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DEBIAN-CVE-2026-44362

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. Starting in version 3.20.0 and prior to version 4.11.0, a vulnerability in OP-TEE’s subkey rollback protection allows the use of revoked or older subkey versions because the system fails to propagate versioning data during the Trusted Application (TA) loading process. In `core/crypto/signed_hdr.c`, the function `shdr_load_pub_key()` parses subkey headers but does not assign the `subkey_version` to the runtime `shdr_pub_key` structure. As a result, the `key->version` field remains at zero regardless of the version specified in the header. When `ree_fs_ta_open()` in `core/kernel/ree_fs_ta.c` calls `check_update_version()`, it passes this zeroed version to the rollback database. Because the database never receives a non-zero version to record, it never advances, effectively bypassing the rollback check and allowing TAs signed with downgraded subkey chains to load successfully. This impacts OP-TEE mainline configurations that utilize subkey-based signing chains for Trusted Application (TA) authentication. Version 4.11.0 contains a patch. No known workarounds are available.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-44362

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-2026-44362

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-2026-44362.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#57678 · Revision 1
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Publisher date
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