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Vulnerability record · CVE-2026-33317 · published 24 April 2026

CVE-2026-33317: Trustedfirmware op-tee out-of-bounds read vulnerability

Trustedfirmware · Op Tee

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.

8.7 CVSS 3.1 High EPSS 0.19% · top 92.3% CWE-125 · Out-of-bounds readCWE-787 · Out-of-bounds write
8.7CVSS 3.1 base score
0.19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/OP-TEE/optee_os/commit/149e8d7ecc4ef8bb00ab4a37fd2ccede6d79e1ca Patch
https://github.com/OP-TEE/optee_os/commit/16926d5a46934c46e6656246b4fc18385a246900 Patch
https://github.com/OP-TEE/optee_os/commit/e031c4e562023fd9f199e39fd2e85797e4cbdca9 Patch
https://github.com/OP-TEE/optee_os/security/advisories/GHSA-8cqw-mg7v-c9p9 ExploitPatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2019-1010292Trustedfirmware op-tee out-of-bounds write vulnerabilityLinaro/OP-TEE OP-TEE Prior to version v3.4.0 is affected by: Boundary checks. The impact is: This could lead to corruption of any memory which the TA…EPSS 1.6%9.8CVE-2019-1010293Trustedfirmware op-tee out-of-bounds write vulnerabilityLinaro/OP-TEE OP-TEE 3.3.0 and earlier is affected by: Boundary crossing. The impact is: Memory corruption of the TEE itself. The component is: optee…EPSS 1.6%9.8CVE-2019-1010295Trustedfirmware op-tee improper input validation vulnerabilityLinaro/OP-TEE OP-TEE 3.3.0 and earlier is affected by: Buffer Overflow. The impact is: Memory corruption and disclosure of memory content. The compon…EPSS 1.6%9.8CVE-2019-1010296Trustedfirmware op-tee integer overflow vulnerabilityLinaro/OP-TEE OP-TEE 3.3.0 and earlier is affected by: Buffer Overflow. The impact is: Code execution in context of TEE core (kernel). The component …EPSS 2.8%9.8CVE-2019-1010297Trustedfirmware op-tee integer overflow vulnerabilityLinaro/OP-TEE OP-TEE 3.3.0 and earlier is affected by: Buffer Overflow. The impact is: Execution of code in TEE core (kernel) context. The component …EPSS 2.7%9.8CVE-2019-1010298Trustedfirmware op-tee integer overflow vulnerabilityLinaro/OP-TEE OP-TEE 3.3.0 and earlier is affected by: Buffer Overflow. The impact is: Code execution in the context of TEE core (kernel). The compon…EPSS 3.9%9.1CVE-2019-25052Trustedfirmware op-tee broken cryptographic algorithm vulnerabilityIn Linaro OP-TEE before 3.7.0, by using inconsistent or malformed data, it is possible to call update and final cryptographic functions directly, cau…EPSS 0.87%8.8CVE-2022-46152Trustedfirmware op-tee vulnerabilityOP-TEE Trusted OS is the secure side implementation of OP-TEE project, a Trusted Execution Environment. Versions prior to 3.19.0, contain an Improper…EPSS 0.49%

Source: NIST National Vulnerability Database (record CVE-2026-33317), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.