CVE-2025-21994

What it is

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.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. High risk of service disruption.

Exploit odds

0.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2025-04-02 14:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-07-30 06:22 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.3% in the next 30 days (EPSS).
• Severity: 7.6 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2025-04-02 14:16 UTC

Last modified

2026-07-30 06:22 UTC

Exploit probability

0.3% · EPSS, next 30 days

Record status

Modified

Affected

• Linux Kernel < 5.15.180
• Linux Kernel < 6.1.132
• Linux Kernel < 6.6.85
• Linux Kernel < 6.12.21
• Linux Kernel < 6.13.9
• Linux Kernel 6.14

Attack profile CVSS 3.1 · 7.6

Attack vector

Network

Complexity

Low

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2025-21994.md and follow it. Check whether this project is affected by CVE-2025-21994. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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