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CVE-2021-47412 is a Linux kernel block-layer lifetime-management flaw in the request-queue QoS completion path. The kernel could invoke rq_qos_ops->done_bio for a bio that was not tracked by the rq_qos framework, including bios used by bio-based drivers or bios completed from error-handling paths. In these cases, the bio completion path can derive a request queue without holding a queue reference, while the queue's rq_qos state may already have been released during queue cleanup. Calling the completion callback can therefore dereference freed queue QoS state and panic the kernel. The fix suppresses rq_qos done_bio processing for untracked bios.
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Linux kernel block-layer request QoS handling flaw.
A Linux kernel block-layer vulnerability involving invocation of rq_qos_ops->done_bio for a bio that is not tracked. The issue was resolved upstream and is classified as medium severity in the referenced Red Hat tracking record.
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