: qcom-geni: Fix blocked task
    0Monitor
  • Later →CVE-2025-40110Nov 12, 2025 · drm/vmwgfx: Fix a null-ptr access in the cursor snooper
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux15d6f42da1bb527629d8e1067b1302d58dec9166Vendor (CNA)
Linux Linux17acbcd44fe8dc17dc1072375e76df2d52da6ac8Vendor (CNA)
Linux Linux915cb75983bc5e8b80f8a2f25a4af463f7b18c14Vendor (CNA)
Linux Linuxab172f4f42626549b02bada05f09e3f2b0cc26ecVendor (CNA)
Linux Linuxbd903c25b652c331831226cdf56c8179d18e43f4Vendor (CNA)
Linux Linuxc0d36727bf39bb16ef0a67ed608e279535ebf0daVendor (CNA)
Linux Linuxc5c703b50e91dd4748769f4c5ab50d9ad60be370Vendor (CNA)
Linux Linuxe247a7d138e514a40edda7c4d72c8bd49bb2cad3Vendor (CNA)
azl3 kernel 6.6.104.2-4 on Azure Linux 3.06.6.112.1-2 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.158-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records