pcrypt may_backlog

The pcrypt may_backlog tag covers discussions about a Linux kernel vulnerability (CVE-2026-43493) that addresses incorrect handling of asynchronous pcrypt crypto requests using the MAY_BACKLOG flag. The bug, patched across multiple stable kernel branches, involves error handling at the boundary of user-reachable crypto APIs and async callbacks. While no weaponized exploit or privilege-escalation chain has been confirmed, the issue highlights how kernel security can hinge on obscure return values. This tag is relevant for administrators and developers tracking Linux kernel security patches, particularly those involving pcrypt and async error handling.