CVE-2026-43383
Critical
Description
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.
SeverityCritical
CVSS9.4
Exploit probability—
Product
Linux Kernel
PublishedMay 8, 2026
First seenMay 8, 2026
Weakness typeCWE-208CWE-208
How to fix
Update
- linux linux_kernel5.10.253, 6.1.167, 6.6.130, 6.12.78, 6.18.19, 6.19.9 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 2.6.20 ≤ v < 5.10.253, 5.11 ≤ v < 6.1.167, 6.2 ≤ v < 6.6.130, 6.7 ≤ v < 6.12.78, 6.13 ≤ v < 6.18.19, 6.19 ≤ v < 6.19.9, 7.0 | 5.10.253, 6.1.167, 6.6.130, 6.12.78, 6.18.19, 6.19.9 |
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