CVE-2026-43383 - Vulnerability Analysis
CriticalCVSS: 9.4Last 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-md5, letting attackers potentially infer MAC values, exploit requires network access to trigger timing measurement.
Severity & Score
Severity: Critical
CVSS Score: 9.4
Impact
Attackers can perform timing attacks to infer MAC values, potentially compromising authentication integrity.
Mitigation
Update to the latest Linux kernel version with the fix for constant-time MAC comparison.
References
- https://git.kernel.org/stable/c/b502e97e29d791ff7a8051f29a414535739be218
- https://git.kernel.org/stable/c/02669e2a4d207068edce7e8b5fafd85822018ce6
- https://git.kernel.org/stable/c/345a9530756528d7ca407663d659c3c40e75c3dd
- https://git.kernel.org/stable/c/46d0d6f50dab706637f4c18a470aac20a21900d3
- https://git.kernel.org/stable/c/5d305a95130a8d08b9545e47f1e18d29d59866cb
- https://git.kernel.org/stable/c/821c8751fdeecdeecabeb11704dd33439c9e4bbc
- https://git.kernel.org/stable/c/ae3831b44f477de048287493e184fc3ff913b624
Related Resources
Details
- CVE ID
- CVE-2026-43383
- Severity
- Critical
- CVSS Score
- 9.4
- Type
- undefined
- Status
- new
CVSS Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H