Vulnerability · Published Apr 24, 2026 · Assigned by GitHub_M
CVE-2026-33317OP-TEE: PKCS#11 TA out-of-bounds read and memory disclosure
High 8.7
In plain English
A high-severity out-of-bounds read 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 0.2% (higher than 8% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | optee-os | no fix listed | DEBIAN-CVE-2026-33317 |
| Ubuntu:25.10 | optee-os | no fix listed | UBUNTU-CVE-2026-33317 |
| Ubuntu:26.04:LTS | optee-os | no fix listed | UBUNTU-CVE-2026-33317 |
| Ubuntu:26.10 | optee-os | no fix listed | UBUNTU-CVE-2026-33317 |
Affected products (as reported)
Weakness: CWE-125, CWE-787 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L
References
- https://github.com/OP-TEE/optee_os/security/advisories/GHSA-8cqw-mg7v-c9p9 x_refsource_CONFIRM
- https://github.com/OP-TEE/optee_os/commit/149e8d7ecc4ef8bb00ab4a37fd2ccede6d79e1ca x_refsource_MISC
- https://github.com/OP-TEE/optee_os/commit/16926d5a46934c46e6656246b4fc18385a246900 x_refsource_MISC
- https://github.com/OP-TEE/optee_os/commit/e031c4e562023fd9f199e39fd2e85797e4cbdca9 x_refsource_MISC