BaseFortify

Publication date: 2025-11-12

Last updated on: 2025-11-14

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: sctp: Fix MAC comparison to be constant-time To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-11-12

Last Modified

2025-11-14

Generated

2026-07-06

AI Q&A

2025-11-13

EPSS Evaluated

2026-07-05

NVD

CVE-2025-40204

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability in the Linux kernel involves the comparison of Message Authentication Codes (MACs) in a way that is not constant-time, which can allow timing attacks. The fix ensures that MAC comparisons are done using a constant-time helper function to prevent attackers from gaining information through timing differences.

Impact Analysis

If exploited, this vulnerability could allow an attacker to perform timing attacks to potentially reveal sensitive information from MAC comparisons, which could compromise the integrity and security of communications or data protected by these MACs.

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