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Vulnerability record · CVE-2026-71968 · published 10 August 2026

CVE-2026-71968: Race condition vulnerability

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.

8.4 CVSS 4.0 High EPSS 0.14% · top 97.5% CWE-362 · Race conditionCWE-416 · Use after free Awaiting Analysis
8.4CVSS 4.0 base score
0.14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
24 Sep 2026Last modified by NVD

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.

CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/OP-TEE/optee_os/commit/8794043c4065c26a2b8b1313794ba5ba5f06d296
https://github.com/OP-TEE/optee_os/pull/7900
https://www.vulncheck.com/advisories/op-tee-os-use-after-free-via-trusted-application-loader-ta-flag-concurrent

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Source: NIST National Vulnerability Database (record CVE-2026-71968), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.