---
cve: "CVE-2026-71967"
severity: "MEDIUM"
cvss: 5.7
epss: "12%"
vendor: "OP-TEE"
kev: false
exploited: false
published: "2026-08-10 19:17:32"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-18T17:50:40+02:00"
---

# CVE-2026-71967

> 5.7 MEDIUM · 🧪 PoC

## Beschreibung

OP-TEE OS through 4.10.0, fixed in commit 0aadfc2, contains a null pointer dereference vulnerability in the Widevine pseudo-TA open_session handler that allows Normal World clients to cause a denial of service when CFG_WIDEVINE_PTA is enabled. Attackers can open a session directly on the Widevine PTA to trigger an unconditional dereference of a NULL calling session pointer via is_user_ta_ctx(), faulting the TEE at S-EL1 and crashing the trusted execution environment.

## CVSS-Vektor

```
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 753afbbee1682f5d16fd30e87b31058a4fd4f4b8 (Commit)
- 0aadfc23407f50e770eb5ddd871fc208f5626833 (Commit)

## Referenzen

- <https://github.com/OP-TEE/optee_os/pull/7899>
- <https://github.com/OP-TEE/optee_os/commit/0aadfc23407f50e770eb5ddd871fc208f5626833>
- <https://www.vulncheck.com/advisories/op-tee-os-null-pointer-dereference-dos-via-widevine-pta-open-session>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-71967) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_