What is CVE-2026-33662?

CVE-2026-33662 is a High severity Linux kernel vulnerability with a CVSS score of 7.5 out of 10, classified as a Integer Overflow flaw (CWE-190). CVE-2026-33662 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-33662?

CVE-2026-33662 has a CVSS score of 7.5 out of 10, rated High severity. The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2026-33662?

No patch is currently available for CVE-2026-33662. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2026-33662 actively exploited?

CVE-2026-33662 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Integer Overflow (CWE-190)?

The product performs a calculation that can produce an integer overflow, leading to unexpected values. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/190.html

CVE-2026-33662

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. From 3.8.0 to 4.10, in the function emsa_pkcs1_v1_5_encode() in core/drivers/crypto/crypto_api/acipher/rsassa.c, the amount of padding needed, "PS size", is calculated by subtracting the size of the digest and other fields required for the EMA-PKCS1-v1_5 encoding from the size of the modulus of the key. By selecting a small enough modulus, this subtraction can overflow. The padding is added as a string of 0xFF bytes with a call to memset(), and an underflowed integer will cause the memset() call to overwrite until OP-TEE crashes. This only affects platforms registering RSA acceleration.

Package Linux Kernel

Published 2026-04-24

Last modified 2026-06-05

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

7.5

out of 10

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-190

CVE-2026-33662 is a Integer Overflow vulnerability

What is Integer Overflow?

The product performs a calculation that can produce an integer overflow, leading to unexpected values. Learn more on MITRE CWE

References

The following references provide additional information about CVE-2026-33662 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/security/advisories/GHSA-4cf8-v5g3-73gr
Patch

Details

CVE ID CVE-2026-33662

Severity High

CVSS score 7.5 / 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-2026-33662?

CVE-2026-33662 is a High severity Linux kernel vulnerability with a CVSS score of 7.5 out of 10 , classified as an Integer Overflow flaw (CWE-190) . CVE-2026-33662 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-33662?

CVE-2026-33662 has a CVSS score of 7.5 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2026-33662?

No patch is currently available for CVE-2026-33662. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2026-33662 actively exploited?

No — CVE-2026-33662 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Integer Overflow (CWE-190)?

The product performs a calculation that can produce an integer overflow, leading to unexpected values. View CWE-190 on MITRE CWE →