fix(qcnl): fix integer overflow in write_callback() on Linux

F-INTEL-SGX-DCAP-QCNL-OVERFLOW-001

Public snapshot: 26 Sep 2026. Status, releases and attribution belong to each source below; none is inferred from another record.

Recorded evidence

—score not recorded

intel/confidential-computing.tee.dcapReported fixintel/confidential-computing.tee.dcap

fix(qcnl): fix integer overflow in write_callback() on Linux

fixed publicly

details

Finding IDs: F-INTEL-SGX-DCAP-QCNL-OVERFLOW-001
Status: fixed publicly
Reported via: security contact
Note: public fix commit 393cbd9e3cf6 landed on 2026-04-28 and shipped in Intel SGX/TDX DCAP 1.26, published on 2026-04-30. the Linux QCNL write_callback path changes integer arithmetic and adds a bounded buffer-growth guard.

F-INTEL-SGX-DCAP-QCNL-OVERFLOW-001: Memory safety. QCNL buffer growth uses overflowing integer arithmetic. Reviewed 24 Sep 2026. Mechanism assessed by 1seal.

Mechanism source for F-INTEL-SGX-DCAP-QCNL-OVERFLOW-001

Security area (1seal assessment): Memory safety. QCNL uses checked size arithmetic before growing and copying response buffers, preventing integer overflow at the allocation boundary. Reviewed 21 Sep 2026.

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