Bug 2497397 (CVE-2026-40257)

Summary:	CVE-2026-40257 optee: OP-TEE: Memory corruption due to heap overflow in ARM Crypto Extensions SHA-3 implementation
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in OP-TEE (Trusted Execution Environment). An off-by-one error in the ARM Crypto Extensions accelerated SHA-3 implementation can lead to a massive heap overflow. This vulnerability allows for the corruption of all TEE kernel memory, potentially impacting the integrity and availability of the system. This affects platforms utilizing ARMv8.2+ with SHA3 Crypto Extensions.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
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Bug Depends On:	2497695
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Description OSIDB Bzimport 2026-07-06 17:01:36 UTC

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`.