Integrity bypass via wrapped AES-GCM length counters
Published Jul 6, 2026 · Updated Jul 6, 2026
Integer overflow in OP-TEE OS 3.0.0 through 4.10.0 allows local users to bypass AES-GCM integrity checks via oversized inputs. The ghash_update_lengths routine multiplies 32-bit byte counts by eight before GHASH, so payload or AAD lengths above 512 MiB overflow; 32-bit accumulated-length fields also wrap beyond 4 GiB. Exploitation requires a local low-privileged user to reach a TA that accepts arbitrary oversized AES-GCM operations, producing an incorrect tag that collides across lengths separated by multiples of 512 MiB.
Summary
What happened
Integer overflow in OP-TEE OS 3.0.0 through 4.10.0 allows local users to bypass AES-GCM integrity checks via oversized inputs. The ghash_update_lengths routine multiplies 32-bit byte counts by eight before GHASH, so payload or AAD lengths above 512 MiB overflow; 32-bit accumulated-length fields also wrap beyond 4 GiB. Exploitation requires a local low-privileged user to reach a TA that accepts arbitrary oversized AES-GCM operations, producing an incorrect tag that collides across lengths separated by multiples of 512 MiB.
The record
- CVE
- CVE-2026-53763
- Published
- Jul 6, 2026
- Updated
- Jul 6, 2026
- Vendor
- OP-TEE
- Product
- OP-TEE OS
- Classifications
- CWE-190
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 6, 2026CVE publishedPublication date reported by the CVE source.
- Jul 6, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 3.0.0, < 4.11.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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