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VulnerabilityPublished Updated

CVE-2025-40109: Linux kernel · crypto: rng – Ensure set_ent is always present

Affects Linux kernelSource GCVE Database

0

Not known to be exploited · fixed in 5.15.0-1100.107~20.04.2 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:05 UTC

Severity
Medium

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS
0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 5.15.0-1100.107~20.04.2, 5.15.0-1110.119~20.04.1, 5.15.0-1100.109~20.04.1 +64

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Nov 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
Ubuntu 25.10linuxpkg:deb/ubuntu/linux@6.17.0-7.7?arch=source&distro=questingOther threatsAffected
  • <6.17.0-7.7
Fixed in
  • 6.17.0-7.7
Ubuntu 25.10linux-awspkg:deb/ubuntu/linux-aws@6.17.0-1004.4?arch=source&distro=questingOther threatsAffected
  • <6.17.0-1004.4
Fixed in
  • 6.17.0-1004.4
Ubuntu 25.10linux-azurepkg:deb/ubuntu/linux-azure@6.17.0-1006.6?arch=source&distro=questingOther threatsAffected
  • <6.17.0-1006.6
Fixed in
  • 6.17.0-1006.6
Ubuntu 25.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde@6.17.0-1017.17?arch=source&distro=questingOther threatsAffected
  • 6.17.0-1003.3 – 6.17.0-1017.17
10 affected builds
Fixed in–
Ubuntu 25.10linux-gcppkg:deb/ubuntu/linux-gcp@6.17.0-1004.4?arch=source&distro=questingOther threatsAffected
  • <6.17.0-1004.4
Fixed in
  • 6.17.0-1004.4
Ubuntu 25.10linux-oraclepkg:deb/ubuntu/linux-oracle@6.17.0-1005.5?arch=source&distro=questingOther threatsAffected
  • <6.17.0-1005.5
Fixed in
  • 6.17.0-1005.5

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

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.

References

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