CVE-2026-43383

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data tampering, service disruption.

Exploit odds

0.5% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-05-08 15:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-19 20:18 UTC Last updatedMost recent change to the record

Details

Published

2026-05-08 15:16 UTC

Last modified

2026-10-19 20:18 UTC

Exploit probability

0.5% · EPSS, next 30 days

Weakness

CWE-208

Record status

Modified

Affected

• Linux Kernel < 5.10.253
• Linux Kernel < 6.1.167
• Linux Kernel < 6.6.130
• Linux Kernel < 6.12.78
• Linux Kernel < 6.18.19
• Linux Kernel < 6.19.9
• Linux Kernel 7.0

Attack profile CVSS 3.1 · 9.4

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

High

Availability

High