EUVD-2026-41891Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Local vector and low privileges confirmed; integrity set to High because heap corruption of TEE kernel memory constitutes a meaningful integrity violation beyond mere crash.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Heap overflow in OP-TEE's ARM Crypto Extensions SHA-3 implementation corrupts TEE kernel memory across all platforms built with CFG_CRYPTO_WITH_CE82=y (ARMv8.2+ SHA3 extensions). The off-by-one error in the accelerated SHA-3 path overwrites memory beyond the hash state buffer, potentially corrupting all TEE kernel heap memory that follows. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires three concurrent conditions: (1) the target device must have OP-TEE OS built with CFG_CRYPTO_WITH_CE82=y - this is a non-default compile-time flag requiring ARMv8.2+ hardware with SHA3 Crypto Extensions support, so it is not present on all OP-TEE deployments; (2) the attacker must have at least low-privileged code execution on the non-secure Linux side and the ability to invoke an OP-TEE Trusted Application session that exercises the SHA-3 hash path; and (3) the affected version must be in the range 3.21.0 to 4.10.x. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The official CVSS 3.1 score of 5.5 (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) captures only the availability dimension, but the described impact - corrupting 'all TEE kernel memory following the hash state' - implies meaningful integrity consequences that C:N/I:N may understate. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with low-privilege code execution on the Linux non-secure OS (e.g., via an unprivileged shell or compromised application) invokes a Trusted Application in OP-TEE that performs a SHA-3 hash operation. The off-by-one error in the ARM CE-accelerated SHA-3 path triggers a write beyond the hash state buffer, overflowing into adjacent TEE kernel heap memory and corrupting secure-world data structures, potentially crashing the TEE or enabling escalation within the secure world. … |
| Remediation | Upgrade to OP-TEE OS version 4.11.0, which contains the official patch for the off-by-one error in the SHA-3 ARM Crypto Extensions implementation. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Integer overflow in OP-TEE OS's AES-GCM implementation silently corrupts authentication tag computation when a single op
Heap exhaustion in OP-TEE OS (versions 3.3.0 through 4.10.x) allows a low-privileged normal-world local caller to progre
Stack exhaustion via unbounded recursion in the OP-TEE PKCS#11 Trusted Application allows a local low-privileged user to
RSA PKCS#1 v1.5 decryption in OP-TEE's Hisilicon HPRE hardware accelerator driver exposes a Bleichenbacher-style padding
RSA-OAEP decryption in OP-TEE OS versions 4.5.0 through 4.10.x exposes a Manger-style padding oracle via the Hisilicon H
RSA-OAEP decryption in OP-TEE OS versions 3.9.0 through 4.10.x exposes a Manger-style padding oracle via the NXP CAAM ha
Same weakness CWE-787 – Out-of-bounds Write
View allSame technique Memory Corruption
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External POC / Exploit Code
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