What’s Vulnerable › Vulnerabilities

CVE-2025-40204: sctp: Fix MAC comparison to be constant-time

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-11-12 · updated 2026-10-19

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.

Affected products

• Linux kernel: 2.6.12 — fixed in 6.18

How to fix

Upgrade to a fixed version: Linux kernel 6.18. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0b32ff285ff6f6f1ac1d9495787ccce8837d6405
• https://git.kernel.org/stable/c/0e8b8c326c2a6de4d837b1bb034ea704f4690d77
• https://git.kernel.org/stable/c/1cd60e0d0fb8f0e62ec4499138afce6342dc9d4c
• https://git.kernel.org/stable/c/8019b3699289fce3f10b63f98601db97b8d105b0
• https://git.kernel.org/stable/c/9c05d44ec24126fc283835b68f82dba3ae985209
• https://git.kernel.org/stable/c/b93fa8dc521d00d2d44bf034fb90e0d79b036617
• https://git.kernel.org/stable/c/dd91c79e4f58fbe2898dac84858033700e0e99fb
• https://git.kernel.org/stable/c/ed3044b9c810c5c24eb2830053fbfe5fd134c5d4

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