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CVE-2025-21994

7.6 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix incorrect validation for num_aces field of smb_acl parse_dcal() validate num_aces to allocate posix_ace_state_array.

Published Apr 2, 2025EPSS 0.31%

Overview

CVE-2025-21994 is a high-severity vulnerability. It was published on April 2, 2025 and has a CVSS 3.1 base score of 7.6 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.6, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

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

ksmbd: fix incorrect validation for num_aces field of smb_acl

parse_dcal() validate num_aces to allocate posix_ace_state_array.

if (num_aces > ULONG_MAX / sizeof(struct smb_ace *))

It is an incorrect validation that we can create an array of size ULONG_MAX.

smb_acl has ->size field to calculate actual number of aces in request buffer

size. Use this to check invalid num_aces.

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/1b8b67f3c5e5169535e26efedd3e422172e2db64Refgit.kernel.org/stable/c/9c4e202abff45f8eac17989e549fc7a75095f675Refgit.kernel.org/stable/c/a4cb17797a5d241f1e509cb5b46ed95a80c2f5fdRefgit.kernel.org/stable/c/c3a3484d9d31b27a3db0fab91fcf191132d65236Refgit.kernel.org/stable/c/d0f87370622a853b57e851f7d5a5452b72300f19Refgit.kernel.org/stable/c/f6a6721802ac2f12f4c1bbe839a4c229b61866f2Reflists.debian.org/debian-lts-announce/2025/05/msg00045.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-21994?

CVE-2025-21994 is a high-severity vulnerability. It was published on April 2, 2025 and has a CVSS 3.1 base score of 7.6 (HIGH).

How severe is CVE-2025-21994?

This vulnerability has a CVSS 3.1 base score of 7.6, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-21994?

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-2025-21994?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-21994 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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