Use After Free in Op-Tee Optee OS
CVE-2026-71968
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.
Vulnerability class: Race Condition
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.001 (2.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 2.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000
Affected products
- Op-Tee Optee OS — versions 0, 8794043c4065c26a2b8b1313794ba5ba5f06d296
Weakness classification (CWE)
References
- github.com/OP-TEE/optee_os/pull/7900 (issue-tracking)
- github.com/OP-TEE/optee_os/commit/8794043c4065c26a2b8b1313794ba5ba5f06d296 (patch)
- www.vulncheck.com/advisories/op-tee-os-use-after-free-via-trusted-application-l… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-71968?
- CVE-2026-71968 is a medium-severity vulnerability in Op-Tee Optee OS, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 6.7/10. Published 2026-08-10.
- How severe is CVE-2026-71968?
- Medium severity. CVSS v3 base score is 6.7 out of 10.