---
cve: "CVE-2019-20908"
severity: "MEDIUM"
cvss: 6.7
epss: "3.1%"
vendor: "Linux"
kev: false
exploited: false
published: "2020-07-15 22:15:13"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-10T23:13:57+02:00"
---

# CVE-2019-20908

> 6.7 MEDIUM

## Beschreibung

An issue was discovered in drivers/firmware/efi/efi.c in the Linux kernel before 5.4. Incorrect access permissions for the efivar_ssdt ACPI variable could be used by attackers to bypass lockdown or secure boot restrictions, aka CID-1957a85b0032.

## CVSS-Vektor

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

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

## Referenzen

- <http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.html>
- <http://www.openwall.com/lists/oss-security/2020/07/20/6>
- <http://www.openwall.com/lists/oss-security/2020/07/29/3>
- <http://www.openwall.com/lists/oss-security/2020/07/30/2>
- <http://www.openwall.com/lists/oss-security/2020/07/30/3>
- <https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4>
- <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1957a85b0032a81e6482ca4aab883643b8dae06e>
- <https://git.zx2c4.com/american-unsigned-language/tree/american-unsigned-language.sh>
- <https://mailarchives.bentasker.co.uk/Mirrors/OSSSec/2020/06-Jun/msg00035.html>
- <https://usn.ubuntu.com/4426-1/>
- <https://usn.ubuntu.com/4427-1/>
- <https://usn.ubuntu.com/4439-1/>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2019-20908) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_