Bug 2497397 (CVE-2026-40257) - CVE-2026-40257 optee: OP-TEE: Memory corruption due to heap overflow in ARM Crypto Extensions SHA-3 implementation
Summary: CVE-2026-40257 optee: OP-TEE: Memory corruption due to heap overflow in ARM C...
Keywords:
Status: NEW
Alias: CVE-2026-40257
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2497695
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-06 17:01 UTC by OSIDB Bzimport
Modified: 2026-07-07 12:31 UTC (History)
0 users

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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`.
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