Part 2

The _updateCreditDelegations() function calculates a vault’s share of credit delegation using the formula:

However, if totalCreditDelegationWeightCache == 0, the function attempts to divide by zero, causing a revert and preventing credit delegation updates. This scenario can occur when:

1. A vault has no active credit delegations.

2. The vault’s total credit delegation weight has been reset but _updateCreditDelegations() is still called.

3. A market is removed, causing the total delegation weight to drop to zero.

Since this function plays a key role in recalculating credit allocations during vault updates, a single zero-weight scenario can halt the entire credit delegation process for the protocol.

Impact:

Credit delegation updates will fail, preventing vaults from properly redistributing credit, leading to stalled lending operations and potential financial inefficiencies across the system.

Mitigation:

Before performing division, explicitly check if totalCreditDelegationWeightCache == 0 and set creditDelegationShareX18 = UD60x18_ZERO to avoid division errors.