OP-TEE: PKCS#11 TA out-of-bounds read and memory disclosure_CVE-2026-33317

8.7 / 10

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

Description

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 `entry_get_attribute_value()` 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 `PKCS11_CMD_GET_ATTRIBUTE_VALUE` or `entry_get_attribute_value()` 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.

AI Analysis

Out-of-bounds read and memory disclosure in OP-TEE PKCS#11 TA due to missing checks in `entry_get_attribute_value()` function

Basic Information

ID CVE-2026-33317

Source GitHub_M

Published Apr 24, 2026 at 02:20

Affected Product

Vendor OP-TEE

Product optee_os

Version >= 3.13.0, <= 4.10.0

Affected Versions OP-TEE optee_os >= 3.13.0, <= 4.10.0

CWE Classification

CWE-125 CWE-787

AI Assessment

AI Score 8.7 / 10

AI Severity High

Vendor OP-TEE

Product OP-TEE optee_os

Version 3.13.0 to 4.10.0

References

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    "lastseen": "",
    "description": "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 `entry_get_attribute_value()`  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 `PKCS11_CMD_GET_ATTRIBUTE_VALUE`  or `entry_get_attribute_value()` 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.",
    "published": "2026-04-24T02:20:55.670Z",
    "modified": "2026-04-24T02:20:55.670Z",
    "type": "cve",
    "title": "OP-TEE: PKCS#11 TA out-of-bounds read and memory disclosure",
    "source": "GitHub_M",
    "references": "https://github.com/OP-TEE/optee_os/security/advisories/GHSA-8cqw-mg7v-c9p9\nhttps://github.com/OP-TEE/optee_os/commit/149e8d7ecc4ef8bb00ab4a37fd2ccede6d79e1ca\nhttps://github.com/OP-TEE/optee_os/commit/16926d5a46934c46e6656246b4fc18385a246900\nhttps://github.com/OP-TEE/optee_os/commit/e031c4e562023fd9f199e39fd2e85797e4cbdca9",
    "id": "CVE-2026-33317",
    "bulletinFamily": "",
    "cwe": [
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    "cvelist": null,
    "sourceData": "OP-TEE optee_os >= 3.13.0, <= 4.10.0",
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    "cvss": {
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        "version": "3.1"
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    "product": "optee_os",
    "version": ">= 3.13.0, <= 4.10.0",
    "vendor": "OP-TEE",
    "ai_description": "Out-of-bounds read and memory disclosure in OP-TEE PKCS#11 TA due to missing checks in `entry_get_attribute_value()` function",
    "ai_severity": "High",
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