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CVE-2025-40109

11
FAUCET Score

CVE-2025-40109 addresses a vulnerability in the Linux kernel's cryptographic random number generator (RNG) where the 'set_ent' function was not consistently present, specifically impacting non-DRBG implementations. While a direct CVSS score is unavailable, its FAUCET Risk Score of 5/100 suggests a low severity, indicating a limited attack surface and potential impact. There is currently no evidence of active exploitation, no public exploit code (Metasploit, Nuclei, ExploitDB), and minimal community discussion or media coverage, suggesting a low-profile vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
LinuxLinux
5.10CNA affecteddefault affected
LinuxLinux
>= 77ebdabe8de7c02f43c6de3357f79ff96f9f0579, < 15d6f42da1bb527629d8e1067b1302d58dec9166, >= 77ebdabe8de7c02f43c6de3357f79ff96f9f0579, < 17acbcd44fe8dc17dc1072375e76df2d52da6ac8, >= 77ebdabe8de7c02f43c6de3357f79ff96f9f0579, < 915cb75983bc5e8b80f8a2f25a4af463f7b18c14, >= 77ebdabe8de7c02f43c6de3357f79ff96f9f0579, < ab172f4f42626549b02bada05f09e3f2b0cc26ec, >= 77ebdabe8de7c02f43c6de3357f79ff96f9f0579, < bd903c25b652c331831226cdf56c8179d18e43f4, >= 77ebdabe8de7c02f43c6de3357f79ff96f9f0579, < c0d36727bf39bb16ef0a67ed608e279535ebf0da, >= 77ebdabe8de7c02f43c6de3357f79ff96f9f0579, < c5c703b50e91dd4748769f4c5ab50d9ad60be370, >= 77ebdabe8de7c02f43c6de3357f79ff96f9f0579, < e247a7d138e514a40edda7c4d72c8bd49bb2cad3CNA affecteddefault unaffected

CVSS Data

CVSS data has not been published for this CVE.

Exploit Intelligence

EPSS Score
0.21%
Probability of exploitation in next 30 days
EPSS Percentile
10.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15

Social Chatter

Media Mentions

Remediation

Patch Available

Vendor Patches (37)

microsoftpatch availablevia msrc
Product: 20553-17084Fixed in: 6.6.112.1-2
microsoftpatch availablevia msrc
Product: azl3 kernel 6.6.104.2-4 on Azure Linux 3.0Fixed in: 6.6.112.1-2
ubuntupatch availablevia ubuntu_usn
Product: linux-fips (noble)Fixed in: 6.8.0-106.106+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp-fips (noble)Fixed in: 6.8.0-1052.55+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia-6.8 (jammy)Fixed in: 6.8.0-1049.52~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia (noble)Fixed in: 6.8.0-1049.52
ubuntupatch availablevia ubuntu_usn
Product: linux-nvidia-lowlatency (noble)Fixed in: 6.8.0-1049.52.1
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp-6.8 (jammy)Fixed in: 6.8.0-1052.55~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-hwe-6.8 (jammy)Fixed in: 6.8.0-106.106~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-ibm-6.8 (jammy)Fixed in: 6.8.0-1049.49~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-lowlatency-hwe-6.8 (jammy)Fixed in: 6.8.0-106.106.1~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-oracle-6.8 (jammy)Fixed in: 6.8.0-1047.48~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux (noble)Fixed in: 6.8.0-106.106
ubuntupatch availablevia ubuntu_usn
Product: linux-aws (noble)Fixed in: 6.8.0-1050.53
ubuntupatch availablevia ubuntu_usn
Product: linux-gcp (noble)Fixed in: 6.8.0-1052.55
ubuntupatch availablevia ubuntu_usn
Product: linux-gke (noble)Fixed in: 6.8.0-1048.53
ubuntupatch availablevia ubuntu_usn
Product: linux-gkeop (noble)Fixed in: 6.8.0-1035.38
ubuntupatch availablevia ubuntu_usn
Product: linux-aws-fips (noble)Fixed in: 6.8.0-1050.53+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-fips (noble)Fixed in: 6.8.0-1052.58+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-fips (jammy)Fixed in: 5.15.0-1109.118+fips1
ubuntupatch availablevia ubuntu_usn
Product: linux-azure (jammy)Fixed in: 5.15.0-1109.118
ubuntupatch availablevia ubuntu_usn
Product: linux-ibm (noble)Fixed in: 6.8.0-1049.49
ubuntupatch availablevia ubuntu_usn
Product: linux-lowlatency (noble)Fixed in: 6.8.0-106.106.1
ubuntupatch availablevia ubuntu_usn
Product: linux-oracle (noble)Fixed in: 6.8.0-1047.48
ubuntupatch availablevia ubuntu_usn
Product: linux-realtime-6.8 (jammy)Fixed in: 6.8.1-1045.46~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-realtime (noble)Fixed in: 6.8.1-1045.46
ubuntupatch availablevia ubuntu_usn
Product: linux-aws-6.8 (jammy)Fixed in: 6.8.0-1050.53~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-6.8 (jammy)Fixed in: 6.8.0-1051.57~22.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-azure (noble)Fixed in: 6.8.0-1051.57
ubuntupatch availablevia ubuntu_usn
Product: linux-azure-5.15 (focal)Fixed in: 5.15.0-1110.119~20.04.1
ubuntupatch availablevia ubuntu_usn
Product: linux-xilinx (noble)Fixed in: 6.8.0-1029.30
ubuntupatch availablevia ubuntu_usn
Product: linux-raspi (noble)Fixed in: 6.8.0-1050.54
ubuntupatch availablevia ubuntu_usn
Product: linux-raspi-realtime (noble)Fixed in: 6.8.0-2040.41
ubuntupatch availablevia ubuntu_usn
Product: linux-raspi (jammy)Fixed in: 5.15.0-1097.100
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 10Fixed in: kernel
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: kernel-rt
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: kernel

