---
cve: "CVE-2023-4911"
severity: "HIGH"
cvss: 7.8
epss: "81.4%"
vendor: "Red Hat"
kev: true
exploited: true
published: "2023-10-03 17:25:08"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T21:44:07+02:00"
---

# CVE-2023-4911

> 7.8 HIGH · ⚠️ CISA KEV (1034 Tage) · 🔓 Exploited

## Beschreibung

A buffer overflow was discovered in the GNU C Library's dynamic loader ld.so while processing the GLIBC_TUNABLES environment variable. This issue could allow a local attacker to use maliciously crafted GLIBC_TUNABLES environment variables when launching binaries with SUID permission to execute code with elevated privileges.

## CVSS-Vektor

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

| 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 | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Exploit-Evidenz

- [EDB-52479 — glibc 2.38 - Buffer Overflow](https://www.exploit-db.com/exploits/52479)

## Patch verfügbar (OSV)

- ef321e23c20eebc6d6fb4044425c00e6df27b05f (Commit)
- ef321e23c20eebc6d6fb4044425c00e6df27b05f (Commit)

## Referenzen

- <https://access.redhat.com/errata/RHSA-2023:5453>
- <https://access.redhat.com/errata/RHSA-2023:5454>
- <https://access.redhat.com/errata/RHSA-2023:5455>
- <https://access.redhat.com/errata/RHSA-2023:5476>
- <https://access.redhat.com/errata/RHSA-2024:0033>
- <https://access.redhat.com/security/cve/CVE-2023-4911>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2238352>
- <https://www.qualys.com/2023/10/03/cve-2023-4911/looney-tunables-local-privilege-escalation-glibc-ld-so.txt>
- <https://www.qualys.com/cve-2023-4911/>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2023-4911) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_