OP-TEE OS 4.10.0 NULL Pointer Dereference DoS via Widevine PTA open_session (CVE-2026-71967) | HOL Guard CVE

Medium · CVSS 5.5CVE-2026-71967

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

Answer in brief

CVE-2026-71967 records a Medium severity (CVSS 5.5) vulnerability in OP-TEE OS 4.10.0 NULL Pointer Dereference DoS via Widevine PTA open_session. The current sources do not mark it as known exploited. The current feed maps OP-TEE/optee_os (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 10, 2026Updated Sep 16, 2026Source checked Sep 24, 2026First seen by HOL Aug 10, 2026Material review Sep 16, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.5
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps OP-TEE/optee_os (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
OP-TEE/optee_osgeneric	0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for OP-TEE/optee_os.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 10, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.