CVE-2026-71967 OP-TEE OS 4.10.0 NULL Pointer Dereference DoS via Widevine PTA open_session
Attackers can crash the Trusted Execution Environment by triggering a null pointer dereference in the Widevine PTA handler when enabled.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-71967?
CVE-2026-71967 is a medium-severity vulnerability in OP-TEE optee_os, published on 10 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-476
Which versions are affected by CVE-2026-71967?
How do I fix CVE-2026-71967?
No fix has been published for CVE-2026-71967 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-71967 being exploited?
There is no known exploitation of CVE-2026-71967 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-71967, GHSA-cg97-7v4v-qg3v, UBUNTU-CVE-2026-71967.