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DEBIAN-CVE-2026-33662

Type: advisorySource: OSV1 source record

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. From 3.8.0 to 4.10, in the function emsa_pkcs1_v1_5_encode() in core/drivers/crypto/crypto_api/acipher/rsassa.c, the amount of padding needed, "PS size", is calculated by subtracting the size of the digest and other fields required for the EMA-PKCS1-v1_5 encoding from the size of the modulus of the key. By selecting a small enough modulus, this subtraction can overflow. The padding is added as a string of 0xFF bytes with a call to memset(), and an underflowed integer will cause the memset() call to overwrite until OP-TEE crashes. This only affects platforms registering RSA acceleration.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-33662

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-33662

optee-os

Source reference: /affected/0/package/name

Affected versions
4.10.0-1

Source reference: /affected/0/versions

4.10.0-2

Source reference: /affected/0/versions

4.5.0-2

Source reference: /affected/0/versions

4.7.0-1

Source reference: /affected/0/versions

4.8.0-1

Source reference: /affected/0/versions

4.9.0-1

Source reference: /affected/0/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "optee-os",
      "purl": "pkg:deb/debian/optee-os?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "4.10.0-1",
      "4.10.0-2",
      "4.5.0-2",
      "4.7.0-1",
      "4.8.0-1",
      "4.9.0-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33662.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56374 · Revision 1
Added to Heist Feed
Publisher date
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