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CVE-2025-40099

9.4 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: cifs: parse_dfs_referrals: prevent oob on malformed input Malicious SMB server can send invalid reply to FSCTL_DFS_GET_REFERRAL…

Published Oct 30, 2025EPSS 0.41%

Overview

CVE-2025-40099 is a critical-severity vulnerability. It was published on October 30, 2025 and has a CVSS 3.1 base score of 9.4 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.4, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

cifs: parse_dfs_referrals: prevent oob on malformed input

Malicious SMB server can send invalid reply to FSCTL_DFS_GET_REFERRALS

- reply smaller than sizeof(struct get_dfs_referral_rsp)

- reply with number of referrals smaller than NumberOfReferrals in the

header

Processing of such replies will cause oob.

Return -EINVAL error on such replies to prevent oob-s.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/15c73964da9df994302f579ed14ee5fdbce7a332Refgit.kernel.org/stable/c/6447b0e355562a1ff748c4a2ffb89aae7e84d2c9Refgit.kernel.org/stable/c/8bc4a8d39bac23d8b044fd3e2dbfd965f1d9b058Refgit.kernel.org/stable/c/bb0f2e66e1ac043a5b238f5bcab4f26f3c317039Refgit.kernel.org/stable/c/cfacc7441f760e4a73cc71b6ff1635261d534657

How CyberStrike helps

Frequently asked questions

What is CVE-2025-40099?

CVE-2025-40099 is a critical-severity vulnerability. It was published on October 30, 2025 and has a CVSS 3.1 base score of 9.4 (CRITICAL).

How severe is CVE-2025-40099?

This vulnerability has a CVSS 3.1 base score of 9.4, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-40099?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-40099?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-40099 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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