CVE Explorer
CVE-2026-40257
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 Extensio
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"optee_os","vendor":"OP-TEE","versions":[{"status":"affected","version":">= 3.21.0, < 4.11.0"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:eaa6480036489e754816219b903c0f371b3caadc3be17e2519f9648bc4ddc260 · sha256:079d3d3bfe3ed566… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":5.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:eaa6480036489e754816219b903c0f371b3caadc3be17e2519f9648bc4ddc260 · sha256:079d3d3bfe3ed566… · /containers/cna/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-787","description":"CWE-787: Out-of-bounds Write","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:eaa6480036489e754816219b903c0f371b3caadc3be17e2519f9648bc4ddc260 · sha256:079d3d3bfe3ed566… · /containers/cna/problemTypes/0/descriptions/0
Source references
1 source assertion{"name":"https://github.com/OP-TEE/optee_os/security/advisories/GHSA-75x4-j8p9-55qv","tags":["x_refsource_CONFIRM"],"url":"https://github.com/OP-TEE/optee_os/security/advisories/GHSA-75x4-j8p9-55qv"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:eaa6480036489e754816219b903c0f371b3caadc3be17e2519f9648bc4ddc260 · sha256:079d3d3bfe3ed566… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.