{"schemaVersion":3,"id":"CVE-2026-40290","aliases":["UBUNTU-CVE-2026-40290","DEBIAN-CVE-2026-40290"],"status":"published","duplicateOf":null,"title":null,"description":"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 3.16.0 and prior to 4.11.0, a user-after-free (UAF) race condition exists in the shared memory teardown logic of FF-A  within OP-TEE SPMC/SP flows. This only applies when OP-TEE is configured as an SPMC for S-EL0 SPs, that is, with `CFG_SECURE_PARTITION=y`. The function `sp_mem_remove()`, responsible for freeing entries in `smem->receivers` and `smem->regions`, fails to acquire the global `sp_mem_lock` before performing the `free()` operations. Concurrently, other code paths, such as `sp_mem_get_receiver()`, iterate over these same lists without holding a lock, or, like `sp_mem_is_shared()`, iterate while holding the lock but are not serialized against the unprotected `free()` in `sp_mem_remove()`. This creates a cross-thread race where a thread iterating the list can acquire a pointer to an entry (e.g., `struct sp_mem_map_region` or `struct sp_mem_receiver`), and then another thread calls `sp_mem_remove()`, freeing the object. When the first thread resumes and dereferences the pointer, it results in a Use-After-Free vulnerability. Version 4.11.0 fixes the issue.","dates":{"published":"2026-06-03T16:45:51.204Z","modified":"2026-06-04T14:18:01.010Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.8,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":7.8,"severity":"high","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":7.8,"severity":"high","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","exploitability":4.6,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · 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At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory \"belongs\" to the code that operates on the new pointer.","type":"weakness","status":"Stable","abstraction":"Variant","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/416.html"}],"affected":[{"vendor":"debian","product":"optee-os","name":"optee-os","label":"optee-os","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/optee-os","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"optee-os","name":"optee-os","label":"optee-os","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/optee-os","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"op-tee","product":"optee_os","name":"optee_os","label":"optee_os","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.16.0, < 4.11.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.16.0, < 4.11.0","eol":null,"hubHref":"/vendor/op-tee/optee_os"},{"vendor":"trustedfirmware","product":"op-tee","name":"op-tee","label":"op-tee","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ 3.16.0, ≤ 4.10.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.16.0, ≤ 4.10.0","eol":null,"hubHref":"/vendor/trustedfirmware/op-tee"}],"affectedCount":4,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/OP-TEE/optee_os/security/advisories/GHSA-332c-xr93-849m","label":"github.com/OP-TEE/optee_os/security/advisories/GHSA-332c-xr93-849m","hostname":"github.com","tags":["X Refsource CONFIRM","REPORT","Exploit","Mitigation","Vendor Advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-40290","label":"ubuntu.com/security/CVE-2026-40290","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-40290","label":"www.cve.org/CVERecord?id=CVE-2026-40290","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-40290","label":"security-tracker.debian.org/tracker/CVE-2026-40290","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-06-03T16:45:51.204Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-06-04T14:18:01.010Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":41,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T19:12:18.326Z","stale":false,"partial":false}}