Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/OP-TEE/optee_os/commit/0aadfc23407f50e770eb5ddd871fc208f56268
- https://github.com/OP-TEE/optee_os/pull/7899
- https://www.vulncheck.com/advisories/op-tee-os-null-pointer-dereference-dos-via-
FAQ
What is CVE-2026-71967?
CVE-2026-71967 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 o...
How severe is CVE-2026-71967?
CVE-2026-71967 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-71967?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.