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Vulnerability record · CVE-2026-43383 · published 8 May 2026

CVE-2026-43383: Linux kernel vulnerability

Linux · Linux Kernel

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.

9.4 CVSS 3.1 Critical EPSS 0.65% · top 50.9%
9.4CVSS 3.1 base score
0.65%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
19 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/02669e2a4d207068edce7e8b5fafd85822018ce6 Patch
https://git.kernel.org/stable/c/345a9530756528d7ca407663d659c3c40e75c3dd Patch
https://git.kernel.org/stable/c/46d0d6f50dab706637f4c18a470aac20a21900d3 Patch
https://git.kernel.org/stable/c/5d305a95130a8d08b9545e47f1e18d29d59866cb Patch
https://git.kernel.org/stable/c/821c8751fdeecdeecabeb11704dd33439c9e4bbc Patch
https://git.kernel.org/stable/c/ae3831b44f477de048287493e184fc3ff913b624 Patch
https://git.kernel.org/stable/c/b502e97e29d791ff7a8051f29a414535739be218 Patch
https://git.kernel.org/stable/c/ff44ec94d4fc8348600a69de0a8fa1102c23bce8

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Source: NIST National Vulnerability Database (record CVE-2026-43383), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.