Offchain Labs Arbitrum ArbOS 50 and 51 (Fusaka)

Findings · 6

1. 1 Outdated block gas limit used inside the block in which the ArbOS upgrade is executed Low
2. 2 Lack of checks when setting the block gas limit Informational
3. 3 Possible underflow inside the gas charging hook Medium
4. 4 GetScheduledTx out-of-bounds check ignores the case in which txId equals len(s.txs) Informational
5. 5 Call to batch.Write in headerchain does not have error checking Informational
6. 6 ARB_GAS_INFO variable is unused Informational

Findings extracted from the published report PDF. See the full report below for details and remediation.