CVE-2026-71968

Name	CVE-2026-71968
Description	OP-TEE OS through 4.10.0, fixed in commit 8794043, contains a use-after-free vulnerability in the Trusted Application loader that allows attackers with the ability to load a signed Trusted Application to corrupt secure-world kernel memory by setting the TA_FLAG_CONCURRENT flag in a user TA signed header. Attackers can cause two concurrent sessions to operate on the same shared context without locking, corrupting the uctx->vm_info.regions list during memref parameter mapping and unmapping to free vm_region nodes still in use, resulting in a use-after-free in S-EL1 secure-world kernel memory.
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/7900
Fixed by: https://github.com/OP-TEE/optee_os/commit/8794043c4065c26a2b8b1313794ba5ba5f06d296