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CVE-2026-43384 - Vulnerability Analysis

CriticalCVSS: 9.8

Last Updated: May 11, 2026

Linux Kernel - Timing Attack

Published: May 8, 2026Updated: May 11, 2026Remote Exploitable

Overview

Linux kernel contains a timing attack vulnerability caused by non-constant-time MAC comparison in net/tcp-ao, letting attackers potentially infer MAC values via timing analysis, exploit requires network access.

Severity & Score

Severity: Critical

CVSS Score: 9.8

Impact

Attackers can perform timing attacks to infer MAC values, potentially compromising authentication integrity.

Mitigation

Update to the latest Linux kernel version with the MAC comparison fix.

References

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

Related Resources

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Details

CVE ID: CVE-2026-43384
Severity: Critical
CVSS Score: 9.8
Type: undefined
Status: new

CVSS Metrics

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H