CVE-2026-71967

Name	CVE-2026-71967
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1144386

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
optee-os (PTS)	trixie	4.5.0-2	vulnerable
	sid	4.10.0-2	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
optee-os	source	(unstable)	(unfixed)			1144386

Notes

[trixie] - optee-os <no-dsa> (Minor issue)
https://github.com/OP-TEE/optee_os/pull/7899
Fixed by: https://github.com/OP-TEE/optee_os/commit/0aadfc23407f50e770eb5ddd871fc208f5626833