{"schemaVersion":3,"id":"CVE-2026-53763","aliases":["UBUNTU-CVE-2026-53763","DEBIAN-CVE-2026-53763"],"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 3.0.0 and prior to version 4.11.0, 32-bit integer overflows in OP-TEE core's AES-GCM implementation cause the authentication tag to be computed with incorrect bit-length values after processing more than 512 megabytes of payload or Additional Authenticated Data (AAD). Version 4.11.0 contains a patch. No known workarounds are available.","dates":{"published":"2026-07-06T19:35:39.800Z","modified":"2026-07-07T14:10:54.311Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":3.8,"severity":"low","version":"3.0","versionLabel":"v3.0","source":"CVE.org","vector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.0","versionLabel":"v3.0","source":"CVE.org","score":3.8,"severity":"low","vector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.0","versionLabel":"v3.0","source":"OSV · Ubuntu","score":3.8,"severity":"low","vector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N","exploitability":5.1,"impact":2.3,"computed":true},{"version":"3.0","versionLabel":"v3.0","source":"OSV · 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Overflow or Wraparound","description":"The product performs a calculation that can\n         produce an integer overflow or wraparound when the logic\n         assumes that the resulting value will always be larger than\n         the original value. This occurs when an integer value is\n         incremented to a value that is too large to store in the\n         associated representation. When this occurs, the value may\n         become a very small or negative number.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/190.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":"≥ 3.0.0, < 4.11.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.0.0, < 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":"≥ 3.0.0, ≤ 4.10.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.0.0, ≤ 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-fcm8-vjhf-6vqh","label":"github.com/OP-TEE/optee_os/security/advisories/GHSA-fcm8-vjhf-6vqh","hostname":"github.com","tags":["X Refsource CONFIRM","REPORT","Vendor Advisory","Patch"]},{"url":"https://ubuntu.com/security/CVE-2026-53763","label":"ubuntu.com/security/CVE-2026-53763","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53763","label":"www.cve.org/CVERecord?id=CVE-2026-53763","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-53763","label":"security-tracker.debian.org/tracker/CVE-2026-53763","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-07-06T19:35:39.800Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-07-07T14:10:54.311Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":15,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T09:27:01.822Z","stale":false,"partial":false}}