What’s Vulnerable › Vulnerabilities

CVE-2026-43384: net/tcp-ao: Fix MAC comparison to be constant-time

• Severity: critical (CVSS 9.8 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: 2026-05-08 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: net/tcp-ao: 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: from 6.7 before 6.12.78; from 6.13 before 6.18.19; from 6.19 before 6.19.9; 7.0-rc1, 7.0-rc2 — fixed in 6.12.78, 6.18.19, 6.19.9

How to fix

Upgrade to a fixed version: Linux kernel 6.12.78, 6.18.19, 6.19.9. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/080b0e210088296dd50d6637c06c1db14246adfe
• https://git.kernel.org/stable/c/67edfec516d30d3e62925c397be4a1e5185802fc
• https://git.kernel.org/stable/c/8be6ed64966da48b6c4726918f106c18742a5125
• https://git.kernel.org/stable/c/a269cbdc442f8658bca35383e34b9d0b0ff95a1c

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