What is CVE-2026-33317?

CVE-2026-33317 is a High severity Linux kernel vulnerability with a CVSS score of 8.7 out of 10, classified as a Out-of-bounds Read flaw (CWE-125). CVE-2026-33317 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-33317?

CVE-2026-33317 has a CVSS score of 8.7 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L.

Is there a patch available for CVE-2026-33317?

No patch is currently available for CVE-2026-33317. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2026-33317 actively exploited?

CVE-2026-33317 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Out-of-bounds Read (CWE-125)?

The product reads data past the end or before the beginning of the intended buffer. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/125.html

CVE-2026-33317

High

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.

Package Linux Kernel

Published 2026-04-24

Last modified 2026-06-05

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

8.7

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

Low

Vector string

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

Weakness type

CWE-125

CVE-2026-33317 is a Out-of-bounds Read vulnerability

What is Out-of-bounds Read?

The product reads data past the end or before the beginning of the intended buffer. Learn more on MITRE CWE

References

The following references provide additional information about CVE-2026-33317 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://github.com/OP-TEE/optee_os/commit/149e8d7ecc4ef8bb00ab4a37fd2ccede6d79e1ca
Patch
Kernel patch commit
https://github.com/OP-TEE/optee_os/commit/16926d5a46934c46e6656246b4fc18385a246900
Patch
Kernel patch commit
https://github.com/OP-TEE/optee_os/commit/e031c4e562023fd9f199e39fd2e85797e4cbdca9
Patch

4 patch commits total View all on NVD

Details

CVE ID CVE-2026-33317

Severity High

CVSS score 8.7 / 10

CVSS version 3.1

Published 2026-04-24

Modified 2026-06-05

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2026-33317?

CVE-2026-33317 is a High severity Linux kernel vulnerability with a CVSS score of 8.7 out of 10 , classified as an Out-of-bounds Read flaw (CWE-125) . CVE-2026-33317 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-33317?

CVE-2026-33317 has a CVSS score of 8.7 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L.
Is there a patch available for CVE-2026-33317?

No patch is currently available for CVE-2026-33317. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2026-33317 actively exploited?

No — CVE-2026-33317 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Out-of-bounds Read (CWE-125)?

The product reads data past the end or before the beginning of the intended buffer. View CWE-125 on MITRE CWE →