---
cve: "CVE-2020-12826"
severity: "MEDIUM"
cvss: 5.3
epss: "5.4%"
vendor: "Linux"
kev: false
exploited: false
published: "2020-05-12 19:15:11"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-14T11:19:47+02:00"
---

# CVE-2020-12826

> 5.3 MEDIUM

## Beschreibung

A signal access-control issue was discovered in the Linux kernel before 5.6.5, aka CID-7395ea4e65c2. Because exec_id in include/linux/sched.h is only 32 bits, an integer overflow can interfere with a do_notify_parent protection mechanism. A child process can send an arbitrary signal to a parent process in a different security domain. Exploitation limitations include the amount of elapsed time before an integer overflow occurs, and the lack of scenarios where signals to a parent process present a substantial operational threat.

## CVSS-Vektor

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

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

## Referenzen

- <https://bugzilla.redhat.com/show_bug.cgi?id=1822077>
- <https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.5>
- <https://github.com/torvalds/linux/commit/7395ea4e65c2a00d23185a3f63ad315756ba9cef>
- <https://lists.debian.org/debian-lts-announce/2020/06/msg00011.html>
- <https://lists.debian.org/debian-lts-announce/2020/06/msg00013.html>
- <https://lists.openwall.net/linux-kernel/2020/03/24/1803>
- <https://security.netapp.com/advisory/ntap-20200608-0001/>
- <https://usn.ubuntu.com/4367-1/>
- <https://usn.ubuntu.com/4369-1/>
- <https://usn.ubuntu.com/4391-1/>
- <https://www.openwall.com/lists/kernel-hardening/2020/03/25/1>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2020-12826) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_