PatchTheCVECVE-2026-40257: OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on
CVE-2026-40257 is a medium-severity flaw (CVSS 5.5) affecting op-tee. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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_CRYPT
Why this priority
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.5 (Medium) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 0.2% (top 96%) |
| CISA exploited list | No |
| Weakness | CWE-787 |
| Published | 2026-07-06 |
| Last modified | 2026-10-25 |
Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-40257?
op-tee: upgrade to newer than 4.10.0. Exact commands for each OS are on this page.
Is CVE-2026-40257 being exploited?
CVE-2026-40257 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-40257 affect?
CVE-2026-40257 affects op-tee. Severity is medium (CVSS 5.5). 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 Extensi
How urgent is CVE-2026-40257?
Priority 25/100. On your watchlist
Software pages
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