Vulnerability · Published Aug 10, 2026 · Assigned by VulnCheck

CVE-2026-71968OP-TEE OS 4.10.0 Use-After-Free via Trusted Application Loader TA_FLAG_CONCURRENT

Medium 6.7

In plain English

A medium-severity use-after-free 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 0.1% (higher than 3% of all known vulnerabilities).

Severity (CVSS 3.1)6.7Medium

Exploit odds (30 days)0.1%top 97.0% 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 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:13	optee-os	no fix listed	DEBIAN-CVE-2026-71968
Ubuntu:26.04:LTS	optee-os	no fix listed	UBUNTU-CVE-2026-71968
Ubuntu:26.10	optee-os	no fix listed	UBUNTU-CVE-2026-71968

Affected products (as reported)

Vendor	Product	Versions
OP-TEE	optee_os	0 – through 4.10.0

Weakness: CWE-416, CWE-362 · Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

References

Pull Request issue-tracking
Patch Commit patch
https://www.vulncheck.com/advisories/op-tee-os-use-after-free-via-trusted-application-loader-ta-flag-concurrent third-party-advisory