CVE-2026-33317: OP-TEE: PKCS#11 TA out-of-bounds read and memory disclosure
OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on Arm; Cortex-A cores using the TrustZone technology. In versions 3.13.0 through 4.10.0, missing checks in entrygetattributevalue() in ta/pkcs11/src/object.c can lead to out-of-bounds read from the PKCS#11 TA heap or a crash. When chained with the OOB read, the PKCS#11 TA function PKCS11CMDGETATTRIBUTEVALUE or entrygetattributevalue() can, with a bad template parameter, be tricked into reading at most 7 bytes beyond the end of the template buffer and writing beyond the end of the template buffer with the content of an attribute value of a PKCS#11 object. Commits e031c4e562023fd9f199e39fd2e85797e4cbdca9, 16926d5a46934c46e6656246b4fc18385a246900, and 149e8d7ecc4ef8bb00ab4a37fd2ccede6d79e1ca contain patches and are anticipated to be part of version 4.11.0.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-33317?
CVE-2026-33317 has been classified with a high severity due to the potential for out-of-bounds read and memory disclosure.
How do I fix CVE-2026-33317?
To fix CVE-2026-33317, update OP-TEE to a version later than 4.10.0, which contains the necessary security patches.
What are the affected versions for CVE-2026-33317?
CVE-2026-33317 affects OP-TEE versions from 3.13.0 up to and including 4.10.0.
What type of vulnerability is CVE-2026-33317?
CVE-2026-33317 is categorized as an out-of-bounds read vulnerability that could lead to memory disclosure.
Is CVE-2026-33317 specific to certain hardware?
CVE-2026-33317 is specific to Arm Cortex-A cores utilizing the TrustZone technology in the OP-TEE environment.