---
cve: "CVE-2026-43383"
severity: "CRITICAL"
cvss: 9.4
epss: "44%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-05-08 15:16:49"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T09:47:22+02:00"
---

# CVE-2026-43383

> 9.4 CRITICAL

## Beschreibung

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-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Gering | warn |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- Kernel ≥ 5.10.253
- Kernel ≥ 5.15.210
- Kernel ≥ 6.1.167
- Kernel ≥ 6.6.130
- Kernel ≥ 6.12.78
- Kernel ≥ 6.18.19
- Kernel ≥ 6.19.9

## Referenzen

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

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-43383) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_