OP-TEE has missing OPTEE_MSG_ATTR_TYPE_MASK in cleanup_shm_refs() leaks mobj references

{
  "id": "9d5c575e513f66cae5d50e11ce3a5169eccc6e90d5659e7e205f28d388395e0c",
  "url": "https://osv.dev/vulnerability/CVE-2026-42546",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "OP-TEE has missing OPTEE_MSG_ATTR_TYPE_MASK in cleanup_shm_refs() leaks mobj references",
    "summary": "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 3.3.0 and prior to version 4.11.0, a resource leak exists in OP-TEE’s shared memory cleanup logic because the function `cleanup_shm_refs()` in `core/tee/entry_std.c` fails to apply a required bitmask (`OPTEE_MSG_ATTR_TYPE_MASK`) to parameter attributes. When processing non-contiguous memory parameters from a normal-world caller, the system fails to match the attribute type in its internal switch statement and skips the necessary mobj_put() call. This results in a persistent reference leak of `mobj_reg_shm` objects, which remain on internal lists with dangling refcounts. This affects non-FF-A configurations that support non-contiguous, non-secure shared memory. Over time, these accumulated leaks progressively consume the secure-world heap, degrading the system's ability to service trusted application operations and eventually requiring a reboot to recover. Version 4.11.0 contains a patch. No known workarounds are available.",
    "evidence": "osv:CVE-2026-42546",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2026-42546",
      "aliases": [
        "CVE-2026-42546",
        "GHSA-c7j8-fgqw-rcgp"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/op-tee/optee_os",
              "type": "GIT",
              "events": [
                {
                  "introduced": "ee595e950f5be1ace3e831261c22a0e99f959046"
                },
                {
                  "fixed": "f54190f22611dd5ad5d22546fd4209aa100f56bd"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "3.3.0"
                      },
                      {
                        "fixed": "4.11.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  }
                ]
              }
            }
          ],
          "versions": [
            "4.11.0-rc1",
            "4.10.0",
            "4.10.0-rc1",
            "4.9.0",
            "4.9.0-rc1",
            "4.8.0",
            "4.8.0-rc1",
            "4.7.0",
            "4.7.0-rc1",
            "4.6.0",
            "4.6.0-rc1",
            "4.5.0",
            "4.5.0-rc1",
            "4.4.0",
            "4.4.0-rc1",
            "4.3.0",
            "4.3.0-rc1",
            "4.2.0",
            "4.2.0-rc1",
            "4.1.0",
            "4.1.0-rc1",
            "4.0.0",
            "4.0.0-rc1",
            "3.22.0",
            "3.22.0-rc1",
            "3.21.0",
            "3.21.0-rc1",
            "3.20.0",
            "3.20.0-rc1",
            "3.19.0",
            "3.19.0-rc1",
            "3.18.0",
            "3.18.0-rc1",
            "3.17.0",
            "3.17.0-rc1",
            "3.16.0",
            "3.15.0",
            "3.15.0-rc1",
            "3.14.0",
            "3.14.0-rc1",
            "3.13.0",
            "3.13.0-rc1",
            "3.12.0",
            "3.12.0-rc1",
            "3.11.0",
            "3.11.0-rc1",
            "3.10.0",
            "3.10.0-rc1",
            "3.9.0",
            "3.9.0-rc1",
            "3.8.0",
            "3.8.0-rc1",
            "3.7.0",
            "3.7.0-rc1",
            "3.6.0",
            "3.6.0-rc1",
            "3.5.0",
            "3.5.0-rc1",
            "3.4.0",
            "3.4.0-rc1",
            "3.3.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42546.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:21.996521872Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42546.json",
        "https://github.com/OP-TEE/optee_os/security/advisories/GHSA-c7j8-fgqw-rcgp",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-42546"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-770"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42546.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-42546",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 488312,
  "published_at": "2026-07-06T19:31:56.172+00:00"
}