{"id":"CVE-2026-42546","summary":"OP-TEE has missing OPTEE_MSG_ATTR_TYPE_MASK in cleanup_shm_refs() leaks mobj references","details":"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.","aliases":["GHSA-c7j8-fgqw-rcgp"],"modified":"2026-10-21T02:57:50.462335215Z","published":"2026-07-06T19:31:56.172Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42546.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-770"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42546.json"},{"type":"ADVISORY","url":"https://github.com/OP-TEE/optee_os/security/advisories/GHSA-c7j8-fgqw-rcgp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42546"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/op-tee/optee_os","events":[{"introduced":"ee595e950f5be1ace3e831261c22a0e99f959046"},{"fixed":"f54190f22611dd5ad5d22546fd4209aa100f56bd"}],"database_specific":{"extracted_events":[{"strategy":"StringRangeExpression","range":[{"introduced":"3.3.0"},{"fixed":"4.11.0"}],"source":"AFFECTED_FIELD"}]}}],"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"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L"}]}