Vendor Advisories (16)

ubuntuUSN-8261-1

Linux kernel (Xilinx) vulnerabilities

May 7, 2026
ubuntuUSN-8243-1

Linux kernel (Azure) vulnerabilities

May 7, 2026
ubuntuUSN-8163-2

Linux kernel (Azure) vulnerabilities

Apr 13, 2026
ubuntuUSN-8165-1

Linux kernel (Azure FIPS) vulnerabilities

Apr 9, 2026
ubuntuUSN-8163-1

Linux kernel (Azure FIPS) vulnerabilities

Apr 9, 2026
ubuntuUSN-8095-5

Linux kernel (Raspberry Pi) vulnerabilities

Apr 1, 2026
ubuntuUSN-8141-1

Linux kernel (Raspberry Pi) vulnerabilities

Apr 1, 2026
ubuntuUSN-8126-1

Linux kernel (Azure) vulnerabilities

Mar 25, 2026
ubuntuUSN-8125-1

Linux kernel (Azure) vulnerabilities

Mar 25, 2026
ubuntuUSN-8095-4

Linux kernel (AWS) vulnerabilities

Mar 23, 2026
ubuntuUSN-8095-3

Linux kernel (Real-time) vulnerabilities

Mar 17, 2026
ubuntuUSN-8095-2

Linux kernel (FIPS) vulnerabilities

Mar 16, 2026
ubuntuUSN-8100-1

Linux kernel (NVIDIA) vulnerabilities

Mar 16, 2026
ubuntuUSN-8095-1

Linux kernel vulnerabilities

Mar 16, 2026
microsoft2025-Nov/CVE-2025-40109Moderate

crypto: rng - Ensure set_ent is always present

Nov 11, 2025
redhatCVE-2025-40109Moderate

kernel: Linux kernel: Denial of Service in crypto random number generator due to missing set_ent

Nov 9, 2025

References

git.kernel.org / stable/c/15d6f42da1bb527629d8e1067b1302d58dec9166
git.kernel.org / stable/c/17acbcd44fe8dc17dc1072375e76df2d52da6ac8
git.kernel.org / stable/c/915cb75983bc5e8b80f8a2f25a4af463f7b18c14
git.kernel.org / stable/c/ab172f4f42626549b02bada05f09e3f2b0cc26ec
git.kernel.org / stable/c/bd903c25b652c331831226cdf56c8179d18e43f4
git.kernel.org / stable/c/c0d36727bf39bb16ef0a67ed608e279535ebf0da
git.kernel.org / stable/c/c5c703b50e91dd4748769f4c5ab50d9ad60be370
git.kernel.org / stable/c/e247a7d138e514a40edda7c4d72c8bd49bb2cad3