{"id":"UBUNTU-CVE-2026-40257","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`.","modified":"2026-07-09T17:16:16.188158555Z","published":"2026-07-06T17:16:00Z","upstream":["CVE-2026-40257"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-40257"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-40257"},{"type":"REPORT","url":"https://github.com/OP-TEE/optee_os/security/advisories/GHSA-75x4-j8p9-55qv"}],"affected":[{"package":{"name":"optee-os","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/optee-os?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.5.0-1","4.5.0-2","4.7.0-1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.7.0-1","binary_name":"optee-os"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40257.json"}},{"package":{"name":"optee-os","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/optee-os?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.7.0-1","4.8.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"optee-os","binary_version":"4.8.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40257.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}