CVE-2026-43383: Linux Kernel

Critical severity, CVSS 9.4. EPSS: 0.7% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: net/tcp-md5: 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 Linux Kernel: from 2.6.20, before 5.10.253 (fixed in 5.10.253); from 5.11, before 6.1.167 (fixed in 6.1.167); from 6.2, before 6.6.130 (fixed in 6.6.130); from 6.7, before 6.12.78 (fixed in 6.12.78); from 6.13, before 6.18.19 (fixed in 6.18.19); from 6.19, before 6.19.9 (fixed in 6.19.9); …

Published 2026-05-08. Last modified 2026-06-19.