Information Exposure Through Timing Discrepancy in Linux kernel - CVE-2026-43384
Published: May 9, 2026
Vulnerability identifier: #VU130802
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-43384
CWE-ID: CWE-208
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass message authentication.
The vulnerability exists due to observable timing differences in MAC comparison in tcp-ao when verifying authentication codes. A remote attacker can measure response timing during crafted network interactions to bypass message authentication.
How to mitigate CVE-2026-43384
Install security update from vendor's repository.