UBUNTU-CVE-2026-40257

See a problem?
Please try reporting it to the source first.

Source

https://ubuntu.com/security/CVE-2026-40257

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40257.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-40257

Upstream

CVE-2026-40257

Published

2026-07-06T17:16:00Z

Modified

2026-07-09T17:16:16.188158555Z

Severity

5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

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. Starting in version 3.21.0 and prior to version 4.11.0, the ARM Crypto Extensions accelerated SHA-3 implementation has an off-by-one error that can cause a massive heap overflow that corrupts all TEE kernel memory following the hash state. This affects all platforms built with CFG_CRYPTO_WITH_CE82=y (ARMv8.2+ with SHA3 Crypto Extensions). Version 4.11.0 contains a patch. As a workaround, disable SHA3 Crypto Extensions with CFG_CRYPTO_WITH_CE82=n.

References

Affected packages

Ubuntu:25.10 / optee-os

Package

Name: optee-os
Purl: pkg:deb/ubuntu/optee-os?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.5.0-1

4.5.0-2

4.7.0-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "optee-os",
            "binary_version": "4.7.0-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40257.json"

Ubuntu:26.04:LTS / optee-os