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TI-2026-50262 Aliases CVE-2026-71967GHSA-cg97-7v4v-qg3v

OP-TEE OS 4.10.0 NULL Pointer Dereference DoS via Widevine PTA open_session

Priority LOW 25CWE-476Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-476.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0017 6th percentileScored 2026-11-07
Fix Fixed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
OP-TEEoptee_osup to 4.10.0—Patch availableCNA
  • optee_os VendorOP-TEE Affected up to 4.10.0 Fixed in — Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:o:trustedfirmware:op-tee:*:*:*:*:*:*:*:*——OP-TEE
  • cpe:2.3:o:trustedfirmware:op-tee:*:*:*:*:*:*:*:* Versions — — ·OP-TEE

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-71967
  2. 2026-10-03 Alias added: GHSA-cg97-7v4v-qg3v

References

Patch 1

Other 1

  • TI-2021-09019 In Arm Trusted Firmware M through 1.2, the NS world may trigger a system halt, an… KEVCVSS 3.1MEDIUM 5.5
  • TI-2022-22796 OP-TEE Trusted OS vulnerable to Improper Validation of Array Index in the cleanup_shm_refs function CVSS 3.1HIGH 8.8
  • TI-2026-29072 OP-TEE has a Use-After-Free race in FF-A shared-memory teardown CVSS 3.1HIGH 7.8
  • TI-2025-29404 REE userspace code can panic TAs, leading to fTPM PCR reset and data disclosure CVSS 3.1HIGH 7.9
  • TI-2023-21925 OP-TEE double free in shdr_verify_signature CVSS 3.1HIGH 7.4
  • TI-2026-33359 OP-TEE vulnerable to ECDH private key recovery CVSS 3.1MEDIUM 4.7
See all 90 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences