Vulnerability · Published Aug 10, 2026 · Assigned by VulnCheck

CVE-2026-71967OP-TEE OS 4.10.0 NULL Pointer Dereference DoS via Widevine PTA open_session

Medium 5.5

In plain English

A medium-severity null pointer dereference in optee_os from OP-TEE. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% of all known vulnerabilities).

Severity (CVSS 3.1)5.5Medium

Exploit odds (30 days)0.2%top 93.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:13	optee-os	no fix listed	DEBIAN-CVE-2026-71967
Ubuntu:26.04:LTS	optee-os	no fix listed	UBUNTU-CVE-2026-71967
Ubuntu:26.10	optee-os	no fix listed	UBUNTU-CVE-2026-71967

Affected products (as reported)

Vendor	Product	Versions
OP-TEE	optee_os	0 – through 4.10.0

Weakness: CWE-476 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

Pull Request issue-tracking
Patch Commit patch
https://www.vulncheck.com/advisories/op-tee-os-null-pointer-dereference-dos-via-widevine-pta-open-session third-party-advisory